ЦЕНТРОБЕЖНЫЙ КОМПРЕССОРНЫЙ АГРЕГАТ

Изобретение относится к области компрессоростроения, преимущественно к герметичным осевым и центробежным компрессорам со встроенным высокооборотным электроприводом без смазки в опорах ротора. Центробежный компрессорный агрегат содержит электродвигатель, имеющий статор и ротор с валом, установленным на подшипниках, и узел сжатия, включающий лопатки, при этом упомянутые узлы расположены в герметичном корпусе, причем статор электродвигателя установлен внутри охватывающего его полого ротора электродвигателя, выполненного с лопатками и образующего роторную часть узла сжатия, статорная часть которого расположена на герметичном корпусе и выполнена в виде лопаток, закрепленных на герметичном корпусе. Техническим результатом изобретения является повышение эксплуатационной надежности герметичного компрессорного агрегата, снижение эксплуатационных затрат, снижение объемов работ при техобслуживании и ремонте, уменьшение числа контролируемых параметров, уменьшение массогабаритных характеристик. 2 з.п ...

УСТРОЙСТВО ДЛЯ ПЕРЕКАЧКИ ОДНОФАЗНЫХ ИЛИ МНОГОФАЗНЫХ ЖИДКОСТЕЙ БЕЗ ИЗМЕНЕНИЯ ИХ СВОЙСТВ

... 1. Устройство для перекачки однофазных или многофазных жидкостей без изменения их свойств, состоящее из трубчатого полого корпуса (1), направляющего жидкость преимущественно вдоль оси, в котором имеется нагнетательный элемент (5), приводимый во вращательное движение статором (31) мотора, размещенным с наружной стороны полого корпуса (1), при этом нагнетательный элемент (5) ориентирован вдоль оси, в котором жидкость может перетекать через роторный зазор (8) между нагнетательным элементом (5) и полым корпусом (1), и в котором по одному направляющему блоку (7, 7’, 75) установлено спереди и позади нагнетательного элемента (5) соответственно, отличающееся тем, что нагнетательный элемент (5) подвешен бесконтактным способом между направляющими блоками (7, 7’, 75), каждый из которых разделен зазором (9) вкладыша, посредством элементов (41, 42) магнитной подвески, размещенных в направляющих блоках (7, 7’, 75) и в нагнетательном элементе (5), которые функционально работают вместе, а их лицевые магнитовзаимодействующие ...

Emergency roller bearing

The emergency roller bearing assembly has at least one unit as a single- or double-race ball bearing with a one- or two-piece race ring (10,11). The balls (12) are of a ceramic material and the race rings (10,11) are of a high alloy chrome steel with resistance to corrosion. The bearing structure is flanked by cover discs (13) to form the two-part race ring into a single component. The bearing has a dry lubricant and/or the race rings (10,11) have a hard cladding.

KREISELPUMPE MIT INTEGRIERTEM MOTOR.

MAGNETLAGER UND VAKUUMPUMPE

CAMP FOR ELECTROMAGNETIC SUSPENSION

FLOATING CAMP UTILIZATION OF PUMPODER MIXTURE SYSTEM

ZENTRIFUGALPUMPE BESTEHEND AUS EINEM PUMPENKOPF UND EINEM SCHEIBENLÄUFERANTRIEB ZUR FÖRDERUNG VON BLUT UND ANDEREN SCHEREMPFINDLICHEN FLÜSSIGKEITEN

FLUID PUMP WITH MAGNETICALLY HUNG UP IMPELLER

LINEAR MOTOR COMPRESSOR AND ITS APPLICATION IN A COOLING DEVICE

DEVICE FOR THE AXIAL PROMOTION OF LIQUIDS

MAGNETICALLY HANGING UP PUMP WITH MAGNETIC BEARING DEVICES

HYDRAULIC PUMP WITH MAGNETICALLY HUNG UP IMPELLER

Vertical pump

FLUID PUMP WITH LEVITATED IMPELLER

Blood pump

Linear motor compressor and its application in cooling syste m

Systems using a levitating, rotating pumping or mixing element and related methods

Rotary blood pump

Sealless rotary blood pump with passive magnetic radial bearings and blood immersed axial bearings

METHOD FOR CONTROLLING THE POSITION OF A PERMANENT MAGNETICALLY SUPPORTED ROTATING COMPONENT

Since disruptive forces can be continuously exerted upon a rotor during a pulsatile flow through a pump with a magnetically mounted rotor (permanent magnets and addition control current coils), it is necessary to adjust position i.e modify axial rotor position very quickly. The control current should only result in small amounts of losses. According to the invention, the current is pulse-width modulated by the control current coils by means of a set value predetermined by a controller which is arranged downstream from a position sensing system. If the set value is high, it is switched to a higher voltage level and the real value of the position sensing system is stored for a defined period of time, respectively beginning with the switching flank of the control current, and the position sensing system is disconnected during said period of time.

PUMPING OR MIXING SYSTEM USING A LEVITATING BEARING

A system (10) for pumping or mixing a fluid using a levitating, rotating magnetic bearing (14) and various other components for use in a pumping or mixing system are disclosed. The magnetic bearing (14) is placed in a fluid- containing vessel (16) in close proximity to a superconducting element (16). A separate cooling source (24) thermally linked to the superconducting element provides the necessary cooling to induce levitation in the magnetic bearing. The superconducting element (20) may be thermally isolated, such that the bearing, the vessel, and any fluid contained therein are not exposed to the cold temperatures required to produce the desired superconductive effects and the resulting levitation. By using means external to the vessel to rotate and/or stabilize the magnetic bearing levitation in the fluid, including possibly rotating the superconducting element itself or moving it relative to the vessel, the desired effective pumping or mixing action may be provided.

PUMPING OR MIXING SYSTEM USING A LEVITATING BEARING

A system (10) for pumping or mixing a fluid using a levitating, rotating magnetic bearing (14) and various other components for use in a pumping or mixing system are disclosed. The magnetic bearing (14) is placed in a fluid- containing vessel (16) in close proximity to a superconducting element (16). A separate cooling source (24) thermally linked to the superconducting element provides the necessary cooling to induce levitation in the magnetic bearing. The superconducting element (20) may be thermally isolated, such that the bearing, the vessel, and any fluid contained therein are not exposed to the cold temperatures required to produce the desired superconductive effects and the resulting levitation. By using means external to the vessel to rotate and/or stabilize the magnetic bearing levitation in the fluid, including possibly rotating the superconducting element itself or moving it relative to the vessel, the desired effective pumping or mixing action may be provided.

PUMP

INTEGRATED CENTRIFUGAL PUMP AND MOTOR

... 2092438 9206301 PCTABS00011 An integrated centrifugal pump and motor is provided by an impeller disk which contains permanent magnets and functions as the rotor for a brushless DC motor. The rotor is supported by non-contacting radial bearings and is hydrodynamically balanced against any axial thrust so that there is no contact between rotating and stationary elements during operation. Since the impeller disk is also the motor rotor, there is no need for a shaft, in the ordinary sense, which would penetrate the case and, thus, require seals. The resulting pump is compact and can be operated electronically at variable speeds.

HYBRID MAGNETICALLY SUSPENDED AND ROTATED CENTRIFUGAL PUMPING APPARATUS AND METHOD

An apparatus and method for a centrifugal pump (10) for pumping sensitive biologic fluid, which includes (i) an integral impeller and rotor (21) which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings (52, 54) and rotated by an integral motor (40), (ii) a pump housing and arcuate passages (32, 34, 36) for fluid flow and containment, (iii) a brushless driving motor (40) embedded and integral with the pump housing, (iv) a power supply, and (v) specific electronic sensing of impeller position, velocity or acceleration using a self-sensing method and physiological control algorithm for motor speed and pump performance based upon input from the electromagnetic bearing currents and motor back emf -- all fitly joined together to provide efficient, durable and low maintenance pump operation. A specially designed impeller and pump housing provide the mechanism for transport and delivery of fluid through the pump to a pump output port with reduced ...

Dispositif de centrage du rotor d'une machine tournante

POMPE DE CIRCULATION AVEC ROTOR A PALIERS MAGNETIQUES

A.POMPE DE CIRCULATION AVEC ROTOR A PALIERS MAGNETIQUES; B.POMPE CARACTERISEE PAR LA COMBINAISON DES MOYENS SUIVANTS: -LA SURFACE PERIPHERIQUE DE L'INDUIT 16 EST CYLINDRIQUE; -LES DEUX POINTS D'APPUI 17 SONT FORMES CHACUN PAR UN AIMANT PERMANENT RELIE A L'INDUIT 16 ET CONSTITUE SOUS FORME DE CORPS DE REVOLUTION ENTOURE D'UN AIMANT PERMANENT FIXE CONSTITUE EGALEMENT SOUS FORME DE CORPS DE REVOLUTION, EN LAISSANT DU MOINS APPROXIMATIVEMENT UN ENTREFER RADIAL CONSTANT; -LES DEUX AIMANTS PERMANENTS FAISANT PARTIE D'UN POINT D'APPUI 13 SONT POLARISES EN DIRECTION RADIALE ET SE SITUENT EN OPPOSITION PAR DES SURFACES POLAIRES CORRESPONDANTES; C.L'INVENTION S'APPLIQUE AUX POMPES POUR EAU POTABLE DE FAIBLE PUISSANCE.

ROTARY PUMP HAS ROTOR IMMERSES

PUMP HAS PLANTABLE BLOOD

L'invention concerne une pompe à sang pour assistance cardiaque. Elle comporte un stator (1) et un rotor (2) qui sont supportés magnétiquement de façon à former un entrefer de suspension avec le stator. Le rotor comporte un organe d'impulsion (10) qui établit un espace axial par rapport au corps de volute (4) du stator au moyen d'un trajet d'écoulement de sang rétrograde. La pompe à sang peut également comporter un régulateur de position axiale amenant le palier axial à régler la position du rotor. Domaine d'application : pompes d'assistance cardiaque, etc.

TURBO COMPRESSOR

MAGNETIC BEARING TYPE VACUUM PUMP

MINI-TYPE PUMP

A mini-type pump, comprising a casing body (1), a rotor system (2), and a stator system (3), the casing body (1) having a stator cavity (122) and a rotor cavity that are not in communication, the stator system (3) being arranged inside the stator cavity (122), the rotor system (2) being arranged inside the rotor cavity, and the rotor system (2) rotating relative to the stator system (3); the rotor system (2) has a rotor component (21) and a bearing component (22), the bearing component (22) is installed within the rotor cavity, and the rotor component (21) is installed on the bearing component (22) and rotates with the bearing component (22); the bearing component (22) has a bearing (221) and a bearing shaft (222), the bearing shaft (222) is fixed to the bottom of the rotor cavity, and the bearing (221) is sleeved on the bearing shaft (222), a gap being present between the bearing (221) and the bearing shaft (222); the bottom face of the bearing (221) is oriented toward the bottom of the ...

ROTOR BEARING SYSTEM

The invention relates to a rotor bearing system (1). Said system comprises a housing (80) in which a first permanent magnet (30) is mounted such that it can rotate about a first axis (105). A rotor (70) for conveying a liquid comprises a second permanent magnet (40) in the form of a hollow cylinder, which can be mounted such that it rotates about a second axis. The first permanent magnet (30) and the second permanent magnet (40) at least partially axially overlap, the first permanent magnet (30) being arranged such that it is staggered in relation to the second permanent magnet (40). In the axial overlapping region (160) of the first permanent magnet (30) and the second permanent magnet (40), the housing (80) is located between the two permanent magnets (30, 40). A first bearing (20) is designed for the relative axial positioning of the rotor (70) and the housing (80) in relation to each other and the absorption of an axial force resulting from the arrangement of the first permanent magnet ...

Magnetically suspended and rotated rotor

The impellor of a blood pump is supported by permanent magnets on the impellor and pump housing and stabilized by an electromagnet on the housing. A control circuit supplies current to the electromagnet to maintain the axial position of the impellor at a control position in which the impellor is in mechanical equilibrium under permanent magnet forces and static axial forces on the impellor to minimize energy consumption in the support of the impellor. The impellor is rotated magnetically and stator coils in the housing are supplied with electric currents having a frequency and amplitude adjusted in relation to blood pressure at the pump inlet to match the flow characteristics of the pump to physiological characteristics of the natural heart. A cavity is formed in the impellor to match the average specific gravity of the impellor and portions of the suspension and drive systems thereon to the specific gravity of blood to further minimize power consumption by the pump. A valve member can ...

Cooling fan with balance structure

A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom; the central tube has a bottom, annular protrusion (31). A bearing (61) is received in the central tube and mounted on the protrusion. A stator (20) is mounted around the central tube. A rotor (10) includes a shaft (18) having a free end (186) extending through the bearing and defining a notch (184) therein. A locking washer (63) engages into the notch of the shaft to limit movement of the shaft along an axial direction thereof. A balance structure (62) is arranged between the locking washer and the bearing. The balance structure is made of magnet and exerts a downwardly pulling force on the shaft to prevent the rotor from moving upwardly when the rotor is rotated.

Active magnetic rotor-bearing assembly having an even number of electromagnetic units with a salient connected to inter-yoke portions separated from each other by a permanent magnet structure spacer of defined magnetic permeability

An active magnetic rotor-bearing assembly for conveying a fluid comprising a rotor assembly is disclosed and a bearing assembly for contactless bearing the rotor assembly, where the bearing assembly comprises an even number of electromagnetic units arranged around a central structure each comprising a first salient established by a magnetic material and a permanent magnet providing a first magnetic pole and a coil around the salient, further comprises an inter-yoke with inter-yoke portions connected to the first salient of each electromagnetic unit and being separated from each other by structure spacers, providing a closed first magnetic flux passing the rotor assembly applying a first attractive force further comprising a position stabilizing portion perpendicular to the first attractive force on the rotor-assembly and the coils providing an electromagnetic flux between each first salient and the rotor assembly for applying adaptable axial force and/or tilting torque to the rotor assembly ...

Vacuum pump with a shaft seal

A pump portion (20) is provided with an impeller (23) internal to a casing (21). The impeller (23) is coupled with a rotor (12) physically out of contact therewith and it is also supported by a controlled, magnetic bearing portion (111) physically out of contact therewith. The impeller (23) is rotated by a motor (13) to discharge fluid. A position sensor (62) detects the impeller (23) position in levitation and in response to the sensor's output the magnetic bearing portion (111) is controlled. The magnetic bearing portion is configured of a plurality of electromagnets formed of a magnetic pole (51-56), a yoke (71-76) and a coil (81-86). The electromagnet has magnetic S and N poles each with at least yoke and coil arranged circumferentially.

MAGNETIC BEARING CONTROL DEVICE AND VACUUM PUMP USING THE SAME

PROBLEM TO BE SOLVED: To provide a magnetic bearing control device provided with a compensating circuit capable of advancing the phase of a control signal of large amplitude and lowering gain when the control signal is inputted and a vacuum pump provided with the device. SOLUTION: Impedance circuits 15 and 16 having primary delay transmission functions are connected via diodes 5 and 6 biased in opposite directions in parallel with a resistor 18 applying negative feedback to an operational amplifier 2. The diodes 5 and 6 do not operate for a signal of small amplitude and the negative feedback is performed by the resistor 18. The diodes 5 and 6 are conducted for the signal of large amplitude and the negative feedback is applied by the impedances 15 and 16 together with the resistor 18. As a result, gain of the operational amplifier 2 is lowered and the phase of an output signal is advanced. Operating voltage of a limiter is set by bias voltage of the diodes 5 and 6. COPYRIGHT: (C)2002,JPO ...

ШНЕКОЦЕНТРОБЕЖНЫЙ НАСОС

Изобретение относится к насосостроению и может быть использовано преимущественно в турбонасосных агрегатах ЖРД. Шнекоцентробежный насос содержит корпус и установленные на валу шнек и крыльчатку. Шнек выполнен с бандажом. Между торцом бандажа шнека и торцом крыльчатки выполнена магнитная муфта. Между валом и шнеком установлен магнитный подшипник. Шнек установлен с возможностью осевого перемещения и подпружинен в торец со стороны входа насоса пружинами автомата управления нагрузкой шнека. Пружины установлены внутри корпуса насоса и упираются с одной стороны в корпус насоса, а с другой - в торец бандажа шнека со стороны входа насоса. Автомат управления нагрузкой шнека содержит также направляющие для пружин, стакан, сцентрированный во втулке, установленной в корпусе насоса перед шнеком, и средство предотвращения проворота стакана. На торце стакана и на торце бандажа со стороны входа насоса закреплены контактные кольца торцового уплотнения. Изобретение направлено на улучшение кавитационных свойств ...

Clean pump with impeller in housing part, e.g. for medical instrument - has rotor fitted at one side of impeller with housing part in- between and two passive magnetic bearings for radial support of impeller.

One passive magnetic bearing (4) is arranged at one side of the impeller (3) and the other bearing (9) at the rotor side opposite the impeller. An active magnetic bearing with an electromagnet holds the impeller central against the effect of the passive magnetic bearings. The active magnetic bearing includes a multiple of combined electromagnets (20), each including a permanent magnet (21), lying on the other side of the impeller w.r.t. the housing part (2). An electromagnet controls the degree of freedom of the impeller, in the axis or rotation direction and around the centre of gravity. A control system (30) is provided for the zero power control of the active magnetic bearing. USE/ADVANTAGE - Semiconductor mfr. and medical instruments. Flow medium is not contaminated by electromagnets. Maintains driving power and increases radial stiffness with redn. of current consumption.

Magnetically located type of pump esp. magnetic suspension pump

The magnetic field effective between the magnetic coupling (14, 24) is controlled or regulated. A processing unit (41) is provided for determining a relationship between the current flow in the motor (13) and the liquid flow or between the current flow in the motor and the outlet pressure. A regulation unit (42) regulates the flow or the pressure, based on an alteration of the rotation of the motor, corresp. to the relationship between the current and the flow or between the current and the pressure, which would be determined by the processing unit (41).

Vakuumpumpe

The vacuum pump (10) comprises a stator (14) in which a rotor (12) with radial magnetic bearings (16,19) and with an axial magnetic bearing (40) is mounted in a contactless manner. The axial magnetic bearing (40) produces an axial magnetic field by means of a magnet coil (40) with a yoke iron (44) on the stator (14).An axially magnetized permanent magnet (50) is provided on the rotor (12), located approximately axially opposite the yoke iron (44). A permanently axially magnetized compensating magnet (54) is provided on the stator (14) and arranged axially opposite the permanent magnet of the rotor (50) and polarized in the opposite direction, whereby the permanent magnet (50) of the rotor and the compensating magnet (54) repel each other. In a centre position, the rotor is bias-free by compensating the forces of attraction between the permanent magnet of the rotor and the yoke iron. As a result, the centre position of the rotor can be adjusted with relatively small magnet coil flows. This ...

Turbovakuumpumpe

Zentrifugalpumpe mit Störungskorrektur

Zentrifugalpumpe mit Störungskorrektur

Pump and heat pump apparatus

Cardiac pump

A cardiac pump 101 with impellers 113 comprises a magnetic bearing assembly 136 providing rotatable radial support between the cardiac pump rotor 108 and the housing 107 and having first and second magnetic bearing portions 136a,136b, the axial position of which may be threadably adjustable by means of a magnetic bearing adjuster 176 to bias the cardiac pump rotor 108, 208 in an axial direction and provide a preload force to a plain bearing assembly 126 configured to rotatably support the cardiac pump rotor 108 in at least an axial direction. There may be a further magnetic bearing assembly 156, a further plain bearing assembly, and a magnetic drive coupling 140.

Rotodynamic fluid machine

Axial flow pump/ marine propeller

An axial flow pump/marine propeller (10; 100; 200; 300; 400) has a pump body carrying a stator (20; 120; 220; 320; 420) which defines a cylindrical inner space, a rotor member (40; 140; 260; 360; 460) being rotatably located in the inner space, and electromagnetic means (24, 26, 44; 124, 126, 144) arranged between the stator and the rotor for generating a rotational magnetic field to drive the rotor to rotate. The rotor has a hollow structure with one or more propelling blades (48; 148; 283; 366) for driving the fluid to flow along the central axis of the pump. This arrangement provides a driving force which produces minimum fluid disturbance and drag therefore a high energy efficiency. The rotor is supported in the pump body by a suspension bearing mechanism which provide rotational and thrust bearing in response to the rotor's rotational and/or axial movements to retain the rotor at a balanced position. In the disclosed embodiments, the bearing means can be formed by mechanical (50; 380 ...

Vacuum pump

A vacuum pump comprising rotor assembly which is rotatable supported by a first bearing 28 and a second bearing 30, wherein at least one bearing is a ball bearing, the vacuum pump comprises a preload force compensator unit 38, which generates a force to adjust the preload force on the at least one ball bearing, a control unit 36 is connected to at least one sensor detect a pumping parameter, then further connected to the preload force compensator unit to generate a force dependent on the detected pump parameter. The preload force generator may be mechanical, electromagnetic or smart material. The controller may consider more than one parameter of the pump when determining the appropriate preload force. The controller may operate a machine learning module to determine the appropriate preload force.

Electro-magnetic propulsion engine

An electro-magnetic propulsion engine comprises a core-rotating hub 5, attached to which are individual fan blades 6, and an integrated electro-magnetic drive unit. Axial rotation is achieved by electro-magnetic drive such that sources of known polarity located on the rotating structure are either attracted or repelled by sources of known polarity on a static part of the structure. Permanent magnets 13 (or equivalent electromagnets) are mounted on the rotor's rotating shroud 7 or the rotor hub 5, stationary electromagnets 14 of variable polarity and power being mounted in opposition. A bearing structure 11,17 is provided and and engine may be configured with stator magnets and rotating electromagnets.

Apparatus for operating a blood pump

SEALS LOTS ROTATION BLOOD PUMP

EASILY CLEANING CENTRIFUGAL PUMP

DEVICE FOR THE CAREFUL PROMOTION OF EINODER POLYPHASE FLUIDS

GAS FRICTION PUMP

CENTRIFUGAL PUMP

HYDRAULIC SEALING FOR ROTARY PUMPS

INTRAVASALE BLOOD PUMP

Method for adjusting the position of a rotating component which is borne by means of a permanent-magnet

Hybrid magnetically suspended and rotated centrifugal pumping apparatus and method

Device for axially conveying fluids

DEVICE FOR DELIVERING SINGLE-PHASE OR MULTIPHASE FLUIDS WITHOUT ALTERING THE PROPERTIES THEREOF

The invention relates to a device for delivering single-phase or multiphase fluids without altering the properties thereof. The aim of the invention is to provide a device for carefully delivering single-phase and multiphase fluids which, consisting of a simple construction, does not alter or only insignificantly alters the properties of the fluid to be delivered and, in particular, minimizes dead water zones and turbulences of the fluid to be delivered. The invention provides a device for delivering single-phase or multiphase fluids which is comprised of a tubular cavity (1) that guides the fluid, whereby the rotor (32) of the electric motor is configured as a rotatable delivering part (5) mounted with axial alignment inside the tubular cavity (1). The inventive device also comprises at least one fluid guiding device (7, 7') arranged in front of and/or behind the delivering part (5) and is characterized in that the rotatable delivering part (5) is contactlessly mounted by means of a magnetic ...

MAGNETIC DRIVE, SEAL-LESS PUMP

A magnetic drive, seal-less combination axial air and water pump includes a housing having an inlet and an outlet at least one impeller mounted for rotation within the housing, and a magnetic drive surrounding the first rotor and the second rotor, the magnetic drive being configured to transmit torque to the first rotor and a second rotor at a location radially spaced from a central axis of the first rotor and the second rotor.

INTRAVASCULAR BLOOD PUMP

The blood pump proposed has a motor housing (20) and a pump housing (32) which are rigidly connected to each other, spaced a certain distance apart. Both housings (20, 32) have essentially the same diameter of only about 6 mm, thus enabling the blood pump to be introduced, using a catheter (14), to its point of use through the body's blood-vessel system. The impeller (34) is mounted in the pump housing (20) on a longitudinally and radially acting bearing (47) designed as a point-support bearing. To avoid oscillation of the impeller (34), it is fitted with an alignment device (53) which may have a hydrodynamic or mechanical action. The rotary drive from the motor is transmitted to the impeller (34) by a magnetic coupling (53).

Насос для прокачки магнитореологической жидкости

... 1. Насос для прокачки магнитореологической жидкости, содержащий корпус, внутри которого на приводном валу установлен ротор из немагнитного материала, магнитную систему, разделитель, каналы подвода и отвода магнитореологической жидкости, расположененные по обе стороны от разделителя, уплотнительные элементы, отличающийся тем, что ротор выполнен в виде пары дисков, установленных с зазором относительно друг Фиг. 1 друга с образованием полости для прокачки магнитореологической жидкости, разделитель консольно закреплен в корпусе и установлен в указанной полости между дисками, а каналы подвода и отвода магнитореологической жидкости выполнены в корпусе и связаны с полостью для ее прокачки, при этом магнитная система установлена в корпусе вдоль указанной полости снаружи дисков, но вне зоны указанной полости, примыкающей к каналам подвода и отвода магнитореологической жидкости.

ПОДШИПНИК НА ЭЛЕКТРОМАГНИТНОЙ ПОДВЕСКЕ

Настоящее изобретение относится к подшипнику на электромагнитной подвеске (подушке). В настоящем изобретении раскрывается подшипник на электромагнитной подвеске, который включает несколько отдельных электромагнитов, статор с размещенными в нем несколькими отдельными электромагнитами, в котором статор выполнен из проницаемого материала, ротор, окруженный несколькими отдельными электромагнитами, в котором ротор выполнен из проницаемого материала, внешний корпус с размещенным в нем статором, внутренний корпус, установленный на внутренней поверхности ротора и регулятор тока, для регулирования количества тока и направления тока электромагнитов с целью регулирования величины электромагнитной силы и полярности. Кроме того, ротор установлен в статоре, а электромагниты установлены в чередующемся порядке. При этом электромагниты имеют пятиугольную форму электромагнитов и каждый из них снабжен обмоткой подмагничивания. Кроме того электромагниты статора и ротора установлены в чередующемся порядке таким ...

Electromagnetically suspended and rotated centrifugal pumping apparatus and method

HYBRID PUMP.

PUMP HAS PLANTABLE BLOOD

Aparelho para bombear fluidos e uma bomba rotativa para bombear fluido através de um paciente.

MAGNETIC LEVITATION-TYPE PUMP DEVICE, METHOD FOR ESTIMATING VISCOSITY OF FLUID BY MAGNETIC LEVITATION-TYPE PUMP DEVICE, AND METHOD FOR ESTIMATING FLOW RATE OF FLUID BY MAGNETIC LEVITATION-TYPE PUMP DEVICE

The present invention makes it possible to more accurately estimate fluid viscosity without being constrained with respect to the structure of a device. A magnetic levitation-type pump device (100) for transferring a fluid (L) by magnetically levitating and rotating an impeller (104), wherein the magnetic levitation-type pump device (100) is provided with: a magnetic bearing unit (101) for supporting the impeller in a non-contact manner by magnetic force; an applied current control unit (154) for controlling a current applied to electromagnets (116) provided to the magnetic bearing unit; a displacement sensor (118) for detecting displacement of the impeller; a calculation unit (158) for calculating the phase difference between the impeller displacement and an alternating current, and/or the amplitude ratio between the impeller displacement and the alternating current, the impeller displacement being due to the vibration of the impeller and being detected by the displacement sensor, when ...

ELECTROMAGNETIC SUSPENSION BEARING

The present invention discloses an electromagnetic suspension bearing, which comprising a stator, a rotor, an outer casing, an inner casing and a current controlling device. The rotor and the stator are assembled together, with the rotor being disposed inside the stator. The pentagon electromagnets of the stator and those of the rotor are arranged in an alternate manner so that the rotor may be fixedly held in the stator through the magnetic repulsion therebetween. With this structure, it can obtain stable bearing. Also, the outer casing and the inner casing enclose the rotor and the stator so as to shield the electromagnetic force generated by the electromagnet. In addition, the current controlling device is used to control the amount and the direction of the current, and thus control the strength of the electromagnetic force and the polarity.

EXHAUST GAS TURBOCHARGER

The invention relates to an exhaust gas turbocharger (1) with a shaft (2) on which a turbo turbine (4) and a compressor turbine (3) are mounted and which is guided in radial bearings (5, 6) and at least one axial bearing (9). The inventive turbocharger is characterized in that the radial bearings (5, 6) are configured as passive magnetic bearings comprising permanent magnets (23 to 31) that produce axial magnetic fluxes and the axial bearing (9) is configured as an active magnetic bearing comprising a solenoid (55), an axial sensor and a control for controlling the electric power impinging the solenoid (55).

PUMP WITH MAGNETIC BEARINGS

A pump includes an impeller (310), a stator (380), and a plurality of permanent magnets (320) forming bearing poles coupled to a selected one of the stator or the impeller. The pump further includes a plurality of shorted coils (370) coupled to the other of the stator or the impeller. The magnets may be arranged as a Halbach array. The plurality of bearing poles and shorted coils co-operate to form an electrodynamic bearing during rotation of the impeller. The electrodynamic bearing supports the impeller either axially or radially during operation of the pump. Currents induced into each coil by a single bearing pole or by a plurality of bearing poles substantially simultaneously produce an electrodynamically generated magnetic field that repels the inducing bearing pole(s) when the impeller is rotating.

Immersion pump, especially for low-boiling fluids

An immersion pump, especially for low-boiling fluids, having a support for a shaft and a ferromagnetic impeller wheel mounted to the shaft. The support includes at least one controllable electromagnet that operates to axially support and position the impeller wheel. An outlet path is also provided to enable vapor bubbles within the moving fluid to escape from the pump and be returned to the liquid supply.

Centrifugal pump apparatus

A centrifugal blood pump apparatus includes an impeller provided in a blood chamber, first and second permanent magnets provided in one surface and the other surface of the impeller respectively, a third permanent magnet provided in an inner wall of the blood chamber, and a magnetic element and a coil for driving the impeller to rotate with a diaphragm being interposed. First and second grooves for hydrodynamic bearing different in shape and depth from each other are formed in the inner wall of the blood chamber facing the impeller, and third and fourth grooves for hydrodynamic bearing different in shape and depth from each other are formed in the diaphragm facing the impeller. The second and fourth grooves for hydrodynamic bearing generate high hydrodynamic pressure when the impeller is activated to rotate, while the first and third grooves for hydrodynamic bearing generate high hydrodynamic pressure when the impeller steadily rotates.

Compressor unit with a damped axial check valve for a discharge outlet

The invention relates to a compressor unit (200) for a refrigeration system using a refrigerant. The compressor (200) unit includes a centrifugal compressor (201) for compressing the refrigerant, wherein the compressor (201) has a discharge outlet (204) for discharging the compressed refrigerant, and a check valve (1; 100; 301a). An inlet (83) of the check valve (1; 100; 301a) is in fluid connection with the discharge outlet (204) of the compressor (201). In order to provide a more reliable and more quite compressor unit (200), the check valve (1; 100; 301a) is a nozzle check valve including a damping mechanism (41, 50; 50, 141), wherein a closing parameter of the check valve (1; 100; 301a) is between 50 s/m2and 2000 s/m2, wherein the closing parameter is a closing time of the check valve (1; 100; 301a) divided by a port area of the check valve (1; 100; 301a).

High-temperature motor pump

There is disclosed a high temperature pump which is compact in size, reasonable in manufacturing cost and capable of stable pumping operation. The high-temperature motor pump comprises a pump portion for pumping a liquid, a motor portion integrated with the pump portion for driving the same, a rotatable shaft for transmitting a rotation of the motor portion to the pump portion. A magnetic bearing is provided within the motor portion for supporting one end of the rotatable shaft by actively controlling a position thereof in a radial direction. A hydrostatic bearing is provided within the pump portion for supporting the other end of the rotational shaft in a radial direction by using a hydrostatic pressure of a portion of the liquid pumped by the pump portion. ...

LIQUID PUMP

PURPOSE: To efficiently force-feed liquid fluid of very low temperature by setting the suction port of an initial stage impeller to face upward and the suction port of the next stage impeller to face downward, and arranging magnetic bearings putting the initial stage impeller between. CONSTITUTION: Liquid fluid of very low temperature flowing from a suction port B always cools a radial magnetic bearing 15. The liquid fluid passed through an inducer 17 is passed through an initial stage impeller 19, pressurized and passed through a diffuser 18, and branched into two directions in a chamber C. One is fed as pressurized liquid fluid from a discharge port 6, and the other is let flow to the suction port D of the next stage impeller 26. The liquid fluid passed through the next stage impeller 26 is further pressurized, it lubricates properly a ball bearing 23 for touchdown, passes by while cooling a radial magnetic bearing 22 over the bearing 23, and flows in the back of the initial stage impeller ...

УСТРОЙСТВО ДЛЯ АКСИАЛЬНОГО НАГНЕТАНИЯ ЖИДКОСТЕЙ

... 1. Устройство для аксиального нагнетания жидкостей, состоящее из полого цилиндрического корпуса, пропускающего жидкость в продольном направлении, из расположенного внутри корпуса в продольном направлении нагнетающего элемента, снабженного магнитной подвеской и соосного расположенному с внешней стороны полого корпуса статору мотора, способного вращать указанный нагнетающий элемент, причем этот снабженный магнитной подвеской нагнетательный элемент имеет роторные лопасти, отличающееся тем, что дополнительно к магнитной подвеске используется гидродинамическая подвеска. 2. Устройство по п.1, отличающееся тем, что подвеска нагнетающего элемента включает в себя активно стабилизирующую в осевом направлении магнитную подвеску, пассивную радиальную магнитную подвеску и радиальную гидродинамическую подвеску. 3. Устройство по любому из пп.1 и 2, отличающееся тем, что радиальная гидродинамическая подвеска выполнена в виде закрепленного на нагнетающем элементе цилиндрического поддерживающего кольца с ...

LAGERSYSTEM FÜR EINEN ROTOR

FLUIDPUMPE MIT MAGNETISCH AUFGEHÄNGTEM LAUFRAD

TURBOPUMPE MIT MAGNETISCH GELAGERTEM FLUEGELRAD

Kreiselpumpe

INTRAVASALE BLUTPUMPE

LAGERUNG FÜR EINEN ROTOR EINER STRÖMUNGSMASCHINE SOWIE DEREN VERWENDUNG

Electro-magnetic propulsion engine

Magnetically suspended fluid pump and control system

A SYSTEM FOR CARDIAC ASSIST AND ARRHYTHMIA TREATMENT

A system for cardiac assist and arrhythmia treatment comprises an implantable defibrillator for connection to the heart, an implantable blood pump (51) connectable between the circulatory system and the heart and a flow rate controller. The flow rate controller acts to reduce the volume of blood in a heart ventricle prior to defibrillation. A preferred blood pump comprises a rotor located within a hollow stator which both include magnets to create a magnetic suspension to magnetically support the rotor radially in the stator. A Lorentz force axial bearing is used to support the rotor axially in the stator. (Figs 1-3 not shown). A preferred flow rate controller comprises a heart measurement member eg a heart caliper, which measures the distention and/or contraction of a heart ventricle and an angular measurement device to measure the changes in angular position between the arms of the caliper. The measurement device may comprise an electronic eddy current position sensor or a pair of ultrasonic ...

Fluid pump and control system

ELECTROMAGNETICALLY STORAGE AND PROPELLED CENTRIFUGAL PUMP AND PROCEDURE

HYDRAULIC PUMP WITH MAGNETICALLY HUNG UP IMPELLER

FL�SSIGKEITSPUMPE

SYSTEMS, A LEVITIERENDES AND A ROTATING PUMPODER MIXING ELEMENTS USING AND PERTINENT ONE THE PROCEDURES

SEALS LOTS ROTARY PUMP WITH PASSIVE-MAGNETIC RADIAL BEARINGS AND IN BLOOD CURRENT AXIAL-THRUST BEARINGS

PUMP WITH MAGNETIC BEARINGS

Fluid pump with magnetically levitated impeller

Generating energy from fluid expansion

An apparatus includes an electric generator having a stator and a rotor. A turbine is coupled to an end of the rotor to rotate at the same speed as the rotor. The turbine may rotate in response to expansion of a working fluid flowing from an inlet side to an outlet side of the turbine. The apparatus also includes a housing assembly with an inwardly oriented shroud, which is located at close proximity to the turbine. The proximity of the shroud to the turbine establishes the pressure ratio of the turbine, allowing the system to operate without seals. Magnetic bearings and position sensors are used to maintain the distance between the shroud and the wheel. In certain implementations, the positioning of the turbine can be controlled to optimize machine performance.

MAGNETIC LEVITATION TYPE VACUUM PUMP AND MAGNETIC LEVITATION DEVICE

A magnetic levitation type vacuum pump includes an electromagnet magnetically levitating a rotor by a magnetic force, an electromagnet driving circuit supplying an electromagnet current including a magnetic levitation control current component and a carrier wave current component having a frequency band higher than the magnetic levitation control current component to the electromagnet coil, a levitated position detecting circuit detecting the carrier wave current component and generating a levitated position signal of the rotor, a magnetic levitation control circuit inputting a current command of the magnetic levitation control current component to the electromagnet driving circuit based on the levitated position signal. The electromagnet coil has a primary coil and a secondary coil connected in parallel with the primary coil. An interrupting circuit connected in series with the secondary coil for the carrier wave current component passing therethrough and interrupting the magnetic levitation control current component is further included. 1. A magnetic levitation type vacuum pump , comprising:a rotor in which an exhausting unit is formed;a motor, rotationally driving the rotor;an electromagnet, magnetically levitating the rotor by a magnetic force and an electromagnet coil wound around a core;an electromagnet driving circuit, supplying an electromagnet current to the electromagnet coil, wherein the electromagnet current comprises a magnetic levitation control current component for magnetically levitating the rotor and a carrier wave current component having a frequency band higher than that of the magnetic levitation control current component and for detecting a levitated position of the rotor;a levitated position detecting circuit, detecting the carrier wave current component and generating a levitated position signal of the rotor;a magnetic levitation control circuit, inputting a current command of the magnetic levitation control current component to the ...

Electric Machine having Two Rotors and at least Two Bearings

An electric machine is provided. The electric machine includes at least one stator, a shaft, movable in rotation around an axis of rotation, two rotors, each being interdependent of the shaft, at least two bearings, able to support both rotors and the shaft. A single bearing is located between both rotors along the axis of rotation. 1. An electric machine comprising:at least one stator;a shaft movable in rotation around an axis of rotation, the shaft including three shaft pieces;at least two rotors, each rotor being interdependent of the shaft; andat least two bearings supporting the at least two rotors and the shaft, one of the at least two bearings located between the at least two rotors along the axis of rotation;each of the at least two rotors being interdependent of two of the three shaft pieces, a shaft piece positioned between the at least two rotors being common to both rotors and the three shaft pieces being interdependent in rotation around the axis of rotation.2. The electric machine according to claim 1 , wherein the machine comprises three bearings claim 1 , two bearings located claim 1 , along the axis of rotation claim 1 , on either side of the at least two rotors claim 1 , and the third bearing located between the at least two rotors along the axis of rotation.3. The electric machine according to claim 1 , wherein the machine comprises two bearings claim 1 , one bearing located near an end of the shaft claim 1 , and the other bearing being located between both rotors along the axis of rotation.4. The electric machine according to claim 1 , wherein each bearing includes a corresponding casing.5. The electric machine according to claim 1 , wherein each bearing is a magnetic bearing claim 1 , an oil bearing claim 1 , a water bearing claim 1 , a gas bearing or a roller bearing.6. The electric machine according to claim 1 , further comprising a single frame claim 1 , the at least two rotors being positioned inside the frame.7. The electric machine ...

Electric Machine

An electric machine, for example, a motor, is provided. The machine or motor includes a stator, a rotor, at least one main bearing for supporting the rotor relative to the stator in a main range of speeds and at least one secondary bearing suitable for supporting the rotor relative to the stator when the first main bearing is faulty. Each secondary bearing is a passive electrodynamic bearing and includes at least one permanent magnet and a moveable electric conductor element. 1. An electric machine comprising:a stator;a rotor;at least one main bearing supporting the rotor relative to the stator throughout a main range of speeds; andat least one secondary bearing supporting the rotor relative to the stator when the first main bearing is faulty, the at least one secondary bearing being a passive electrodynamic bearing including at least one permanent magnet and a moveable electric conductor element.2. The electric machine according to claim 1 , further comprising a further main bearing and a further secondary bearing for supporting the rotor relative to the stator when the further main bearing is faulty.3. The electric machine according to claim 1 , wherein the at least one secondary bearing supports the shaft in a secondary range of speeds.4. The electric machine according to claim 1 , further comprising at least one auxiliary bearing associated with the at least one main bearing claim 1 , the at least one auxiliary bearing supporting the rotor relative to the stator in an auxiliary range of speeds different from the main range of speeds.5. The electric machine according to claim 4 , wherein the at least one auxiliary bearing is a smooth bearing.6. The electric machine according to claim 5 , wherein the smooth bearing includes a bearing ring claim 5 , consists of a bearing ring or is a bearing with pads.7. The electric machine according to claim 4 , wherein the at least one auxiliary bearing includes at least one bearing with rolling elements.8. The electric machine ...

CONTROL FOR ROTATING ELECTRICAL MACHINERY

An example rotating electrical machine includes a stator assembly, a rotor, and a controller. The stator assembly has two or more stator control coils and is centered on a Z axis that is perpendicular to an XY plane defined by mutually perpendicular X and Y axes. The rotor is configured to rotate about a rotational axis that is nominally collinear with the Z axis and has a magnet array that provides a magnetic field configured to pass through the stator control coils. The controller is configured to control the stator control coils to selectively generate magnetic fields that interact with the magnetic field of the magnet array to: control rotation of the rotor about the second axis; and one or both of: control translation of the rotor in the XY plane; and control rotation of the rotor about the X axis and the Y axis. 1. A rotating electrical machine , comprising:a stator assembly having two or more stator control coils, the stator assembly being centered on a Z axis that is perpendicular to an XY plane defined by mutually perpendicular X and Y axes;a rotor configured to rotate about a rotational axis that is nominally collinear with the Z axis, the rotor having a magnet array that provides a magnetic field configured to pass through the two or more stator control coils;a controller configured to control the two or more stator control coils to selectively generate magnetic fields that interact with the magnetic field of the magnet array to:control rotation of the rotor about the second axis; and control translation of the rotor in the XY plane; and', 'control rotation of the rotor about the X axis and the Y axis., 'one or both of2. The rotating electrical machine of claim 1 , further comprising:one or more upper rotor position sensors configured to detect a position of an upper end of the rotor with respect to an upper end of the stator assembly; andone or more lower rotor position sensors configured to detect a position of a lower end of the rotor with respect to a ...

SPINDLE MOTOR

A spindle motor is provided, the motor including a bearing assembly including an upper surface-opened cylindrical bearing housing and a bearing accommodated in the bearing housing and formed with a rotation shaft hole; a stator including a core coupled to a periphery of the bearing housing and a coil wound on the core; a rotation shaft inserted into the rotation shaft hole; a rotor including a disk-shaped yoke coupled to the rotation shaft and a magnet coupled to the yoke to face the core; and a suction magnet arranged at the yoke facing the core, wherein the bearing housing includes a body coupled to the core and a core fixture bent from the body to face the core, and the suction magnet is so arranged as to face the core fixture corresponding to an external side of a bent unit bent from the body for forming the core fixture. 1. A spindle motor , comprising:a bearing assembly including an upper surface-opened cylindrical bearing housing and a bearing accommodated in the bearing housing and formed with a rotation shaft hole;a stator including a core coupled to a periphery of the bearing housing and a coil wound on the core;a rotation shaft inserted into the rotation shaft hole;a rotor including a disk-shaped yoke coupled to the rotation shaft and a magnet coupled to the yoke to face the core; anda suction magnet arranged at the yoke facing the core,wherein the bearing housing includes a body coupled to the core and a core fixture bent from the body to face the core, and the suction magnet is so arranged as to face the core fixture corresponding to an external side of a bent unit bent from the body for forming the core fixture.2. The spindle motor of claim 1 , wherein the core fixture takes the shape of a ring claim 1 , and a ring-shaped sill is formed at a predetermined depth on an upper surface facing a bottom surface contacting the core in the core fixture.3. The spindle motor of claim 1 , wherein the bottom surface of the core fixture contacting the core is formed ...

RADIAL MAGNETIC BEARING FOR MAGNETIC SUPPORT OF A ROTOR

A radial magnetic bearing for magnetic bearing of a rotor has a stator which includes a magnetically conductive stator element, arranged circulating around a rotor. The stator element has recesses running in the axial direction of the stator element in which electrical lines from coils are arranged, wherein magnetic fields can be generated by the coils which hold the rotor suspended in an air gap arranged between the rotor and stator. A softer progression of the components of magnetic flow density in the radial direction is achieved by design measures on the transitions from one magnetic pole to the next magnetic pole, which results in a reduction of the eddy currents induced in the rotor 14.-. (canceled)5. A radial magnetic bearing for magnetic support of a rotor , said radial magnetic bearing constructed in the form of a heteropolar bearing and comprising:a rotor;a stator having a magnetically-conductive stator element which is arranged in surrounding relationship to the rotor, said stator element having a side facing towards the rotor and having recesses running in an axial direction of the stator element;coils generating magnetic fields to hold the rotor suspended in an air gap disposed between the rotor and the stator, said coils having electrical lines disposed in the recesses such that a free space remains in the recesses between the electrical lines and the air gap; anda magnetically-conductive filler element disposed in the free space, with the electrical lines terminating flush with the magnetically-conductive filler element and with the magnetically-conductive filler element terminating flush with the rotor-facing side of the stator element.6. The radial magnetic bearing of claim 5 , wherein the filler element is configured for placement into the free space in the axial direction of the stator element.7. A radial magnetic bearing for magnetic support of a rotor claim 5 , said radial magnetic bearing constructed in the form of a heteropolar bearing and ...

MAGNETIC BEARING ASSEMBLY AND ARRANGEMENT OF POSITION SENSORS FOR A MAGNETIC BEARING ASSEMBLY

The subject matter described herein includes a magnetic bearing assembly and an arrangement of position sensors for the magnetic bearing assembly. In one example the magnetic bearing assembly includes a rotor for fixedly coupling to a shaft for rotating with the shaft. The assembly further includes at least one stator assembly located adjacent to the rotor and circumferentially surrounding the shaft. The stator assembly includes a control coil for magnetically supporting the rotor. The stator assembly further includes a plurality of position sensors that are circumferentially spaced from each other and that extend radially from the stator assembly for measuring an indication of axial displacement of the rotor. 1. A magnetic bearing assembly comprising:a rotor for fixedly coupling to a shaft for rotating with the shaft; andat least one stator assembly located adjacent to the rotor and for circumferentially surrounding the shaft, the stator assembly including a control coil for magnetically supporting he rotor and a plurality of position sensors circumferentially spaced from each other and extending radially from the stator assembly for measuring an indication of axial displacement of the rotor.2. The magnetic bearing assembly of wherein the position sensors in the stator assembly are equally circumferentially spaced from each other.3. The magnetic bearing assembly of wherein the position sensors are spaced at 90 degrees from each other.4. The stator assembly of wherein the position sensors extend radially inward from the stator assembly into a gap between the stator assembly and the shaft.5. The magnetic bearing assembly of comprising a control circuit configured to determine the axial displacement of the shaft and radial displacement of the shaft using signals output by the position sensors.6. The magnetic bearing assembly of wherein the position sensors extend radially outward from an outer circumference of the stator assembly.7. The magnetic bearing assembly of ...

SUSPENDED ROTORS FOR USE IN ELECTRICAL GENERATORS AND OTHER DEVICES

Apparatuses employing suspended rotors are provided. In one embodiment, an apparatus includes a housing forming an internal cavity and a rotor disposed in the internal cavity of the housing. The rotor has a first end and a second end. The apparatus also includes a first end ring coupled to the first end of the rotor and a second end ring coupled to the second end of the rotor. The first end ring and the second end ring are each magnetically repulsed from the housing to cause the rotor to be suspended relative to the housing. 1. An apparatus comprising:a housing forming an internal cavity;a rotor disposed in the internal cavity of the housing, the rotor having a first end and a second end;a first end ring coupled to the first end of the rotor; anda second end ring coupled to the second end of the rotor, wherein the first end ring and the second end ring are each magnetically repulsed from the housing to cause the rotor to be suspended relative to the housing.2. The apparatus of claim 1 , wherein the housing has a first end adapted to face the first end ring claim 1 , the first end of the housing comprising a first housing magnet having a magnetic polarity;wherein the housing has a second end adapted to face the second end ring, the second end of the housing comprising a second housing magnet having the magnetic polarity;wherein the first end ring has the same magnetic polarity as the first housing magnet; andwherein the second end ring has the same magnetic polarity as the second housing magnet.3. The apparatus of claim 1 , further comprising:a first rotor interface adjacent the first end of the rotor, the first rotor interface comprising one or more first interface magnets having a magnetic polarity; anda second rotor interface adjacent the second end of the rotor, the second rotor interface comprising one or more second interface magnets having the magnetic polarity;wherein the first end ring has the same magnetic polarity as the one or more first interface magnets ...

AXIAL BEARING DEVICE HAVING INCREASED IRON FILLING

An axial bearing device includes an annular electrical sheet arrangement having individual sheets which protrude radially outward. In addition, an electrical coil is provided in the axial bearing device and is inserted into the electrical sheet arrangement to generate a magnetic field in the electrical sheet arrangement. The electric sheet arrangement includes at least two concentric electrical sheet rings. All adjacent electrical sheets of each electrical sheet ring substantially abut at the inner circumference of the respective electrical sheet ring. 19.-. (canceled)10. A magnetic axial bearing device , comprising:an annular electrical sheet arrangement having individual sheets which protrude radially outward, with adjacent sheets forming a gap in a circumferential direction, said electrical sheet arrangement having at least two concentric electrical sheet rings, with essentially all the adjacent sheets of each electrical sheet ring meeting at the inner circumference of the electrical sheet ring; andan electrical coil inserted into the electrical sheet arrangement for producing a magnetic field in the electrical sheet arrangement.11. The magnetic axial bearing device of claim 10 , wherein the electrical sheet arrangement has three concentric electrical sheet rings claim 10 , with a middle one of the electrical sheet rings having a depression for insertion of the electrical coil.12. The magnetic axial bearing device of claim 11 , wherein the middle one of the electrical sheet rings has an opening in an axial direction for feeding through cables for the electrical coil.13. The magnetic axial bearing device of claim 10 , further comprising an annular pot accommodating the electrical sheet arrangement.14. The magnetic axial bearing device of claim 13 , further comprising at least one retaining ring for retaining the electrical sheet arrangement in the pot.15. The magnetic axial bearing device of claim 14 , wherein the electrical sheet arrangement has three concentric ...

ROTATIONAL MACHINE AS WELL AS APPARATUS HAVING A ROTATIONAL MACHINE

The invention relates to a rotational machine, designed as a bearing free motor, including a stator () designed as a bearing and drive stator having a stator winding () and a disc-shaped rotor () stored magnetically contact free within the stator (). In this connection an axial height (H) of the rotor () is smaller than or equal to a half diameter (D) of the rotor () and with the rotor () being passively stabilized by reluctance forces with regard to the stator () both against a displacement along a rotational axis (A) of the rotor () and also against a tilting from an equilibrium position (G), and with the stator () including a permanent magnet () for the generation of a homopolar magnetic flux (HΦ). In accordance with the invention the rotor () is a ring-like rotor () rotatably arranged about a pole piece () of the stator () and the rotor () includes a ferromagnetic material (FM) and no permanent magnet. The invention also relates to a ferromagnetic rotor () without permanent magnets, as well as to an apparatus having a rotational machine (). 12342444242644524. A rotational machine , designed as a bearing free motor , including a stator () designed as a bearing and drive stator having a stator winding () and a disc-shaped rotor () stored magnetically contact free within the stator () , wherein an axial height (H) of the rotor () is smaller than or equal to a half diameter (D) of the rotor () and with the rotor () being passively stabilized by reluctance forces with regard to the stator () both against a displacement along a rotational axis (A) of the rotor () and also against a tilting from an equilibrium position (G) , and with the stator () including a permanent magnet () for the generation of a homopolar magnetic flux (HΦ) , characterized in that the rotor () is a ring-like rotor () rotatably arranged about a pole piece () of the stator () and in that the rotor () includes a ferromagnetic material (FM) and no permanent magnet.2655. A rotational machine in ...

DEVICE AND METHOD FOR CONTROLLING AN ACTIVE MAGNETIC BEARING

A command procedure for an active magnetic bearing, the magnetic bearing comprising a series of electromagnetic actuators forming a stator, each actuator being suitable for exerting radial force on the rotor, a ferromagnetic body forming a rotor, kept free of contact between the electromagnetic actuators and suitable for being set in rotation around an axis of rotation, the rotor being suitable to undergo precession movements in particular. Sensors suitable for detecting radial displacements of the rotor and issuing position signals representative of the radial position of the rotor in relation to the actuators. Calculation of at least one actuator command signal the calculation of the command signal consisting of the application of at least one transfer function to the position signals, the transfer function containing a number of correction coefficients. 1. A method for an active magnetic bearing , the magnetic bearing comprising:a series of electromagnetic actuators forming a stator, each of the actuators configured to receive an input signal as its command, and to exercise radial force on a rotor;a ferromagnetic body forming the rotor, wherein the rotor is kept free of contact between the electromagnetic actuators, configured to rotate around an axis of rotation, and configured to be subjected to precession movements under the action of radial momentum induced by the radial force exercised and applied perpendicular to the axis of rotation; andsensors configured to detect radial displacement of the rotor and to issue position signals representative of the radial position of the rotor in relation to the actuators,the method comprising:calculating, on the basis of the position signals, at least one actuator command signal, the calculation of the at least one actuator command signal comprises applying at least one transfer function to the position signals, the transfer function comprising a series of correction coefficients; andcontrolling the radial position of the ...

ISOLATING A DOWNHOLE-TYPE ELECTRIC MACHINE

An electric stator surrounds an electric rotor. A magnetic coupling is attached to an end of the electric rotor. The magnetic coupling is configured to transmit rotational force to or from a separate rotational device. A housing surrounds and isolates the electrical rotor, the electric stator, and a portion of the magnetic coupling, from a wellbore fluid. The housing is flooded with an incompressible fluid. A pressure within the housing is substantially the same or lower than a pressure within a wellbore environment. 1. A downhole-type electric machine comprising:an electric rotor;an electric stator surrounding the electric rotor;a magnetic coupling attached to an end of the electric rotor, the magnetic coupling configured to transmit rotational force to or from a separate rotational device; anda housing surrounding and isolating the electrical rotor, the electric stator, and a portion of the magnetic coupling from a wellbore fluid, the housing flooded with an incompressible fluid, wherein a pressure within the housing is substantially the same or lower than a pressure within a wellbore environment.2. The downhole-type electric machine of claim 1 , wherein the fluid in the housing lubricates bearings radially and axially supporting the electric rotor within the electric stator.3. The downhole-type electric machine of claim 1 , wherein a seal sealing the port against ingress of fluid into the housing claim 1 , wherein the seal is movable by the well fluid to apply a pressure on the incompressible fluid to equalize pressure between the incompressible fluid and the well fluid.4. The downhole-type electric machine of claim 1 , wherein the fluid in the housing cools the electric stator and bearings located within the housing.5. The downhole-type electric machine of claim 1 , wherein the electric rotor comprises a permanent magnet rotor.6. The downhole-type electric machine of claim 1 , wherein the magnetic coupling comprises a radial gap type coupling or an axial gap ...

MAGNETIC LEVITATION CENTRIFUGAL PUMP

A magnetic levitation centrifugal pump, comprises: one hollow body provided with at least one inlet connector and with at least one outlet connector for blood; one rotor element, housed inside the hollow body and comprising at least one magnetic portion, where the rotor element can be commanded in rotation about an axis of rotation, without contact, by a stator element associable with the hollow body, the rotor element comprising at least one revolving body, which defines an upper surface supporting a plurality of blades which are adapted to convey blood towards the outlet connector; where the upper surface has a substantially concave shape and where the revolving body comprises at least one through hole which is positioned along the axis of rotation. 1. A magnetic levitation centrifugal pump comprising:at least one hollow body provided with at least one inlet connector and with at least one outlet connector for blood; andat least one rotor element, housed inside said at least one hollow body and comprising at least one magnetic portion, where said at least one rotor element can be commanded in rotation about an axis of rotation, without contact, by a stator element associable with said at least one hollow body, said at least one rotor element comprising at least one revolving body, which defines an upper surface supporting a plurality of blades which are adapted to convey blood towards said at least one outlet connector; whereinsaid upper surface has a substantially concave shape and said at least one revolving body comprises at least one through hole which is positioned along said axis of rotation.2. The magnetic levitation centrifugal pump according to claim 1 , whereinsaid upper surface has a curvilinear extension to define a saddle which is adapted to receive the blood entering said at least one inlet connector.3. The magnetic levitation centrifugal pump according to claim 2 , whereinsaid at least one hole has a first opening facing said upper surface.4. The ...

HYDRODYNAMIC THRUST BEARINGS FOR ROTARY BLOOD PUMP

A rotary blood pump includes a casing defining a pumping chamber. The pumping chamber has a blood inlet and a tangential blood outlet. One or more motor stators are provided outside of the pumping chamber. A rotatable impeller is within the pumping chamber and is adapted to cause blood entering the pumping chamber to move to the blood outlet. The impeller has one or more magnetic regions. The impeller is radially constrained in rotation by magnetic coupling to one or more motor stators and is axially constrained in rotation by one or more hydrodynamic thrust bearing surfaces on the impeller. 126-. (canceled)27. A rotary blood pump comprising:a pumping chamber in fluid communication with a primary fluid flow path;an impeller rotatable on an axis within the pumping chamber and having a plurality of upper surface areas circumferentially disposed about the axis, each upper surface area facing an interior wall of the pumping chamber as the impeller rotates, each of at least a diametrically opposed pair of the upper surface areas being configured with an inclined surface area tapered in an upward axial direction and defining a hydrodynamic bearing surface having a lower pressure fluid entrance end and a higher pressure fluid exit end causing an increase in pressure acting axially downwardly on the impeller as the impeller rotates; andeach of the plurality of upper surface areas further including a pressure relief surface downstream of the higher pressure fluid exit, the pressure relief surface being configured to define a secondary fluid flow path different than the primary fluid flow path, the higher pressure entrance end of the downstream pressure relief surface being spaced from the higher pressure fluid exit end of the hydrodynamic bearing surface by a bridging surface area of the same respective upper surface area therebetween.28. The rotary blood pump of claim 27 , wherein each raised body is configured with two straight sidewalls of unequal length which intersect ...

VACUUM PUMP

A vacuum pump capable of suppressing the solidification of gas in a normal operation of a pump is provided. Provided is a vacuum pump including a casing that has an inlet port for sucking gas from outside and an outlet port for exhausting the gas to the outside; a turbo-molecular-pump mechanism that is disposed in the casing and includes rotor blades and stator blades alternately arranged in multiple stages in an axial direction; a thread-groove-pump mechanism that is disposed in the casing and is connectedly disposed on an exhaust side of the turbo-molecular-pump mechanism; first temperature regulating means that is configured to regulate cooling of the turbo-molecular-pump mechanism; and second temperature regulating means that is configured to regulate heating of the thread-groove-pump mechanism. 1. A vacuum pump comprising:a casing, the casing having an inlet port for sucking gas from outside and an outlet port for exhausting the gas to the outside;a turbo-molecular-pump mechanism, the turbo-molecular-pump mechanism being disposed in the casing and including rotor blades and stator blades alternately arranged in multiple stages in an axial direction;a thread-groove-pump mechanism, the thread-groove-pump mechanism being disposed in the casing and being connectedly disposed on an exhaust side of the turbo-molecular-pump mechanism;a bearing, the bearing rotatably holding a rotating portion of the turbo-molecular-pump mechanism and a rotating portion of the thread-groove-pump mechanism; anda motor portion configured to rotate the rotating portions,the vacuum pump further comprising:first temperature regulating means configured to regulate cooling of the turbo-molecular-pump mechanism; andsecond temperature regulating means configured to regulate heating of the thread-groove-pump mechanism.2. The vacuum pump according to claim 1 , further comprising:heat insulating means, the heat insulating means being provided between a stator of the turbo-molecular-pump mechanism ...

MAGNETIC BEARING AND METHOD FOR OPERATING A MAGNETIC BEARING

A magnetic bearing having a first bearing ring and a second bearing ring arranged concentrically in relation to the first bearing ring. The first bearing ring and the second bearing ring are mounted so as to be rotatable with respect to each other about an axis of rotation by means of electromagnets. The first bearing ring has a first magnet row and a second magnet row. The magnet rows each include electromagnets arranged at a distance from one another in a circumferential direction of the first bearing ring. The electromagnets of the magnet rows are oriented such that they can each exert a magnetic force on the second bearing ring, which magnetic force is oriented transversely to the axis of rotation and transversely to a radial plane which is arranged perpendicularly to the axis of rotation. The disclosure further relates to a method for operating a magnetic bearing. 119.-. (canceled)20. A magnetic bearing , comprising:a first bearing ring, anda second bearing ring arranged concentrically with respect to the first bearing ring, the first bearing ring and the second bearing ring mounted so as to be rotatable with respect to each other about an axis of rotation by means of electromagnets,the first bearing ring comprising a first magnet row and a second magnet row, wherein the magnet rows each comprise electromagnets arranged at a distance from one another in a circumferential direction of the first bearing ring, and the electromagnets of the magnet rows oriented such that they each exert a magnetic force on the second bearing ring, which magnetic force is oriented transversely to the axis of rotation and transversely to a radial plane which is arranged perpendicularly to the axis of rotation.21. The magnetic bearing of claim 20 , wherein the magnetic bearing comprises electromagnets only in the first magnet row and the second magnet row.22. The magnetic bearing of claim 20 , wherein the electromagnets of the magnet rows respectively comprise a coil wound about a ...

Magnetically levitated rotor and a rotary machine with such a rotor

A magnetically levitated rotor includes a magnetically effective core and a sheathing made of a thermoplastically processible fluoropolymer. The sheathing completely encloses the magnetically effective core. The magnetically effective core comprises at least one permanent magnet and each permanent magnet has a metallic coating for protection against acidic or chemically aggressive substances. A plastic coating is disposed between the metallic coating and the sheathing, and includes a polymer belonging to the family of parylenes.

PASSIVE MAGNETIC BEARING ELEMENTS AND CONFIGURATIONS UTILIZING ALTERNATIVE POLARIZATION AND AMPERIAN CURRENT DIRECTION

A ferromagnetic shield in contact with a magnet bar at the opposite end from the working surfaces of the bar eliminates the field canceling effects that arise from the Amperian currents at that end. The optimum polarization direction for such bars is one that is parallel to the azimuthal coordinate of the bar. The field at the working surface of the bar approaches that of a bar of infinite length because the shield, located on the side opposite to that of the working surface, completely eliminates, or at least substantially reduces, the field cancellation effect that normally would occur. The magnet bars with shields can be assembled on rotors and stators in flywheel storage systems and other rotating machinery. 1. An apparatus , comprising:a permanent magnet first block having six faces (face 1, face 2, face 3, face 4, face 5 and face 6), wherein face 1 is parallel with face 2 and wherein each of face 3, face 4, face 5 and face 6 are perpendicular with face 1 and face 2, wherein said first block has a B-field magnetization polarization direction that is perpendicular to face 1, wherein said first block has Amperian currents characterized as flowing on the surfaces of, and making a complete loop around said block on face 3, face 4, face 5 and face 6; anda ferromagnetic first shield in direct contact with one of face 3, face 4, face 5 or face 6.2. The apparatus of claim 1 , wherein said first shield traps at least a portion of the Amperian current characterized as flowing on the face to which said first shield is in direct contact.3. The apparatus of claim 1 , wherein said first shield reduces the field canceling effects on the Amperian current characterized as flowing on the face of said block that is opposite to the face to which said first shield is in direct contact.4. The apparatus of claim 1 , wherein said ferromagnetic first shield is in direct contact with the entirety of only one of face 3 claim 1 , face 4 claim 1 , face 5 or face 6.5. The apparatus of claim ...

Compact centrifugal pump with magnetically suspended impeller

A centrifugal fluid pump with a fully magnetically suspended rotor to improve blood compatibility when pumping blood is disclosed. The pump stabilizes radial displacements of a disc-like rotor with active control through separate electric motor and magnetic bearings to improve the pump's critical performances including device packaging size, system simplicity and reliability, stiffness and other dynamic performances of suspension, power efficiency, and others.

ACTIVE MAGNETIC BEARING COMPRISING MEANS FOR DAMPING THE RADIAL MOTION OF A SHAFT OF A ROTARY MACHINE

An active magnetic bearing comprising a plurality of electromagnetic actuators, each actuator receiving for control thereof an input current and being able to exert a radial force on a shaft of a rotary machine, with respect to the rotation axis of said shaft, the shaft being able to be held without contact between the electromagnetic actuators and to undergo radial motion when it is in rotation, means for supplying input current of each actuator, the supply means comprising means for controlling the input current of each actuator, according to the position of the shaft with respect to the actuators. The supply means comprise means for damping the radial motion of the shaft. 1. An active magnetic bearing comprising:a plurality of electromagnetic actuators, each of the electromagnetic actuators receiving an input current and being able to exert a radial force on a shaft of a rotary machine, with respect to the rotation axis of the shaft, the shaft configured to be held without contact between the electromagnetic actuators and to undergo radial motion when in rotation; anda supply device configured to supply the input current to each of the electromagnetic actuators, the supply device comprises a controller configured to control the input current of each of the electromagnetic actuators according to the position of the shaft with respect to the electromagnetic actuators, wherein the supply device comprises a dampening device configured to dampen the radial motion of the shaft.2. The magnetic bearing according to claim 1 , wherein each of the electromagnetic actuators comprises an excitation coil comprising an input terminal and an output terminal claim 1 , and the damping device is further configured to connect between the input terminal and the output terminal of each of the excitation coils.3. The magnetic bearing according to claim 2 , wherein the controller comprises a plurality of control members claim 2 , wherein each of the control members is connected between ...

Homopolar, Flux-Biased Hysteresis Bearingless Motor

Described is a bearingless motor based upon a homopolar flux-biased magnetic bearing for force generation and a hysteresis motor for torque generation. The bearingless slice motor levitates and rotates a ring-shaped rotor made of a semi-hard magnetic material. The rotor is biased with a homopolar permanent-magnetic flux, on which 2-pole flux can be superimposed to generate suspension forces. Torque is generated by a hysteretic coupling between the rotor and a rotating multi-pole stator field. 1. A homopolar flux-biased hysteresis bearingless motor comprising:(a) a stator comprising a bottom plate and a plurality of teeth projecting from said bottom plate;(b) a flux-biasing structure disposed in a central portion of said stator and having a shape selected such that said stator and said flux-biasing structure define a space having a predetermined shape;(c) a hysteresis rotor disposed in the space defined by said flux-biasing structure and stator;(d) stator windings coupled to said stator teeth and through which electric current may flow to induce two sets of magnetic flux on said hysteresis rotor said two sets of flux corresponding to (1) a motor flux; and (2) a suspension flux; and(e) means for providing a homopolar bias flux which traverses through said hysteresis rotor radially and returns via the stator teeth and the bottom plate of said stator and wherein said stator windings are configured to superpose a motor flux and a suspension flux on the homopolar bias flux to generate a torque and a radial force.2. The homopolar flux-biased hysteresis bearingless motor of wherein:(a1) said stator teeth are provided having an L-shape; and(a2) said flux-biasing structure is provided as an inner central flux-biasing structure which forms with said stator teeth an annular space having dimensions selected to accept said hysteresis rotor.3. The homopolar flux-biased hysteresis bearingless motor of wherein:said stator teeth and said bottom plate are provided from a soft magnetic ...

Vacuum pump

The present invention relates to a vacuum pump, in particular to a turbomolecular pump, having at least one pump stage and having a pressure determination unit for determining a pressure present at a suction side of the vacuum pump, said pump comprising a measurement device, with a measurement tap of the measurement device being provided in the region of the pump stage or downstream of the pump stage. 1. A vacuum pump having:at least one pump stage, anda pressure determination unit configured to determine a pressure present at a suction side of the vacuum pump and the pressure determination unit comprising a measurement device,wherein a measurement tap of the measurement device is provided in the region of the at least one pump stage or downstream of the at least one pump stage.2. The vacuum pump in accordance with claim 1 ,wherein the at least one pump stage comprises at least one rotor and a stator.3. The vacuum pump in accordance with claim 1 ,wherein the at least one pump stage comprises a Holweck stage.4. The vacuum pump in accordance with claim 1 ,wherein the measurement tap is configured as an opening in a housing of the vacuum pump receiving the at least one pump stage.5. The vacuum pump in accordance with claim 4 ,wherein the opening is also usable as a flood opening for flooding the vacuum pump or as a carrier gas opening.6. The vacuum pump in accordance with claim 1 ,wherein the measurement device comprises a pressure sensor for measuring the pressure tapped at the measurement tap, with the measurement tap being in fluid communication with the pressure sensor.7. The vacuum pump in accordance with claim 6 ,wherein the pressure sensor is a Pirani vacuum gauge or comprises a capacitive measuring tube.8. The vacuum pump in accordance with claim 1 ,wherein the pressure determination unit is configured such that the pressure present at the suction side can be determined with reference to the pressure tapped at the measurement tap.9. The vacuum pump in ...

PURGE-FREE MINIATURE ROTARY PUMP

Methods and systems are provided for the circulation of blood using a purge-free miniature pump. In one embodiment, a pump is provided that may comprise a housing including a rotor and a stator within a drive unit. In this embodiment, the pump may establish a primary blood flow through the space between the drive unit and the housing and a secondary blood flow between the rotor and stator. In another embodiment, a pump establishes a primary blood flow outside the housing and a secondary blood flow between the rotor and stator. In yet another embodiment, a method is provided for introducing the pump into the body and circulating blood using the pump. 1. A paracardial blood pump , comprising:a tubular housing;a drive unit, comprising a rotor and a stator, arranged coaxially within the housing to create a longitudinally extending primary flow channel;an impeller positioned at one end of the drive unit and connected to the rotor;a pump ring with an axial inlet positioned at one end of the housing and surrounding at least a portion of the impeller;a cannula extending from an end of the housing nearest the impeller; anda laterally branching outlet tube positioned proximate an end of the housing opposite the impeller;wherein the drive unit comprises a secondary flow channel formed between the rotor and the stator.2. The paracardial blood pump of claim 1 , further comprising a channel arranged approximately perpendicular the direction of the primary blood flow and placing the secondary flow channel in fluid communication with primary flow channel.3. The paracardial blood pump of claim 1 , further comprising a first radial magnetic bearing positioned in the drive unit near the impeller and a second radial magnetic bearing positioned towards the end of the drive unit opposite the impeller.4. The paracardial blood pump of claim 1 , further comprising an axial hydraulic bearing proximate the end of the drive unit nearest the impeller.5. The paracardial blood pump of claim 4 , ...

POWER CONSUMPTION CONTROL DEVICE, MAGNETIC LEVITATION SYSTEM, AND POWER CONSUMPTION CONTROL METHOD

A power consumption control device includes: a voltage detection circuit configured to detect whether an input power supply of a magnetic levitation system to be controlled is turned off; and a comparison unit configured to detect an operating parameter of a motor of the magnetic levitation system during an operation of the motor as a generator, and compare the operating parameter with a set parameter to obtain a comparison result; a motor controller of the magnetic levitation system controls the motor of the magnetic levitation system to operate as the generator in a case that the input power supply is turned off, a bearing controller of the magnetic levitation system adjusts a magnitude of a bearing bias current of the magnetic levitation system according to the comparison result, to control a power consumption of a magnetic levitation bearing of the magnetic levitation system within a set range. 1. A power consumption control device , comprising:a voltage detection circuit, configured to detect whether an input power supply of a magnetic levitation system to be controlled is turned off; anda comparison unit, configured to detect an operating parameter of a motor of the magnetic levitation system during an operation of the motor as a generator, and compare the operating parameter with a set parameter to obtain a comparison result;wherein, a motor controller of the magnetic levitation system controls the motor of the magnetic levitation system to operate as the generator in a case that the input power supply is turned off; a bearing controller of the magnetic levitation system adjusts a magnitude of a bearing bias current of the magnetic levitation system according to the comparison result, to control a power consumption of a magnetic levitation bearing of the magnetic levitation system within a set range.2. The power consumption control device according to claim 1 , wherein the operating parameter comprises a motor feedback current claim 1 , the set parameter ...

MAGNETIC MOUNTING WITH FORCE COMPENSATION

The aim of the invention is to better compensate for specifiable forces on a magnetic mounting. This is achieved by a magnetic mounting device with a first magnet device (), which is designed in an annular manner and which has a central axis, for retaining a shaft on the central axis in a rotatable manner by means of magnetic forces. The magnetic mounting device additionally has a second magnet device (), which is independent of the first magnet device (), for compensating for a specifiable force acting on the shaft. In this manner, the magnetic mounting device can compensate for the gravitational force or forces based on imbalances. 16-. (canceled)7. A magnetic bearing device , comprising:an annular first magnet device defining a central axis and configured to rotatably retain and center a shaft on the central axis by magnetic forces;an annular second magnet device arranged independently of the first magnet device in concentric relationship to the first magnet device and configured to compensate for a specifiable force acting on the shaft and to counteract a gravitational force,wherein the first magnet device has a first coil system with a plurality of pole pairs, and the second magnet device has a second coil system with a plurality of pole pairs which is less than the number of pole pairs of the first coil system by a value of precisely one.8. The magnetic bearing device of claim 7 , wherein the second magnet device has a permanent magnet.9. The magnetic bearing device of claim 8 , wherein the permanent magnet is spaced radially from the central axis of the first magnet device by a spacing to compensate for the specifiable force claim 8 , and further comprising a first control device integrated in the magnetic bearing device and configured to regulate the spacing.10. The magnetic bearing device of claim 7 , further comprising a first converter configured to actuate the first magnet device claim 7 , and a second converter configured to actuate the second magnet ...

CENTRIFUGAL BLOOD PUMP IMPELLER AND FLOW PATH

An impeller and rotor structure for a magnetically levitated pump define a smooth primary flow path and U-shaped secondary flow path, which extends around an annular magnetic rotor. The u-shaped secondary flow path is defined by a large outer side gap along an outer surface of the rotor, a large bottom gap along a bottom surface of the rotor and a large inner gap along an inner surface of the rotor. Shroudless impeller blades are purely radial and overhung from a thin peripheral ring attached to the annular magnetic rotor. A center post having a low aspect ratio extends through the annular rotor. The low aspect ratio is configured to prevent flow in the primary flow path from colliding directly with flow in the secondary flow path at the inner radial gap. 1. A magnetic levitation pump apparatus , comprising:a housing portion including a center post and an annular cavity concentric with the center post;an annular magnetic rotor located in the annular cavity; anda secondary flow path in the annular cavity, the secondary flow path having a U-shaped cross-section and extending around the annular magnetic rotor.2. The apparatus of claim 1 , wherein the secondary flow path is defined by a first gap between the annular magnetic rotor and an outer surface of the annular cavity claim 1 , a second gap between the annular magnetic rotor and a bottom surface of the annular cavity claim 1 , and a third gap between the annular magnetic rotor and an inner surface of the annular cavity.3. The apparatus of claim 2 , wherein the first gap claim 2 , the second gap and the third gap are between about 0.010 inches and about 0.020 inches.4. The apparatus of claim 2 , wherein the first gap claim 2 , the second gap and the third gap are between about 0.005 inches and about 0.030 inches.5. The apparatus of claim 2 , wherein a height of the annular magnetic rotor is greater than a thickness of the annular magnetic rotor.6. The apparatus of claim 2 , wherein a height of the annular magnetic ...

ROTOR BEARING FOR AN ELECTRICAL MACHINE

A disk armature generator for generating electrical energy from rotational energy of a wind power installation and comprising at least two stator components mutually offset axially along a generally horizontal rotation axis of the disk armature, and comprising, mounted therebetween so as to rotate about the rotation axis, at least one ring- or disk-shaped rotor component of the disk armature, and comprising an input-side connection for a gearbox wherein the sun gear thereof, which extends coaxially with the rotation axis of the disk armature, is coupled to at least one ring- or disk-shaped rotor component of the disk armature, wherein a rolling bearing associated with a ring- or disk-shaped rotor component of the disk armature is configured as a selected one of an angular contact ball bearing and angular contact ball bearings, having a contact angle of between 40° and 50° relative to the rotation axis, comprising a double-row angular contact ball bearing in an O arrangement. 1. A disk armature generator for generating electrical energy from rotational energy of a wind power turbine installation and comprising at least two stator components mutually offset axially along a generally horizontal rotation axis of the disk armature , and comprising , mounted therebetween so as to rotate about the rotation axis , at least one ring- or disk-shaped rotor component of the disk armature , and comprising an input-side connection for a planetary gearbox , wherein the output shaft of the sun gear thereof , which extends coaxially with the rotation axis of the disk armature , is coupled to the at least one ring- or disk-shaped rotor component of the disk armature , wherein the rolling bearing associated with a ring- or disk-shaped rotor component of the disk armature is configured as an angular contact ball bearing , or with angular contact ball bearings , having a contact angle of between 40° and 50° relative to the rotation axis , as a double-row angular contact ball bearing in ...

MOTOR

A motor includes a rotor module and a stator module. The rotor module includes a plurality of first magnet units, a plurality of second magnet units, a hollow magnetic conductance pillar and a rotating shaft. The first and second magnet units are alternately arranged to form a hollow pillar. An outer surface of the hollow pillar includes a plurality of first surfaces and second surfaces of the first and second magnet units. The first and second surfaces have different magnetic poles. The hollow magnetic conductance pillar and the rotating shaft are disposed in and through the hollow pillar and the hollow magnetic conductance pillar, respectively. The stator module includes a shell and a coil unit. The rotor module is disposed in the shell and the rotating shaft is extended out of the shell. The coil unit is disposed on an inner surface of the shell and around the rotor module. 1. A motor , comprising: a plurality of first magnet units;', 'a plurality of second magnet units, wherein the second magnet units and the first magnet units are alternately arranged to form a hollow pillar, an outer surface of the hollow pillar comprises a plurality of first surfaces of the first magnet units and a plurality of second surfaces of the second magnet units, the first surfaces and the second surfaces have different magnetic poles;', 'a hollow magnetic conductance pillar, disposed in and through the hollow pillar; and', 'a rotating shaft, disposed in and through the hollow magnetic conductance pillar; and, 'a rotor module, comprising a shell, wherein the rotor module is disposed in the shell and the rotating shaft is extended out of the shell; and', 'a coil unit, disposed on an inner surface of the shell and around the rotor module., 'a stator module, comprising2. The motor according to claim 1 , wherein an inner surface of the hollow magnetic conductance pillar is dispose with at least an engagement portion claim 1 , the rotating shaft comprises at least an engagement slot claim ...

HOMOPOLAR PERMANENT-MAGNET-BIASED ACTION MAGNETIC BEARING WITH AN INTEGRATED ROTATIONAL SPEED SENSOR

Radial poles are placed around a radial actuator target mounted on a body. The poles are separated from a cylindrical surface of the target by radial gaps and adapted to communicate a magnetic flux with it. The radial poles are equipped with electrical control windings and magnetically coupled to form magnetic control circuits. A flux return pole is adjacent to the body, separated from it by an air gap and adapted to communicate a magnetic flux with the radial actuator target. A permanent magnet generates a magnetic bias flux in the magnetic bias circuit formed by the radial actuator target, the radial poles and the magnetic flux return pole. A radial force is exerted on the actuator when the control windings are energized with a current. A Hall effect sensor measures bias magnetic field in the air gap between the magnetic flux return pole and the body. A feature on a body is adapted to produce a circumferentially local discontinuity in the magnetic field measured by the Hall effect sensor as the body rotates. 1. An electromagnetic actuator with an integrated rotational speed sensor for radial support of a rotor having a rotational axis , the electromagnetic actuator comprising:a first and a second radial control poles adjacent to an outer surface of the rotor, separated from the outer surface of the rotor by first and second radial control air gaps, respectively, and adapted to communicate magnetic flux with the outer surface of the rotor, the first radial control pole and the second radial control pole magnetically coupled to each other, and the first radial control pole, the second radial control pole and the rotor forming a radial control magnetic circuit;a first and a second electrical windings wound around the first and the second radial control poles respectively and producing radial control magnetic flux in the radial control magnetic circuit when energized with electrical currents;a bias magnetic flux return pole spaced axially from the radial control poles ...

MAGNETIC BEARING FOR A TURBOMACHINE

A magnetic bearing for a turbomachine includes a stator fixable to a structure of a turbomachine; a rotor magnetically coupled to the stator and defining a rotation axis, the rotor having a front central surface, a rear central surface opposite to the front central surface and an external surface with respect to the rotation axis; the rotor is provided with an internal channel configured to displace cooling fluid. 1. Magnetic bearing for a turbomachine , comprising a stator fixable to a structure of a turbomachine; a rotor magnetically coupled to the stator and defining a rotation axis , the rotor having a front central surface , a rear central surface opposite to the front central surface and an external surface with respect to the rotation axis; wherein the rotor is provided with an internal channel configured to displace cooling fluid.2. Magnetic bearing according to claim 1 , wherein the channel is configured to direct the cooling fluid on a motor of the turbomachine.3. Magnetic bearing according to claim 1 , wherein the channel has an intake on the front central surface and an outlet onto the side surface.4. Magnetic bearing according to claim 1 , also comprising a mechanical backup bearing configured to act on the rotor to support the rotor.5. Magnetic bearing according to the previous wherein the rotor is provided with a support extending from the front central surface claim 4 , the mechanical backup bearing being configured to engage the support.6. Magnetic bearing according to claim 4 , also comprising a landing sleeve attached to the rotor and configured to engage the mechanical backup bearing.7. Magnetic bearing according to claim 6 , wherein the landing sleeve is made as a single piece with the rotor.8. Magnetic bearing according to claim 4 , also comprising a cartridge claim 4 , the stator being housed inside the cartridge.9. Magnetic bearing according to claim 8 , wherein the mechanical backup bearing is also housed inside the cartridge.10. Magnetic ...

Axial magnetic bearing

An axial magnetic bearing includes a bearing body and a protective device. The bearing body includes a stator and a rotor. The protective device includes a first assembly fixedly mounted relative to the stator and a second assembly fixedly mounted relative to the rotor. One of the first assembly and the second assembly includes a first stopping portion, and the other of the first assembly and the second assembly includes a second stopping portion and a third stopping portion. A part of the first stopping portion is axially located between the second stopping portion and the third stopping portion. A protection gap of the protective device is smaller than a working gap of the bearing body.

BATTERY MONITORING SYSTEM

A method of monitoring a backup battery for a magnetic bearing centrifugal compressor. The method includes: establishing threshold voltage values applicable to the battery backup battery level; monitoring the actual voltage of the battery backup; comparing the actual voltage of the battery backup to the threshold voltage; initiating a soft shutdown of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time; preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage; or allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage. 1. A method of monitoring a backup battery for a magnetic bearing centrifugal compressor , the method comprising:establishing threshold voltage values applicable to the battery backup battery level;monitoring the actual voltage of the battery backup;comparing the actual voltage of the battery backup to the threshold voltage;initiating a soft shutdown of the magnetic bearing centrifugal compressor if the magnetic bearing centrifugal compressor is operating and the actual voltage is below the threshold voltage for a defined period of time;preventing the magnetic bearing centrifugal compressor from starting if the magnetic bearing centrifugal compressor is not operating and the actual voltage is below the threshold voltage;allowing the magnetic bearing centrifugal compressor to continue operation or begin operation if the actual voltage is greater than the threshold voltage.2. The method as recited in claim 1 , wherein if the battery voltage is below 12.7 v for 5 seconds and the magnetic bearing centrifugal compressor is not running claim 1 , a control panel will prevent the magnetic bearing ...

Seal device

In an exemplary embodiment, a seal device (10) that seals between a housing (11) and a rotation shaft (20) passing through the housing (11) includes: a floating ring (15) arranged with a gap h with respect to the rotation shaft (20), a seal portion (14) formed by bringing one end face of the floating ring (15) into contact with the housing (11), and a space portion j provided between the floating ring (15) and the housing (11), and the floating ring (15) includes bias means that contactlessly biases the floating ring (15) to the seal portion via the space portion j. The seal device in which the floating ring follows movement of the rotation shaft is capable of exerting a sealing operation so that vibration of the rotation shaft can be reduced.

ROTARY PUMP

Disclosed is a rotary pump including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane, which rotor is operatively connected to a drive for conveying a fluid. The drive is a bearingless motor having a stator configured as a bearing stator and drive stator and having a magnetic stator plane, wherein the stator bears a drive coil and a bearing coil lying in the stator plane and/or a drive bearing coil. The rotor is magnetically contactlessly journalled within the stator, wherein an axial height (H) of the rotor is smaller than or equal to half a diameter (D) of the rotor so that the rotor is passively magnetically stabilized by reluctance forces with respect to the magnetic stator plane both against axial displacement and against a tilt from an equilibrium position. 1. A rotary pump , including a magnetic rotor arranged in a pump housing and having a magnetic rotor plane , which rotor is operatively connected to a drive for conveying a fluid , wherein an inlet opening is provided at the pump housing for the inlet of the fluid into the pump housing and a radial outlet passage is provided for conveying the fluid out of the pump housing and wherein the drive is a bearingless motor having a stator configured as a bearing stator and drive stator and having a magnetic stator plane , at which stator a plurality of coil cores is provided with each coil core bearing a drive coil or a bearing coil and/or a drive bearing coil with each coil lying in the stator plane , wherein the rotor is magnetically contactlessly journalled within the stator and an axial height of the rotor is smaller than or equal to half a diameter of the rotor so that the rotor is passively magnetically stabilized by reluctance forces with respect to the magnetic stator plane both against an axial displacement and against a tiling from an equilibrium position , wherein the outlet passage is radially outwardly conducted away from the pump housing in the region of the stator such ...

Magnetic bearing compressor, air conditioner, and protective air gap value setting method

Provided are a magnetic bearing compressor, an air conditioner and a protective air gap value setting method. The magnetic bearing compressor includes: a rotor, a magnetic bearing, a sensor, and a control device. The magnetic bearing is sleeved on the rotor; the sensor is arranged on the magnetic bearing and is configured to detect a distance value between the rotor and the sensor on a preset plane; the control device is configured to receive the distance value and determine the minimum distance value and the maximum distance value between the rotor and the magnetic bearing according to the distance value, and obtain an absolute value of a difference of the maximum distance value and the minimum distance value; and the control device obtains a protective air gap value according to the absolute value and a preset protection coefficient when the absolute value is less than or equal to a preset air gap value.

Low-cost modular inductive position sensor and method of manufacturing it

A position sensor includes a plurality of E-shaped ferromagnetic cores arranged to define a circular opening therethrough to receive a shaft. Each E-shaped ferromagnetic core has a plurality of teeth, wherein adjacent E-shaped ferromagnetic cores of the arranged plurality of E-shaped ferromagnetic cores have an overlapping tooth. The position sensor further includes a frame surrounding the arranged plurality of E-shaped ferromagnetic cores, with the E-shaped ferromagnetic cores coupled to the frame. 1. A position sensor comprising:a plurality of E-shaped ferromagnetic cores arranged to define a circular opening therethrough to receive a shaft, each E-shaped ferromagnetic core having a plurality of teeth, wherein adjacent E-shaped ferromagnetic cores of the arranged plurality of E-shaped ferromagnetic cores have an overlapping tooth; anda frame surrounding the arranged plurality of E-shaped ferromagnetic cores, the E-shaped ferromagnetic cores coupled to the frame.2. The position sensor of claim 1 , wherein the plurality of E-shaped ferromagnetic cores are configured as a stator to receive therein the shaft configured as the rotor.3. The position sensor of claim 1 , wherein each E-shaped ferromagnetic core of the plurality of E-shaped ferromagnetic cores comprises a middle tooth and two side teeth claim 1 , one each on an opposite side of the middle tooth claim 1 , the middle tooth and two side teeth extending from a base to form an E-shaped profile.4. The position sensor of claim 3 , wherein the middle tooth had a first width and each of the two side teeth have a second width claim 3 , wherein the first width is twice the second width.5. The position sensor of claim 3 , wherein a side tooth of one E-shaped ferromagnetic core entirely overlaps a side tooth of an adjacent E-shaped ferromagnetic core.6. The position sensor of claim 1 , wherein a first set of the plurality of E-shaped ferromagnetic cores are arranged in a first plane and a second set of the plurality of ...

Electromagnetic Levitator

A levitator is disclosed. The levitator may include a repulsion wire coil having a vertical coil axis, a position control wire coil having a vertical coil axis, a rotation control wire coil having a horizontal coil axis, and a controller coupled to each of the repulsion wire coil, position wire coil, and rotation wire coil, where the controller is configured to independently control currents provided to each of the repulsion wire coil, position wire coil, and rotation wire coil to levitate an item. 1. A levitator , comprising:a repulsion wire coil having a vertical coil axis;a position control wire coil having a vertical coil axis;a rotation control wire coil having a horizontal coil axis; anda controller coupled to each of the repulsion wire coil, position wire coil, and rotation wire coil, wherein the controller is configured to independently control currents provided to each of the repulsion wire coil, position wire coil, and rotation wire coil.2. The levitator of claim 1 , comprising:a position sensor that senses the position of a levitated item,wherein the current provided to each of the repulsion wire coil, position wire coil, and rotation wire coil is based on the position of the levitated item.3. The levitator of claim 2 , wherein the position sensed by the position sensor includes the linear position and angular position of the levitated item.4. The levitator of claim 2 , wherein the position sensor is a magnetic field sensor.5. The levitator of claim 2 , wherein the position sensor has a variable output based on the strength of an incident magnetic field.6. The levitator of claim 2 , wherein the position sensor is a Hall-effect sensor.7. The levitator of claim 1 , comprising a plurality of position sensors that together sense the position of a levitated item claim 1 ,wherein the current provided to each of the repulsion wire coil, position wire coil, and rotation wire coil is based on the position of the levitated item.8. The levitator of claim 1 , ...

MAGNETIC BEARING DEVICE

When a duration of current noise caused by a PWM control of each excitation amplifier is Td, a cycle of a PWM carrier signal is Tpwm, an on-duty upper limit of the PWM carrier signal under quiet environment without disturbance is Tonu, and an on-duty lower limit of the PWM carrier signal under the quiet environment without the disturbance is Tonl, the AD sampling period includes a first AD sampling period between a point after a lapse of the time Td after a start of the cycle Tpwm and a point after a lapse of a time (Tpwm−Tonu) from the start of the cycle Tpwm, and a second AD sampling period between a point after a lapse of a time (Tpwm−Tonl+Td) from the start of the cycle Tpwm and an end point of the cycle Tpwm. 1. A magnetic bearing device comprising:a pair of electromagnets provided for each of multiple control axes and arranged to face each other with respect to a rotor shaft;a plurality of excitation amplifiers configured to supply an electromagnet current to each electromagnet;a plurality of current sensors each configured to detect the electromagnet current to output a current detection signal; anda controller configured to AD-sample (i) the current detection signal based on the electromagnet current on which a carrier signal for detecting a change in a levitation position of the rotor shaft is superimposed, and a sum signal of the current detection signals of the pair of electromagnets, or (ii) the current detection signal, and a modulated signal produced by modulating a carrier signal based on the levitation position, in a predetermined AD sampling period to obtain displacement information on the levitation position change, thereby performing PWM control of each excitation amplifier based on the displacement information, a first AD sampling period between a point after a lapse of the time Td after a start of the cycle Tpwm and a point after a lapse of a time (Tpwm−Tonu) from the start of the cycle Tpwm, and', 'a second AD sampling period between a point ...

MAGNETIC BEARING SYSTEMS AND METHODS OF CONTROLLING THE SAME

A magnetic bearing system includes a first electromagnet, a second electromagnet opposing the first electromagnet, and a rotor positioned between the first and second electromagnets. The first and second electromagnets are configured to apply a magnetic force. The system also includes a controller configured to determine a control action necessary to move the rotor to a predetermined rotor setpoint. The system further includes a nonlinear compensation device configured to calculate a first electrical current setpoint for the first electromagnet and a second electrical current setpoint for the second electromagnet to maintain a predetermined stiffness during at least one of startup, operation, and shutdown of the magnetic bearing system. The first and second electrical current setpoints are calculated based on the control action determined by the controller. 1. A magnetic bearing system comprising:a first electromagnet and a second electromagnet opposing said first electromagnet, said first and second electromagnets configured to apply a magnetic force;a rotor positioned between said first electromagnet and said second electromagnet;a controller configured to determine a control action necessary to move said rotor to a predetermined rotor setpoint; anda nonlinear compensation device configured to calculate a first electrical current setpoint for said first electromagnet and a second electrical current setpoint for said second electromagnet to maintain a predetermined stiffness during at least one of startup, operation, and shutdown of said magnetic bearing system, wherein said first and second electrical current setpoints are calculated based on the control action determined by said controller.2. A magnetic bearing system in accordance with claim 1 , wherein said nonlinear compensation device creates a substantially constant resultant stiffness of said first and second electromagnets independent of an air gap distance between said first and second electromagnets and ...

Radial position sensor

This radial position sensor measures the radial position of a rotor within a stator. The sensor provides measuring means for measuring the position of the rotor along a first axis radial to a rotation axis of the rotor and along a second axis perpendicular to the first axis. The measuring means includes four magnetic poles, among which two poles are diametrically opposed along the first axis and two other poles are diametrically opposed along the second axis, the magnetic poles distributed, on the inner surface of the stator, with alternating magnetic polarities around the circumference of the stator. Alternatively, the measuring means includes eight magnetic poles distributed, on the inner surface of the stator, with alternating magnetic polarities around the circumference of the stator and are arranged so that each pole deviates by an angle of approximately 30° from the nearest axis among the first axis and the second axis. 1. A radial position sensor for measuring the radial position of a rotor within a stator , the sensor comprising: [{'b': 1', '3', '2', '4, 'four magnetic poles, among which two poles (Z, Z) are diametrically opposed along the first axis (X) and two other poles (Z, Z) are diametrically opposed along the second axis (Y), the magnetic poles being distributed, on the inner surface of the stator, with alternating magnetic polarities (N, S) around the entire circumference of the stator, or'}, {'b': 1', '4', '1', '8, 'eight magnetic poles (Z:Z; Z:Z) that are distributed, on the inner surface of the stator, with alternating magnetic polarities (N, S) around the entire circumference of the stator and that are arranged so that each pole deviates by an angle of approximately 30° from the nearest axis among the first axis (X) and the second axis (Y).'}], 'measuring means configured for measuring the position of the rotor along a first axis (X) radial to a rotation axis (Z-Z′) of the rotor and along a second axis (Y) perpendicular to the first axis, and ...

ELECTRIC MACHINE HAVING AN AXIAL ELECTRODYNAMIC BEARING

The invention relates electric machine extending along an axis Z, and comprising (i) a rotor portion configured for rotating around the Z axis at a defined position along the Z axis, and comprising a field source having p pole pairs; (ii) a stator portion comprising at least one pair of windings comprising each an upper () and a lower () winding, comprising each a plurality of p pole pairs, the upper () and lower () winding being arranged so as to form a passive axial electrodynamic bearing. According to the invention, the connections (-- or --) between the upper () and lower () windings comprise terminals of the electric machine connectable to an electric power supply or to an electric load. 1. An electric machine extending along an axis Z , and comprising:1) a rotor portion configured for rotating around the Z axis at a defined position along the Z axis and comprising a field source having an upper field source arrangement and a lower field source arrangement producing a magnetic field, and comprising a plurality of p pole pairs uniformly distributed around the Z axis; [ (a) a flux from the field source in said upper winding is equal to the flux from the field source in said lower winding; or', '(b) a flux from the field source in said upper winding is opposite to the flux from the field source in said lower winding;, 'each winding and the field source are arranged in such a way that either alternative, 'is realized at any time when the rotor portion rotates around the Z axis at said defined position along the Z axis;', 'each winding and the field source are arranged in such a way that the amplitude of a flux from the field source increases in a winding of said pair of windings and decreases in the other winding of said pair of windings when position of the rotor portion along the Z axis is different from said defined position;', 'the positive reference terminal of the upper winding is connected to the positive reference terminal of the lower winding and the ...

CIRCULATING DIELECTRIC OIL COOLING SYSTEM FOR CANNED BEARINGS AND CANNED ELECTRONICS

A cooling system for a rotating machine, such as a centrifugal compressor. Specifically, the cooling system may be configured to cool radial and axial magnetic bearings in the rotating machine and the bearing control system that controls said bearings. The cooling system includes canned magnetic radial bearings on each end of the rotor and a canned bearing control system. The canned bearings and canned bearing control system may be filled with a dielectric cooling fluid and in fluid communication with each other via sealed conduits. Accordingly, the radial magnetic bearings and the bearing control system may be entirely immersed in the dielectric cooling fluid to regulate heat generation. An axial magnetic bearing may also be canned and fluidly coupled to the cooling system to immerse the axial magnetic bearing in the dielectric cooling fluid. 1. A cooling system for a rotating machine , comprising:a first radial bearing housing arranged about a rotor and having a first radial magnetic bearing sealed therein for levitating the rotor;a second radial bearing housing arranged about the rotor and having a second radial magnetic bearing sealed therein for levitating the rotor;a sealed controller can fluidly coupled to the first and second radial bearing housings and having a bearing control system disposed therein; anda coolant within the first and second radial bearing housings and the controller can such that the first and second radial magnetic bearings and the bearing control system are immersed in the coolant.2. The system of claim 1 , wherein the coolant within the first and second radial bearing housings is a dielectric cooling liquid and the coolant within the controller can is a dielectric gas.3. The system of claim 1 , wherein the coolant is a dielectric cooling liquid.4. The system of claim 1 , further comprising:a first sealed conduit providing fluid communication between the controller can and the first radial bearing housing;a second sealed conduit ...

CENTRIFUGAL PUMP AND A PUMP HOUSING

A centrifugal pump for conveying a fluid, includes a pump housing, a rotor configured to convey the fluid disposed within the housing; and a stator which, together with the rotor, forms an electromagnetic rotary drive configured to rotate the rotor about an axial direction. The stator is a bearing and drive stator with which the rotor capable of being magnetically driven without contact and magnetically levitated without contact with respect to the stator. The rotor is passively magnetically levitated in the axial direction, and actively magnetically levitated in a radial plane perpendicular to the axial direction. The pump housing includes comprising a bottom and a cover, and the rotor is arranged in the pump housing between the bottom and the cover with respect to the axial direction. An indentation is disposed in the bottom or in the cover, the indentation being configured to generate a local turbulence. 1. A centrifugal pump for conveying a fluid , comprising:a pump housing;a rotor configured to convey the fluid disposed within the housing; anda stator which, together with the rotor, forms an electromagnetic rotary drive configured to rotate the rotor about an axial direction,the stator being a bearing and drive stator with which the rotor is capable of being magnetically driven without contact and magnetically levitated without contact with respect to the stator,the rotor being passively magnetically levitated in the axial direction, and actively magnetically levitated in a radial plane perpendicular to the axial direction,the pump housing comprising a bottom and a cover, and the rotor being arranged in the pump housing between the bottom and the cover with respect to the axial direction, at least one indentation is disposed in the bottom or in the cover, the indentation being configured to generate a local turbulence.2. The centrifugal pump according to claim 1 , wherein the rotor comprises an annular or disk-shaped magnetically effective core claim 1 , and an ...

ELECTRIC MAGNETIC MOTOR

An electric magnetic motor comprises a motor; a rotating shaft which is connected to the motor; a rotating device including a rotating disk and a plurality of magnetic members, the rotating disk being kinetically connected to the motor through the rotating shaft, wherein the plurality of magnetic members are annularly arranged at an outer periphery of the rotating disk, each magnetic member is arranged in a manner that a magnetic moment direction thereof is magnetic diverging from a radial direction of the rotating disk; and a fixed ring, including a plurality of corresponding magnetic members, the plurality of corresponding magnetic members being annularly arranged on the fixed ring in a manner that a magnetic repulsion reaction is generated between the corresponding magnetic members and the magnetic members. 1. An electric magnetic motor , comprising:a motor;a rotating shaft which is laterally connected to the motor;a rotating device including a plurality of rotating disks and a plurality of magnetic members, the plurality of rotating disks being laterally run through by and connected with the rotating shaft in a manner that each rotating disk and the rotating shaft are coaxial, the plurality of rotating disks being kinetically connected to the motor through the rotating shaft such that the motor is powered by receiving electricity to rotate the rotating shaft so as to drive the rotating device, wherein the plurality of magnetic members are annularly arranged at an outer periphery of each rotating disk, each magnetic member is arranged in a manner that a magnetic moment direction of each magnetic member is magnetic diverging in a magnetic moment diverging angle from a radial direction of each rotating disk, and the magnetic members of the neighboring rotating disks in the same lateral line are interleaved arranged; anda plurality of fixed rings, each of the fixed rings neighboring to one rotating disk and arranged at an outer periphery of said one rotating disk, ...

ELECTROSTATIC STABILIZER FOR A PASSIVE MAGNETIC BEARING SYSTEM

Electrostatic stabilizers are provided for passive bearing systems composed of annular magnets having a net positive stiffness against radial displacements and that have a negative stiffness for vertical displacements, resulting in a vertical instability. Further embodiments are shown of a radial electrostatic stabilizer geometry (using circuitry similar to that employed in the vertical stabilizer). This version is suitable for stabilizing radial (lateral) displacements of a rotor that is levitated by annular permanent magnets that are stable against vertical displacements but are unstable against radial displacements. 1. An apparatus , comprising:a right cylindrical rotor configured for rotation about a longitudinal axis, wherein said rotor comprises a metallic outer cylindrical surface;a passive magnetic bearing system configured to provide at least axial stabilization of said rotor as said rotor rotates;a first plurality of pairs of electrodes, wherein each electrode of each pair of said pairs is spaced from each other electrode and from said metallic outer cylindrical surface, wherein said plurality of pairs of electrodes are spaced around said metallic outer cylindrical surface;at least one individual inductor connected to each pair of said first plurality of pairs of electrodes; andat least one source of RF voltage connected across each pair of said plurality of pairs of electrodes.2. The apparatus of claim 1 , wherein said first plurality of pairs of electrodes comprises four pairs of stationary curved electrodes claim 1 , the azimuthal width of which of is about 45° less the space between each electrode of each pair of said pairs.3. The apparatus of claim 1 , further comprising:a second plurality of pairs of electrodes spaced from said first plurality of pairs of electrodes, wherein each electrode of each pair of said second plurality of pairs is spaced from each other and from said metallic outer cylindrical surface, wherein said second plurality of pairs ...

Methods Of Operating A Rotary Blood Pump

Various “contactless” bearing mechanisms including hydrodynamic, hydrostatic, and magnetic bearings are provided for a rotary pump as alternatives to mechanical contact bearings. These design features may be combined. In one embodiment, the pump apparatus includes a rotor having a bore, a ring-shaped upper rotor bearing magnet, and a ring-shaped lower rotor bearing magnet. The bearing magnets are concentric with the bore. The lack of mechanical contact bearings enables longer life pump operation and less damage to working fluids such as blood. 1. A method of assembling a centrifugal fluid pump comprising:disposing a rotor in a housing having a center-post for rotation of said rotor around said center-post;forming a magnet assembly for magnetically biasing said rotor in a first direction;configuring at least one ring-shaped center-post magnet and at least one ring-shaped rotor magnet for providing a stabilizing force to said rotor during operation; andpositioning said rotor in proximity to said housing such that hydrodynamic forces are created in opposition to said biasing during rotation of said rotor.2. A method according to claim 1 , wherein the disposing comprises disposing said rotor in said housing to form a leakage flow path between said rotor and said housing assembly.3. A method according to claim 1 , wherein said positioning comprises placing said rotor in proximity to contoured hydrodynamic surfaces.4. A method according to claim 3 , wherein said positioning further comprises placing said rotor in proximity to contoured hydrodynamic surfaces formed on a surface of said housing assembly.5. A method according to claim 1 , further comprising adjusting the relative position of said at least one ring-shaped center-post magnet and said at least one ring-shaped rotor magnet so as to fine tune the biasing of said rotor axially in said first direction.6. A method according to claim 4 , wherein said adjusting includes axially moving said at least one ring-shaped ...

Control Device for Magnetic Bearing and Control Method

The present invention is to reduce the load on a control device by reliably classifying vibration modes of a rotor, thereby facilitating stabilization design of a magnetic bearing. The present invention includes: magnetic bearings including electromagnets provided at one end and the other end of a rotor to contactlessly support the one end and the other end of the rotor by the magnetic attraction forces of the electromagnets; and displacement sensors that measure an inclination at the one end of the rotor and an inclination at the other end of the rotor, in which the magnetic attraction forces of the electromagnets are controlled based on the inclinations measured by the displacement sensors. 1. A control device for a magnetic bearing , comprising:a magnetic bearing including electromagnets at one and the other end sides of a shaft member and supporting the one and the other end sides of the shaft member contactlessly by a magnetic attraction force of the electromagnets; andan inclination measuring device that measures a first inclination at the one end side of the shaft member and a second inclination on the other end side of the shaft member, whereinthe control device controls the magnetic attraction force of the electromagnets based on the first inclination and the second inclination measured by the inclination measuring device.2. The control device for a magnetic bearing according to claim 1 , wherein the inclination measuring device includesa first displacement sensor provided at the one end side of the shaft member,a second displacement sensor provided adjacent to the first displacement sensor in an axial direction of the shaft member,a third displacement sensor provided at the other end side of the shaft member, anda fourth displacement sensor provided adjacent to the third displacement sensor in the axial direction of the shaft member.3. The control device for a magnetic bearing according to claim 2 , wherein the inclination measuring device includes an ...

MAGNETIC THRUST BEARINGS

Rotating machines and magnetic thrust bearings therefor are disclosed. Magnetic thrust bearings may include a rotor core configured to extend coaxially around a shaft of a rotating machine, a non-magnetic element configured to be coaxially disposed on the shaft, and a stator comprising a stator core and a coil, both of which are configured to extend coaxially around the axis. The rotor core may include a substantially radially extending thrust face and a substantially axially extending peripheral surface. The non-magnetic element may radially space the thrust face from the shaft. The stator core may include a substantially radially extending first pole surface and a substantially axially extending second pole surface. The first pole surface may define an axial air gap with the thrust face, and the second pole surface may define a radial air gap with the peripheral surface. 1. A magnetic thrust bearing for a rotating machine having a shaft extending along an axis , the magnetic thrust bearing comprising:a rotor core configured to extend coaxially around the shaft, the rotor core having a substantially radially extending thrust face and a substantially axially extending peripheral surface;a non-magnetic element configured to be coaxially disposed on the shaft, wherein the non-magnetic element radially spaces the thrust face from the shaft; anda stator comprising a stator core and a coil both configured to extend coaxially around the axis, wherein the stator core comprises a substantially radially extending first pole surface and a substantially axially extending second pole surface, the first pole surface defines an axial air gap with the thrust face, and the second pole surface defines a radial air gap with the peripheral surface.2. The magnetic thrust bearing of claim 1 , wherein the thrust face is perpendicular to the axis.3. The magnetic thrust bearing of claim 1 , wherein the peripheral surface extends parallel to the axis.4. The magnetic thrust bearing of claim ...

TURBOMACHINE WITH ACTIVE MAGNETIC BEARINGS

An active magnetic bearing system includes a radial actuator and an axial actuator. The radial actuator includes a radial stator coupled to a stationary component, and a radial rotor coupled to a rotatable impeller. The radial rotor extends circumferentially with respect to the radial stator and is configured to rotate about the radial stator. The axial actuator has first and second rotor rings and first and second stators. The first rotor ring is attached to a first axial end of the impeller, and the second rotor ring is attached to a second axial end of the impeller. The first and second stators are coupled to the shaft adjacent the first and second rotor rings, respectively. The radial actuator is positioned axially between the first and second rotor rings. 1. An active magnetic bearing system comprising:a radial actuator comprising a radial stator coupled to a stationary component, and a radial rotor coupled to a rotatable impeller, said radial rotor extending circumferentially with respect to said radial stator and configured to rotate thereabout; andan axial actuator comprising a first rotor ring, a second rotor ring, a first stator, and a second stator, said first rotor ring coupled to a first axial end of the rotatable impeller, said second rotor ring coupled to a second axial end of the rotatable impeller opposite the first axial end, said first stator coupled to the stationary component adjacent said first rotor ring in a face-to-face orientation, and said second stator coupled to the stationary component adjacent said second rotor ring in a face-to-face orientation, wherein said radial actuator is positioned axially between said first rotor ring and said second rotor ring.2. An active magnetic bearing system in accordance with claim 1 , wherein said radial actuator is a fault tolerant actuator claim 1 , said radial stator comprising at least six adjacent electromagnets configured such that each electromagnet is positioned opposite a corresponding ...

SEALLESS DOWNHOLE SYSTEM WITH MAGNETICALLY SUPPORTED ROTOR

A fluid rotor is configured to move or be rotated by a working fluid. A fluid stator surrounds the fluid rotor. The fluid stator is spaced from the fluid rotor and defines a first annular fluid gap in-between that is in fluid communication with an outside environment exterior the downhole-type pump. A radial magnetic bearing includes a first portion coupled to the fluid rotor and a second portion coupled to the fluid stator. The first portion is spaced from the second portion defining a second annular fluid gap in-between that is in fluid communication with the outside environment exterior the downhole-type pump. 1. A downhole-type pump comprising:a fluid rotor configured to move or be rotated by a working fluid;a fluid stator surrounding the fluid rotor, the fluid stator spaced from the fluid rotor and defining a first annular fluid gap in-between that is in fluid communication with an outside environment exterior the downhole-type pump; anda radial magnetic bearing comprising a first portion coupled to the fluid rotor and a second portion coupled to the fluid stator, the first portion spaced from the second portion defining a second annular fluid gap in-between that is in fluid communication with the outside environment exterior the downhole-type pump.2. The downhole-type pump of claim 1 , wherein the magnetic radial bearing comprises an active magnetic bearing.3. The downhole-type pump of claim 1 , wherein the magnetic radial bearing comprises a passive magnetic bearing.4. The downhole-type pump of claim 1 , further comprising a fluid-end housing and where the fluid rotor claim 1 , the fluid stator claim 1 , and magnetic radial bearing reside within the fluid-end housing.5. The downhole-type pump of claim 1 , wherein a process fluid flow flows through the second annular fluid gap.6. The downhole-type pump of claim 1 , wherein the second annular fluid gap is configured to cool the radial magnetic bearing.7. The downhole-type pump of claim 1 , wherein the fluid ...

ELONGATED PERMANENT RING MAGNET WITH A PLURALITY OF AXIALLY DIRECTED MAGNETIZED ZONES AND MAGNETIC BEARING WITH SUCH A RING MAGNET

The present invention is directed to a magnet for a magnetic bearing arrangement, a bearing arrangement comprising said magnet, and a vacuum pump comprising said bearing arrangement. In particular the invention can be particularly useful in a magnetic bearing arrangement that reduces stray magnetic fields for a turbomolecular vacuum pump, although it is understood that the invention is not limited to this field and other applications will be understood by the skilled person. 1. A single piece elongate permanent ring magnet for a magnetic bearing used in rotating machinery , whereby , in use said bearing has an axis of rotation parallel with , and centrally through the bore of the ring magnet , wherein the magnet comprises an even number of axially polarized zones between the axial ends of the magnet , with axially neighbouring polarized zones in mutual repulsion to each other.2. The single piece elongate permanent ring magnet of claim 1 , comprising at least four axially polarized zones.3. The single piece ring magnet of claim 1 , included in a magnetic bearing arrangement having a rotating magnet and a non-rotating magnet in which the single piece ring magnet concentrically surrounds the non-rotating magnet and wherein the non-rotating magnet is a single piece elongate permanent ring magnet comprising an even number of axially polarized zones between the axial ends of the magnet claim 1 , with axially neighbouring polarized zones in mutual repulsion to each other and wherein the axially polarized zones on the rotating and non rotating magnet are orientated to provide a mutual repulsion between the rotating and non-rotating magnets.4. The magnetic bearing arrangement of claim 3 , wherein the rotating magnet with the single piece ring magnet concentrically surrounds the non-rotating magnet claim 3 , and wherein the non-rotating magnet comprises an array of axially polarised a permanent ring magnets with axially neighbouring rings in mutual repulsion w each other and ...

AXIAL GAP GENERATOR FOR POWERING A MAGNETIC BEARING

A device includes a rotor to rotate about a longitudinal axis, a magnetic bearing actuator, and an axial gap generator including a stator assembly adjacent to the rotor, the axial gap generator to generate an amount of power as a function of a gap spacing between the stator assembly and the rotor, the gap spacing parallel to the longitudinal axis, and the axial gap generator to supply the amount of power to a control coil of the magnetic bearing actuator. 1. A device , comprising:a rotor configured to rotate about a longitudinal axis;a magnetic bearing actuator comprising a control coil positioned adjacent to the rotor and configured to impart a force on the rotor parallel to the longitudinal axis; andan axial gap generator comprising a stator assembly adjacent to the rotor and electrically connected to the control coil of the magnetic bearing actuator with a wired connection, the axial gap generator configured to generate an amount of power as a function of a gap spacing between the stator assembly and the rotor, the gap spacing parallel to the longitudinal axis, the axial gap generator configured to supply the amount of power to the control coil of the magnetic bearing actuator over the wired connection, where the control coil is a recipient of the amount of power from the axial gap generator.2. (canceled)3. The device of claim 1 , where the stator assembly is positioned adjacent a first side of the rotor and the control coil is positioned adjacent a second side of a rotor pole of the rotor opposite the first side claim 1 , and in response to a displacement of the rotor in a first longitudinal direction that decreases the gap spacing claim 1 , the amount of power from the stator assembly to the control coil increases and the magnetic bearing actuator is configured to apply a force on the rotor in a second longitudinal direction opposite the first longitudinal direction based on the amount of power received by the control coil.4. The device of claim 1 , comprising ...

METHOD OF MANUFACTURING A LAMINATION STACK FOR USE IN AN ELECTRICAL MACHINE

A lamination stack for use in a rotating electrical machine includes a plurality of sheets of ferritic material. Each of the sheets has first and second sides that include asperities, and the asperities have a height of about two microns and a width of about two microns. A layer of electrically insulating material is provided between adjacent pairs of the ferritic sheets in the stack, and the asperities extend into the electrically insulating material. 1. A lamination stack for use in a rotating electrical machine , the lamination stack being formed by a method comprising:providing a plurality of sheets of ferritic material, each of the sheets having a first side and a second side and a thickness from the first side to the second side, the first and second sides having asperities each having a height of about two microns;coating at least one side of each sheet with a chemically protective electrically insulating material;stacking the coated sheets;compressing the stack of the coated sheets;heating the compressed stack of coated sheets at a temperature above a melting temperature of the insulating material; andcooling the compressed stack.2. The lamination stack according to claim 1 ,wherein the asperities each have a width of about two microns.3. The lamination stack according to claim 1 ,wherein coating at least one side of each sheet with a chemically protective electrically insulating material comprises applying a solid powder to the at least one side of each sheet.4. The lamination stack according to claim 3 ,wherein the solid powder has a grain size of about 5 to 10 microns.5. The lamination stack according to claim 1 ,wherein the electrically insulating material comprises a Fluorinated Ethylene Propylene.6. The lamination stack according to claim 1 ,wherein the electrically insulating material comprises a Perfluoroalkoxy Alkane.7. An electrical machine comprising:a bearing rotor; anda bearing stator,{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'wherein ...

ELECTRO-MAGNETIC BEARING ASSEMBLY WITH INNER VENTILATION TO COOL THE BEARING

A magnetic bearing assembly for a rotary machine, having a rotor circuit and a stator magnetic circuit secured to a stationary support element having at least one body of ferromagnetic material and at least one coil, both being fitted in a protective annular housing leaving uncovered a surface of revolution of said ferromagnetic body and a surface of revolution of said one coil facing a surface of revolution of the rotor circuit. The bearing assembly comprises at least one row of blades secured on the rotor circuit. 1. A magnetic bearing assembly for a rotary machine , comprising:a rotor circuit and a stator magnetic circuit secured to a stationary support element having at least one body of ferromagnetic material and at least one coil, both being fitted in a protective annular housing leaving uncovered a surface of revolution of said ferromagnetic body and a surface of revolution of said one coil facing a surface of revolution of the rotor circuit, characterized in that wherein the bearing assembly comprises at least one row of blades secured on the rotor circuit.2. A bearing assembly according to claim 1 , wherein said one row of blades comprises a plurality of blades extending from the rotor circuit.3. A bearing assembly according to claim 1 , wherein the rotor circuit comprises an annular thrust collar having an axial portion secured to a rotor shaft and radially extending towards the stator magnetic circuit by a radial portion claim 1 , said radial portion facing the uncovered surfaces of said ferromagnetic body and said one coil.4. A bearing assembly according to claim 3 , wherein the row of blades is secured to the annular thrust collar and extends radially from the annular thrust collar towards the stator magnetic circuit.5. A bearing assembly according to any of the claim 3 , wherein the bearing is an axial magnetic bearing.6. A bearing assembly according to claim 1 , where in the bearing is a radial magnetic bearing.7. A bearing assembly according to claim ...

Rotary Blood Pump With Opposing Spindle Magnets, Bore And Drive Windings

Various “contactless” bearing mechanisms including hydrodynamic and magnetic bearings are provided for a rotary pump as alternatives to mechanical contact bearings. In one embodiment, a pump apparatus includes a pump housing defining a pumping chamber. The housing has a spindle extending into the pumping chanber. A spindle magnet assembly includes first and second magnets disposed within the spindle. The first and second magnets are arranged proximate each other with their respective magnetic vectors opposing each other. The lack of mechanical contact bearings enables longer life pump operation and less damage to working fluids such as blood. 1. A centrifugal blood pump comprising:a pump housing defining a pumping chamber;a center post extending into said pumping chamber;a rotor configured to rotate around said center post;said rotor being biased axially in a first direction when said rotor is in a non-rotating state;a plurality of contoured surfaces disposed between said housing and said rotor so as to create a hydrodynamic bearing which generates forces in a direction parallel to said first direction when said rotor is in a rotating state;a passive axial magnetic bearing supportive of said rotor;a plurality of drive magnets disposed in said rotor;said passive axial magnetic bearing being adjustable so as to modify the bias of said rotor in said first direction.2. A pump according to claim 1 , wherein said contoured surfaces are curved and tapered ramps.3. A pump according to claim 2 , wherein said contoured surfaces are disposed on said rotor.4. A pump according to claim 1 , wherein said passive axial magnetic bearing comprises a center post component and a rotor component claim 1 , one of which is axially adjustable relative to the other.5. A pump according to wherein said hydrodynamic bearing generates forces in a direction parallel and opposite to said first direction when said rotor is in a rotating state.6. A pump according to claim 4 , wherein said rotor ...

Permanent Magnet Thrust Bearing

A magnetic thrust bearing is designed for use in a pumping system that includes a pump driven by a motor through a shaft. The magnetic thrust bearing includes one or more platters that remain stationary with respect to the shaft and one or more thrust discs connected to the shaft and interleaved with the one or more platters. Each of the one or more platters includes a plurality of platter magnets and each of the one or more thrust discs includes a plurality of thrust disc magnets. The magnets on the platters and thrust discs are configured to produce repulsive magnetic forces as the thrust discs approach the platters.

HIGH PRESSURE RATIO MULTI-STAGE CENTRIFUGAL COMPRESSOR

A heat pump system includes a refrigerant circuit. First and second heat exchangers are arranged in the refrigerant circuit. A flow reversing device selectively changes a direction of flow in the refrigerant circuit between the first and second heat exchangers. A centrifugal compressor is arranged in the fluid circuit and has first and second impellers arranged in series relative to one another to provide a desired compressor pressure ratio. In one example, the centrifugal compressor mounts the first and second impellers on opposing ends of a shaft. The first and second impellers respectively include first and second stage inlets and outlets. One example desired compressor pressure ratio of at least 10:1 corresponds to a second stage outlet pressure to a first stage inlet pressure. A first diffuser is arranged at the first stage outlet, and the first diffuser is a variable geometry diffuser. 1. A heat pump system comprising:a refrigerant circuit;first and second heat exchangers arranged in the refrigerant circuit;a flow reversing device selectively changing a direction of flow in the refrigerant circuit between the first and second heat exchangers; anda centrifugal compressor arranged in the fluid circuit and having first and second impellers arranged in series relative to one another and providing a desired compressor pressure ratio.2. The heat pump system according to claim 1 , wherein the first and second impellers respectively include first and second stage inlets and outlets claim 1 , and the desired compressor pressure ratio corresponds to a second stage outlet pressure to a first stage inlet pressure.3. The heat pump system according to claim 2 , wherein the desired compressor pressure ratio is about 10:1.4. The heat pump system according to claim 2 , wherein the compressor includes first and second diffusers respectively arranged at the first and second stage outlets.5. The heat pump system according to claim 4 , wherein the first and second diffusers are ...

Rotary machine having magnetic and mechanical bearings

A rotary machine provides a stator having a stator casing, and a rotor shaft having a rotational axis and supported in the stator casing by at least one radial magnetic bearing. The rotary machine further provides an axial mechanical thrust bearing being disposed proximate a radial surface of one end of the rotor shaft, the axial mechanical thrust bearing, including a rolling element located on the rotational axis of the rotor shaft. 1. A rotary machine comprising:a stator having a stator casing, anda rotor shaft having a rotational axis (X-X) and supported in the stator casing by at least one radial magnetic bearing, andan axial mechanical thrust bearing being disposed proximate a radial surface of one end of the rotor shaft, the axial mechanical thrust bearing having a rolling element located on the rotational axis (X-X) of the rotor shaft.2. The rotary machine according to claim 1 , wherein the rolling element is in direct axial contact with one end of the rotor shaft so that the rotor shaft rotates permanently on the rolling element.3. The rotary machine according to claim 1 , wherein the axial mechanical thrust bearing is in axial contact with one end of the rotor shaft and provides a bearing mounted between a stator plate and one end of the rotor shaft and designed to support the rotor weight claim 1 , the stator plate being supported by the rolling element.4. The rotary machine according to claim 3 , wherein the stator plate is fixed to the stator casing by elastic means.5. The rotary machine according to claim 4 , wherein the elastic means comprises at least three springs claim 4 , each spring being fixed to the circumference of the stator plate and an inner circumference of the stator casing.6. The rotary machine according to claim 4 , wherein the elastic means comprises an O-ring radially surrounding the stator plate.7. The rotary machine according to claim 3 , wherein the bearing comprises an inner ring mounted on the stator plate claim 3 , an outer ring ...

ROTARY ASSEMBLY WITH MAGNETIC BEARING

The present invention relates to a rotary assembly (), in particular for a rheological measurement apparatus, comprising: 1. A rotary assembly , in particular for a rheological measurement apparatus , comprising:a stator,a rotor rotatable with respect to the stator, the rotor being axially retained by a flexible rod configured to be attached to a frame for preventing movement of the rotor along an axis of rotation thereof, the flexible rod allowing a radial movement of the rotor,a magnetic bearing comprising a rotor element made of magnetic material mounted on the rotor and a stator element made of magnetic material mounted on the stator, at least one of the rotor and stator elements made of magnetic material being a spherical magnet,wherein the rotary assembly has a stable position in which the rotor is aligned with the axis of rotation thereof and the elements made of magnetic material are facing each other along the axis of rotation of the rotor and are separated from each other by a given distance, and wherein the elements made of magnetic material are configured to attract each other, so as to generate a return force which opposes the axial misalignment of said rotor.2. The rotary assembly of claim 1 , wherein the rotor element and the stator element both comprise magnets.3. The rotary assembly of claim 1 , wherein the rotor element and the stator element are aligned along the axis of rotation of the rotor when the rotary assembly is in the stable position.4. The rotary assembly of claim 1 , wherein the rotor element and/or the stator element are permanent magnets.5. The rotary assembly of claim 1 , wherein the rotor element and/or the stator element are electromagnets.6. The rotary assembly of claim 1 , wherein the rotor and stator elements each form a magnetic dipole and wherein claim 1 , when the rotor is in the stable position claim 1 , the rotor and stator magnetic dipoles are aligned with each other along the axis of rotation of the rotor and are oriented ...

MECHANICAL BACKUP BEARING ARRANGEMENT FOR A MAGNETIC BEARING SYSTEM

The present disclosure describes a mechanical backup bearing system arrangement to work in conjunction with non-contact magnetic bearings and capable of coping with thermal expansions of the bearing components during operations. Expansions or contractions of an inner or outer race of a bearing can be compensated using particular springs providing a low profile and a proper stiffness. An electric machine system includes a rotational portion and a stationary portion. The electric machine further includes a magnetic bearing configured to support the rotational portion to rotate within the stationary portion. A mechanical back-up bearing resides in a cavity between the rotational portion and the stationary portion. A flat spring is carried by the stationary portion and abutting the back-up bearing. 1. An electric machine system comprising:a rotational portion and a stationary portion;a magnetic bearing configured to support the rotational portion to rotate within the stationary portion;a mechanical back-up bearing residing in a cavity between the rotational portion and the stationary portion; anda flat spring carried by the stationary portion and abutting the back-up bearing.2. The electric machine system of claim 1 , wherein the back-up bearing further comprises:an inner backup bearing race that comes in contact with the rotational portion when the rotational portion is not supported by the magnetic bearing; andan outer backup bearing race carried by the stationary portion, the outer race and the inner race encasing backup bearing balls; and wherein the flat spring contacts the lateral side of the outer race.3. The electric machine system of claim 2 , wherein the flat spring is configured to deflect upon an axial movement of the lateral side of the outer race.4. The electric machine system of claim 2 , wherein the flat spring applies a preloaded force to the outer race.5. The electric machine system of claim 1 , further comprising a retainer clamping the flat spring ...

ROTARY PUMP WITH THRUST BEARINGS

A rotary blood pump includes a casing defining a pumping chamber. The pumping chamber has a blood inlet and a tangential blood outlet. One or more motor stators are provided outside of the pumping chamber. A rotatable impeller is within the pumping chamber and is adapted to cause blood entering the pumping chamber to move to the blood outlet. The impeller has one or more magnetic regions. The impeller is radially constrained in rotation by magnetic coupling to one or more motor stators and is axially constrained in rotation by one or more hydrodynamic thrust bearing surfaces on the impeller. 1. A rotary blood pump comprising:A housing defining a pumping chamber with upper and lower interior surfaces and having a blood inlet and a tangential blood outlet;A rotatable impeller within said pumping chamber and adapted to increase blood pressure within said pumping chamber to cause blood to move to said blood outlet, said impeller having at least one raised surface area adjacent said upper interior surface of said pumping chamber;a first tapered region of said raised surface area having a leading portion and a trailing portion such that a gap between said first tapered region and said upper interior surface of said housing decreases from said leading portion to said trailing portion to create a hydrodynamic thrust load acting to bias said impeller axially away from said upper interior surface of said housing when said impeller is rotating, each of said first tapered regions having a shroud extending from said leading portion to said trailing portion along each of its inner and outer boundaries.218-. (canceled) This application claims the benefit of U.S. Provisional Applications Nos. 60/758,793, filed Jan. 13, 2006; 60/758,892, filed Jan. 13, 2006; 60/758,795, filed Jan. 13, 2006; and 60/758,794, filed Jan. 13, 2006, the entire contents of which are hereby incorporated by reference.The present invention relates to rotary pumps and, more specifically, to centrifugal rotary ...

VERTICALLY MOUNTED AND MAGNETICALLY DRIVEN POWER GENERATION APPARATUS WITH WEIGHT-FREE AND ENERGY-SAVING EFFECT

A vertically mounted and magnetically driven power generation apparatus has multiple shelves vertically arranged and spaced apart. Each shelf has a through hole tapering downwards. A spindle is mounted through the multiple through holes. A motor driving the spindle and a primary power generator driven by the spindle and located below the motor are mounted around the spindle. Because of the weight of the primary power generator, adding additional weight is not need. A magnetic driven member is mounted around the spindle and located within a corresponding through hole. Multiple magnetic drive assemblies are mounted on inner walls of the multiple through holes. Each magnetic driven member is subject to forces of magnetic repulsion caused by first and second magnetic drive members of a corresponding magnetic drive assembly for the spindle to be rotated under a friction-free condition to enhance torque and rotation speed of the spindle. 1. A vertically mounted and magnetically driven power generation apparatus with weight-free and energy-saving effect , comprising: [ multiple shelves vertically arranged and vertically spaced apart from each other, each shelf having a through hole formed through the shelf and tapering downwards;', 'multiple struts securely connected with the multiple shelves; and', 'a center axis vertically and centrally passing through the support frame and the through holes of the multiple shelves;, 'a support frame having, a spindle vertically mounted through the support frame along the center axis; and', an upper driven portion being a truncated cone tapering upwards, wherein a top of the upper driven portion extends beyond a top surface of a corresponding shelf through a top opening of the through hole of the corresponding shelf;', 'a lower driven portion with a top connected with a bottom of the upper driven portion, being a truncated cone tapering downwards, having a shape symmetrical to that of the upper driven portion, having a magnetic pole ...

HYBRID MAGNETIC SUSPENSION OF A ROTOR

A hybrid magnetic suspension of a rotor () having compressor wheels () having permanent magnets () integral to shrunk fit rings () arranged on the rotor () in the vicinity of the compressor wheels (), permanent magnets () integral to stationary rings () coaxially arranged with the rotor () and associated with a resilient material () to define a passive radial magnetic bearing, coils () associated with magnetic armatures () and facing rotor parts () being located perpendicularly to the rotor (), and axial sensors () configured for sensing the axial position of the rotor () and control means () configured for feeding the coils () as a function of the outputs of the axial sensors () for generating both axial bearing forces and a motor torque and thereby being adapted for defining an axial bearingless motor. 1123. A hybrid magnetic suspension of a rotor () having a first compressor wheel () at a first end thereof and a second compressor wheel () at a second end thereof , comprising:{'b': 4', '14', '104', '114', '8', '18', '1', '2', '3', '4', '14', '104', '114', '9', '19', '1, 'at least first and second sets of permanent magnets (, ; , ) integral to first and second rings (, ) shrunk fit onto the rotor () in the vicinity of the first and second compressor wheels (, ), the first and second sets of permanent magnets (, ; , ) being retained by an outer non-magnetic ring (, ) coaxial with the rotor (),'}{'b': 24', '34', '124', '134', '23', '33', '1', '5', '15', '2', '3', '24', '34', '124', '134', '4', '14', '104', '114, 'at least third and fourth sets of permanent magnets (, ; , ) integral to first and second stationary rings (, ) coaxially arranged with the rotor () and associated with a resilient material (, ) in the vicinity of the first and second compressor wheels (, ), the third and fourth sets of permanent magnets (, ; , ) facing the first and second sets of permanent magnets (, ; , ) respectively while providing a gap there-between to define a passive radial magnetic ...

FLYWHEEL SYSTEMS AND FLYWHEEL BEARING MODULES

A flywheel system includes a rotor configured to rotate about a rotation axis. The flywheel system further includes a fixture and an active magnetic bearing module for actively stabilizing the rotor relative to the fixture. The active magnetic bearing module includes a plurality of first magnetizable elements mechanically coupled to or integrated in the rotor, and a plurality of electromagnets mechanically coupled to the fixture and configured to magnetically couple with the plurality of first magnetizable elements to actively stabilize the rotor relative to the fixture. Each of the first magnetizable elements is farther than each of the electromagnets from the rotation axis. 1. A flywheel system comprising:a fixture providing a base and a stator;a rotor having a cavity for receiving the stator;a generator/motor module configured to convert between rotational energy of rotor and electrical the generator/motor module further comprising a plurality of permanent magnets mechanically coupled to the rotor and magnetically', 'coupled to the windings of the stator;, 'energy in windings of the stator;'} a plurality of magnetizable elements mechanically coupled with the rotor, and', 'a plurality of electromagnets mechanically coupled to a shaft and configured to magnetically couple with the plurality of magnetizable elements to actively stabilize the', 'rotor relative to the shaft;, 'an active magnetic bearing module for actively stabilizing the rotor relative to the fixture, the active magnetic bearing module comprising'}wherein the generator/motor module and the active magnetic bearing module are arranged around the shaft at different distances to the base.2. The flywheel system according to claim 1 , further comprising a levitation module configured to magnetically levitate the rotor above the base.3. The flywheel system according to claim 2 , a first set of permanent magnets mechanically coupled to the stator, and', 'a second set of permanent magnets mechanically coupled ...

SYSTEM AND METHODOLOGY FOR A WIND TURBINE

A wind turbine having discrete sets of magnets on the turbine support and the turbine rotor, creating repelling forces and spaces therebetween. The reduction of friction between the turbine rotor and the turbine support allows for an increase in energy production and scale of the wind turbines. 1. A wind turbine , comprising:a turbine support having a lower portion and a vertical portion;said lower portion of said turbine support aligned along and extending horizontally outward from a core axis, an upper surface of said lower portion having first magnet means positioned thereon aligned along said core axis;said vertical portion of said turbine support being cylindrically shaped and having second magnet means positioned thereon aligned along said core axis;a turbine rotor having a central portion and a lower portion;said central portion of said turbine rotor configured to concentrically receive said vertical portion of said turbine support therein, said vertical portion being radially inside said central portion, said turbine rotor aligned about said core axis and rotatable thereabout, and having third magnet means positioned on said central portion along said core axis, said third magnet means aligned opposing said second magnet means, the opposition creating and maintaining a first space therebetween;said lower portion of said turbine rotor aligned along and extending outward from said core axis, a lower surface of said lower portion having fourth magnet means positioned thereon aligned along said core axis, said fourth magnet means aligned opposing said first magnet means, the opposition creating and maintaining a second space therebetween;a plurality of blades coupled to said turbine rotor; andat least one generator configured to generate electric power from the movement of said turbine rotor.2. The wind turbine according to claim 1 , wherein said turbine rotor covers said vertical portion of said turbine support.3. The wind turbine according to claim 1 , wherein ...

PUMP

A pump includes: a rotor; a magnetic bearing supporting the rotor by a magnetic force; a drive mechanism rotationally driving the rotor; a pump mechanism including an impeller attached to the rotor; and a control unit controlling the magnetic bearing which includes: a bearing rotor member in the rotor formed from a magnetic material; and a bearing stator member facing the bearing rotor member, the bearing stator member has: a core formed from a magnetic material; and a coil wound around the core, the drive mechanism includes: a driven member adjacent in a radial direction to the bearing rotor member; and a drive portion facing the driven member in the radial direction, and magnetically coupled to the driven member to drive the rotor, and the control unit corrects rotational position of the rotor based on a detection signal from a first sensor portion capable of detecting displacement of the rotor. 110.-. (canceled)11. A pump comprising:a rotor;a magnetic bearing that supports the rotor by a magnetic force;a drive mechanism that rotationally drives the rotor;a pump mechanism including an impeller which is attached to the rotor; anda control unit that controls the magnetic bearing,the magnetic bearing comprising:a bearing rotor member formed from a magnetic material and provided in the rotor; anda bearing stator member disposed so as to face the bearing rotor member,the bearing stator member having:a core formed from a magnetic material; anda coil wound around the core,the drive mechanism comprising:a driven member provided adjacently in a radial direction to the bearing rotor member in the rotor; anda drive portion that is disposed facing the driven member in the radial direction, and is magnetically coupled to the driven member to drive the rotor, andthe control unit correcting rotational position of the rotor based on a detection signal from a first sensor portion provided so as to be capable of detecting displacement of the rotor.12. The pump according to claim 11 ...

Vacuum pump, rotor, and washer

A vacuum pump and a washer which can reduce vibration of a rotor and the rotor which can reduce the vibration are provided. When an inertia moment ratio which is a ratio between the inertia moment around a z-axis and the inertia moment around an x-axis or a y-axis is larger than 1, a natural frequency ω 2 does not match a rotational frequency Ω z but goes away from that. When the natural frequency ω 2 matches the rotational frequency Ω z , the rotor vibrates and thus, a fatigue failure occurs in a rotor blade. When the rotor is to be made larger in a radial direction of a rotating shaft, a value of the inertia moment ratio is set to a value larger than 1.

MAGNETIC BEARING CONTROL APPARATUS, CONTROL METHOD AND HIGH SPEED ROTATING MOTOR USING THE SAME

A magnetic bearing control apparatus includes a plurality of output elements configured to generate electromagnetic force, a magnetic bearing configured to float a rotation shaft from a surface of the magnetic bearing based on the electromagnetic force generated by the plurality of output elements, at least one displacement sensor configured to sense a displacement of the rotation shaft, and a controller. The controller is configured to control a current supplied to the plurality of output elements, to control a position of the rotation shaft based on the current supplied to the plurality of output elements according to the displacement of the rotation shaft, and to determine a failure of the displacement sensor. 1. A magnetic bearing control apparatus , comprising:a plurality of output elements configured to generate electromagnetic force;a magnetic bearing configured to float a rotation shaft from a surface of the magnetic bearing based on the electromagnetic force generated by the plurality of output elements;at least one displacement sensor configured to sense a displacement of the rotation shaft; and control a current supplied to the plurality of output elements,', 'control a position of the rotation shaft based on the current supplied to the plurality of output elements according to the displacement of the rotation shaft, and', 'determine a failure of the displacement sensor., 'a controller configured to2. The magnetic bearing control apparatus of claim 1 , wherein the displacement sensor comprises:a photo coupler arranged adjacent to the rotation shaft and configured to output a waveform having a frequency according to the displacement of the rotation shaft;a mixing portion configured to, based on a difference between a reference frequency and the frequency of the waveform, convert the waveform into a first signal having a conversion frequency;a differential amplifier configured to amplify a magnitude of the first signal;a noise filter configured to reduce a ...

Wiring Structure of Magnetic Suspension Bearing, Compressor and Air Conditioner

The present disclosure provides a wiring structure of a magnetic suspension bearing, a compressor and an air conditioner. The wiring structure of a magnetic suspension bearing, for electrically connect a control coil of the magnetic suspension bearing with an external power source, includes a circuit board; wherein the number of the magnetic suspension bearing is two or more, and the control coils of the two or more magnetic suspension bearings are all configured to electrically connect to the circuit board, and the circuit board is configured to connect to the external power source. The present disclosure has the advantages of reasonable design, simple structure, implementation of integrating wiring of multiple magnetic suspension bearings, simplification of wiring work, improvement of production efficiency, and improvement of wiring reliability. 1. A magnetic suspension bearing assembly , comprising:at least one magnetic suspension bearing; andat least one wiring structure for electrically connecting a control coil of the at least one magnetic suspension bearing with an external power source, andat least one circuit board;wherein a number of magnetic suspension bearings of the magnetic suspension bearing assembly is two or more,wherein the control coil of the at least one magnetic suspension bearing is configured to electrically connect to the at least one circuit board, andwherein the at least one circuit board is configured to connect to the external power source.2. The magnetic suspension bearing assembly according to claim 1 , wherein the at least one circuit board is provided with a wiring socket; andwherein the at least one circuit board is connected to the external power source through the wiring socket.3. The magnetic suspension bearing assembly according to claim 1 , wherein the at least one wiring structure further comprises at least one adapter member;wherein the control coil of the at least one magnetic suspension bearing is electrically connected to ...

ROTARY PUMP WITH THRUST BEARINGS

A rotary blood pump includes a casing defining a pumping chamber. The pumping chamber has a blood inlet and a tangential blood outlet. One or more motor stators are provided outside of the pumping chamber. A rotatable impeller is within the pumping chamber and is adapted to cause blood entering the pumping chamber to move to the blood outlet. The impeller has one or more magnetic regions. The impeller is radially constrained in rotation by magnetic coupling to one or more motor stators and is axially constrained in rotation by one or more hydrodynamic thrust bearing surfaces on the impeller. 1. A rotor for use in a rotary pump comprising:a plurality of axially raised bodies spaced apart to define fluid flow paths therebetween, and an upwardly facing common surface extending radially inwardly from each of the raised bodies, wherein the raised bodies and the fluid flow paths define a substantially circular periphery, each fluid flow path having a downwardly sloping bottom surface extending from the common surface to a respective fluid exit at the periphery, wherein the downwardly sloping bottom surfaces of the fluid flow paths are separated from one another by a portion of the common surface.2. The rotor as claimed in claim 1 , wherein the common surface is recessed axially relative to each of the raised bodies.3. The rotor as claimed in claim 1 , wherein the common surface is a planar surface.4. The rotor as claimed in claim 2 , wherein the axially recessed common surface is bounded by substantially planar axially extending surfaces of the raised bodies.5. The rotor as claimed in claim 4 , wherein the axially extending surfaces of the raised bodies define a polygon section of the rotor.6. The rotor as claimed in claim 3 , wherein each of the fluid flow paths has parallel sidewalls perpendicular to the sidewalls of the flow path which is adjacent to such flow path claim 3 , wherein the surface area of a leading sidewall of each flow path is less than the surface area ...

MAGNETIC BEARING DEVICE AND VACUUM PUMP

A predetermined timing is a timing at which the sampling timing is in a vicinity of a maximum peak position of the carrier wave signal and a timing at which the sampling timing is in a vicinity of a minimum peak position. The demodulation arithmetic section outputs, as the demodulation calculated result, a value d3 calculated with d3=(d1−d2)/2 when a data value of the digital signal sampled in the vicinity of the maximum peak position is denoted by d1 and a data value of the digital signal sampled in the vicinity of the minimum peak position is denoted by d2. 1. A magnetic bearing device for supporting a body to be supported using an electromagnet in a non-contact manner , comprising:a sine wave discrete value generating section for generating a sine wave discrete value by a digital arithmetic process;a carrier wave generating section for generating a carrier wave signal based on the sine wave discrete value;a displacement detecting section for modulating the carrier wave signal depending on a supporting position of the body to be supported so as to output a modulation wave signal;an AD converting section for AD-converting the modulation wave signal into a digital signal at a sampling frequency fs that satisfies fc=(n+½)·fs (n is an integer of not less than 0) and at a predetermined timing that synchronizes with the sine wave discrete value when a frequency of the carrier wave signal is denoted by fc;a demodulation arithmetic section for performing demodulation arithmetic based on the AD-converted digital signal; anda controller for controlling a current of the electromagnet based on a demodulation calculated result of the demodulation arithmetic section so as to control the supporting position of the body to be supported, whereinthe predetermined timing is a timing at which the sampling timing is in a vicinity of a maximum peak position of the carrier wave signal and a timing at which the sampling timing is in a vicinity of a minimum peak position, andthe ...

END PLATE FOR AN ELECTRIC MACHINE, ELECTRIC MACHINE AND METHOD FOR ASSEMBLING AN ELECTRIC MACHINE

An end plate for an electric machine includes: a bearing receptacle in which a magnetic bearing which is configured for rotatably mounting a rotor of the electric machine can be accommodated; and a radially outwardly pointing circumferential contour on which a number of at least three supporting elements are provided, which supporting elements each protrude radially beyond the circumferential contour by a determined protruding amount, with the result that the supporting elements define a discontinuous external circumferential contour of the end plate. The respective protruding amounts of the support elements are dimensioned such that the end plate can be fitted in by making a center of the magnetic bearing correspond to at least one of a geometric longitudinal axis of the electric machine and a magnetic longitudinal axis of the electric machine. 116-. (canceled)17301. An end plate () for an electric machine () , the end plate comprising:{'b': 80', '20', '1, 'a magnetic bearing () configured to rotatably mount a rotor () of the electric machine ();'}{'b': 40', '80, 'a bearing receptacle (), configured to accommodate the magnetic bearing () therewithin; and'}{'b': 50', '60', '70', '50', '30, 'a radially outer circumferential contour (), on which at least three support elements (, ) are provided, each of which protrudes radially to the outside, with respect to the circumferential contour (), by a protruding amount (M) so as to define a discontinuous outer circumferential contour of the end plate (),'}{'b': 60', '70', '30', '80', '1', '1, 'wherein the respective protruding amounts (M) of the at least three support elements (, ) are dimensioned so that the end plate () is fitted in by making a center of the magnetic bearing () coincide with at least one of a geometrical longitudinal axis (A2) of the electric machine () and a magnetic longitudinal axis (A4) of the electric machine ().'}18306070506070. The end plate () according to claim 17 , wherein the support elements ( ...

BEARINGLESS HUB ASSEMBLY WITH ELECTROMAGNETIC DRIVE SYSTEM AND ASSOCIATED METHODS

A bearingless hub assembly comprising a rim hollowed to receive a tube magnet, and magnets embedded around the circumference of the rim on both ends. The rim is capped by front and rear rim plates configured to hold the embedded magnets in place and fitted to receive respective circular magnets. Similar magnets in corresponding front or rear drive plate maintain space (i.e., levitation) vis-à-vis the front and rear rim caps by repelling each other, thus allowing the rim (and, as applied, a mechanically-attached tire assembly) to move freely with no friction. The front and rear drive plate carry forward and reverse electromagnetic actuators as well as forward and reverse levitation control units, power generators and speed sensors. These components mount 360 degrees around the circumference of the drive plates while the embedded magnets of the rim spin through when in motion. 1. A magnetic bearing apparatus comprising:a rear drive plate mechanically mounted to a spindle assembly;a front rim cap and a rear rim cap mechanically mounted to respective ends of a rim, to define a rim assembly; anda front drive plate;wherein the spindle assembly, the rear drive plate, the rim assembly, and the front drive plate are characterized by a common axis;wherein a first repel force operates to magnetically mount the rim proximate to the spindle assembly at a first levitation spacing of the first repel force;wherein a second repel force operates to magnetically mount the front rim cap proximate to the front drive plate at a second levitation spacing of the second repel force; andwherein a third repel force operates to magnetically mount the rear rim cap proximate to the rear drive plate at a third levitation spacing of the third repel force.2. The magnetic bearing apparatus according to claim 1 , wherein [ a tube magnet,', 'a cylindrical body characterized by an outer end and an inner end,', 'a rim center hole axially centered through the cylindrical body and configured to fittedly ...

COMPACT CENTRIFUGAL PUMP WITH MAGNETICALLY SUSPENDED IMPELLER

A centrifugal fluid pump with a fully magnetically suspended rotor to improve blood compatibility when pumping blood is disclosed. The pump stabilizes radial displacements of a disc-like rotor with active control through separate electric motor and magnetic bearings to improve the pump's critical performances including device packaging size, system simplicity and reliability, stiffness and other dynamic performances of suspension, power efficiency, and others. 1. A pump apparatus , comprising:a housing having a central axis and an inlet and an outlet adapted to respectively receive and discharge fluid;a rotor magnetically suspended in the housing and rotatable about the central axis, the rotor having an impeller adapted to pump fluid;a motor adapted to drive the rotor about a rotational axis substantially coincident with the central axis; an annular rotor primary pole piece disposed in the rotor coaxially with the rotational axis, the annular rotor primary pole piece including a ferromagnetic material adapted to channel magnetic flux and having first and second end surfaces and a cylindrical side surface adapted to serve as a rotor pole face;', 'electromagnet units disposed in the housing and circumferentially distributed about the central axis, each electromagnet unit including:', a core extending from the pole shoe;', 'a back yoke connecting two the cores of different electromagnet units together; and', 'a coil wound around the core and adapted to conduct electric current;, 'a pole shoe having first and second pole shoe end surfaces and a side pole shoe cylindrical surface adapted to serve as a casing pole face;'}, 'wherein the pole shoe, the core, and the back yoke each includes ferromagnetic material adapted to channel magnetic flux;', 'wherein the first end surface of the rotor primary pole piece and the first end pole shoe surfaces of the pole shoes are on a first side along an axial direction;', 'wherein the rotor pole face and each of the casing pole faces ...

MAGNETIC LEVITATION AUDIO DEVICE

A magnetic levitation audio device is disclosed. The magnetic levitation audio device comprises a magnetic levitation base capable of generating a magnetic field and a sound box levitated above the magnetic levitation base through a magnetic force. The magnetic levitation base comprises a base enclosure, an electromagnetic induction module disposed in the base enclosure, a PCB board and position indicator lamps, with the electromagnetic induction module and the position indicator lamps being electrically connected with the PCB board respectively; and the sound box comprises an enclosure, a magnet assembly disposed in the enclosure, a power supply module, an audio module, and a switch unit capable of sensing an instantaneous air flow. The present disclosure can control the sound box to switch on without the need of manual operations, and this helps to improve the practicability of the magnetic levitation audio device. 1. A magnetic levitation audio device , comprising a magnetic levitation base capable of generating a magnetic field and a sound box levitated above the magnetic levitation base through a magnetic force , wherein the magnetic levitation base comprises a base enclosure , an electromagnetic induction module disposed in the base enclosure , a printed circuit board (PCB) board and position indicator lamps , with the electromagnetic induction module and the position indicator lamps being electrically connected with the PCB board respectively; and the sound box comprises an enclosure , a magnet assembly disposed in the enclosure , a power supply module , an audio module , and a switch unit capable of sensing an instantaneous air flow , the switch unit has a terminal electrically connected with the power supply module and the other terminal electrically connected with the audio module , and the switch unit is adapted to control the power supply module to output/disconnect the power to the audio module when an instantaneous air flow is sensed.2. The magnetic ...

HIGH CONICAL ANGLE TOUCH DOWN BEARING

A machine comprises a rotor (), a stator (), main bearings (), and safety bearings () for supporting the rotor in a situation where the main bearings are non-operating. When the rotor is supported by the main bearings, there are radial and axial clearances between the rotor and the safety bearings. A contact surface () of the rotor contacting the safety bearing in response to closure of the axial clearance is oblique with respect to a spatial plane perpendicular to a rotational axis of the rotor so that an angle (α) between the rotational axis and a normal of the contact surface at a point of contact between the rotor and the safety bearing is greater than zero and at most 10 degrees. The obliqueness of the contact surface eliminates at least partly an excitation for whirling motion when the rotor is supported by the safety bearings. 2107. The machine according to claim 1 , wherein the contact surface () of the rotor is oblique with respect to the spatial plane so that the point of contact moves claim 1 , in an axial direction claim 1 , towards the safety bearing when the point of contact moves claim 1 , in a radial direction claim 1 , towards the rotational axis of the rotor.3. The machine according to claim 1 , wherein the angle (α) is greater than C1 and at most C2 claim 1 , where C1 is one of the following 0 claim 1 , 1 claim 1 , 2 claim 1 , 3 claim 1 , or 4 degrees and C2 is one of the following so that C2>C1: 1 claim 1 , 2 claim 1 , 3 claim 1 , 4 claim 1 , or 5 degrees.4107. The machine according to claim 1 , wherein the contact surface () of the rotor is conical so that the angle is substantially constant when the point of contact is moved towards or away from the rotational axis of the rotor.5307. The machine according to claim 1 , wherein a profile of the contact surface () of the rotor is concave so that the angle increases when the point of contact is moved towards the rotational axis of the rotor.6307. The machine according to claim 5 , wherein the ...

MAGNETIC BEARING AND COMPRESSOR USING THE SAME

A stator is provided which exerts a combined electromagnetic force of a plurality of electromagnets on a drive shaft having a fluctuating load. A controller is provided which controls a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through a coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform a position control on the drive shaft. The controller adjusts the second coil current to reduce an average value of the second coil current. 112-. (canceled)13. A magnetic bearing comprising:a stator including a plurality of electromagnets and configured to exert a combined electromagnetic force of the plurality of electromagnets on a drive shaft having a fluctuating load; anda controller configured to control a current difference between a first coil current passed through a coil of the electromagnet generating an electromagnetic force in a direction opposite to that of the load and a second coil current passed through a coil of the electromagnet generating an electromagnetic force in the same direction as that of the load to perform a position control on the drive shaft, and adjust the second coil current to reduce an average value of the second coil current.14. The magnetic bearing of claim 13 , whereinthe controller increases a change range of the current difference when the first coil current decreases depending on the load, and decreases the change range of the current difference when the first coil current increases depending on the load.15. The magnetic bearing of claim 13 , wherein a controller configured to control a control current causing each electromagnet to generate an electromagnetic force, and a bias current added to the control current to linearize a relationship between a value of the control current and the combined electromagnetic force, ...

Actuator Compromising Two Magnetic Bearing Motors

The invention relates to an actuator comprising two magnetic bearing motors. The actuator is characterized in that it comprises two magnetic bearing motors (I, Ibis), one extending from the other, said two bearing motors (I, Ibis) being offset angularly in relation to one another. The actuator is also characterized in that an active or passive stop () is disposed between the two bearing motors (I, Ibis), said stop () acting on the rotor (bis) and stator (bis) parts of each bearing motor (I, Ibis), a housing () being provided in the actuator between the first and second bearing motors (I, Ibis) for receiving the stop (). The invention is suitable for use in the field of electric machines. 1334433441111131113334411101113. An actuator with at least one magnetic bearing motor , said at least one motor comprising a rotor ( , bis) and a stator ( , bis) , the rotor ( , bis) being magnetically suspended relative to the stator ( , bis) , characterized in that it comprises two magnetic bearing motors ( , bis) positioned in the extension of one another , the two bearing motors ( , bis) being angularly offset relative to one another , and in that an active or passive stop () is inserted between the two bearing motors ( , bis) , said stop () acting on the rotor ( , bis) and stator ( , bis) parts of each bearing motor ( , bis) , a housing () being provided on the actuator between the first and second bearing motors ( , bis) to receive the stop ().211. The actuator according to claim 1 , characterized in that the two bearing motors ( claim 1 , bis) are offset by a mechanical angle of 22.5°.33311334411. The actuator according to any one of the preceding claims claim 1 , characterized in that the rotor part ( claim 1 , bis) of each bearing motor ( claim 1 , bis) is formed by magnets ( claim 1 , bis) symmetrically distributed around the stator part ( claim 1 , bis) of said bearing motor ( claim 1 , bis).433. The actuator according to the preceding claim claim 1 , characterized in ...

PERSONAL CARE DEVICE ACTUATOR WITH RATTLE MITIGATION

An actuator () for a personal care appliance () having an eccentric core () to preload the actuator () to prevent rattling caused by detrimental reactionary forces. The eccentric core () includes a pole assembly () radially extending from a spindle having at least a first set (-) and a second set (-) of pole members. The first set (-) has a greater length as measured from the center of the spindle than the second set (-), reducing the magnet gap on one side of the spindle () to create an eccentric core and preload the actuator (). Alternatively, the preload can be mechanically created by a set of bearings () disposed within housing () of the actuator , where the bearings () have a centerline (A) offset from the principal axis (A) of the housing (). 1. An actuator for a personal care appliance , comprising:a housing having an inner surface and a principal axis extending longitudinally through the center of the housing, and having sequence of more than one magnet, disposed along the inner surface of the housing;a set of bearings disposed within said housing, wherein the bearings have a centerline offset from the principal axis; anda spindle having a pole assembly arranged in a radial configuration about the spindle, wherein the spindle is disposed within the bearings along a secondary axis offset from the principal axis.2. The actuator of claim 1 , wherein the centerline is the same as the secondary axis.3. The actuator of claim 1 , wherein the centerline is different from the secondary axis.4. The actuator of claim 1 , wherein the pole assembly further comprises a plurality of pole members of substantially the same length.5. The actuator of claim 1 , wherein the bearings are common bearings.6. The actuator of claim 5 , wherein said common bearings are bushing bearings.7. The actuator of claim 1 , wherein the personal care device is an electric toothbrush.8. A personal care device having an actuator according to .9. An actuator for a personal care appliance claim 1 , ...

EXPOSURE APPARATUS, MOVABLE BODY APPARATUS, FLAT-PANEL DISPLAY MANUFACTURING METHOD, AND DEVICE MANUFACTURING METHOD

In a substrate stage, when a Y coarse movement stage moves in the Y-axis direction, an X coarse movement stage, a weight cancellation device, and an X guide move integrally in the Y-axis direction with the Y coarse movement stage, and when the X coarse movement stage moves in the X-axis direction on the Y coarse movement stage, the weight cancellation device move on the X guide in the X-axis direction integrally with the X coarse movement stage. Because the X guide is provided extending in the X-axis direction while covering the movement range of the weight cancellation device in the X-axis direction, the weight cancellation device is constantly supported by the X guide, regardless of its position. Accordingly, a substrate can be guided along the XY plane with good accuracy. 1. An exposure apparatus of a scanning type which moves an object subject to exposure in a first direction parallel to a horizontal plane with a predetermined first stroke with respect to an energy beam for exposure at the time of exposure processing , the apparatus comprising:a first movable body which is movable by the predetermined first stroke at least in the first direction;a second movable body which guides movement of the first movable body in the first direction and is movable by a second stroke along with the first movable body in a second direction orthogonal to the first direction within the horizontal plane;an object holding member which holds the object and is movable in a direction at least parallel to the horizontal plane with the first movable body;a weight cancellation device which supports the object holding member from below and cancels weight of the object holding member; anda support member which extends in the first direction, and supports the weight cancellation device from below, and also is movable in the second direction by the second stroke in a state supporting the weight cancellation device from below.2. The exposure apparatus according to claim 1 , whereinthe second ...

BEARINGLESS HUB ASSEMBLY WITH ELECTROMAGNETIC DRIVE SYSTEM AND ASSOCIATED METHODS

A bearingless hub assembly comprising a rim hollowed to receive a tube magnet, and magnets embedded around the circumference of the rim on both ends. The rim is capped by front and rear rim plates configured to hold the embedded magnets in place and fitted to receive respective circular magnets. Similar magnets in corresponding front or rear drive plate maintain space (i.e., levitation) vis-à-vis the front and rear rim caps by repelling each other, thus allowing the rim (and, as applied, a mechanically-attached tire assembly) to move freely with no friction. The front and rear drive plate carry forward and reverse electromagnetic actuators as well as forward and reverse levitation control units, power generators and speed sensors. These components mount 360 degrees around the circumference of the drive plates while the embedded magnets of the rim spin through when in motion. 1. A magnetic bearing apparatus comprising: a tube magnet,', 'a cylindrical body characterized by an outer end and an inner end,', 'a rim center hole axially centered through the cylindrical body and configured to fittedly receive the tube magnet,', 'a plurality of embedded magnets,', 'a plurality of magnet slots disposed about the outer end and the inner end of the cylindrical body at a magnet slot depth and configured to fittedly receive a respective one of the plurality of embedded magnets,, 'a rim comprising a front rim cap center hole axially centered through the front rim cap,', 'a front rim cap ring magnet, and', 'a front rim cap annular groove axially centered about the front rim cap center hole and configured to fittedly receive the front rim cap ring magnet;, 'a front rim cap comprising a rear rim cap center hole axially centered through the rear rim cap,', 'at least one rear rim cap loop magnet, and', 'at least one rear rim cap annular groove axially centered about the rear rim cap center hole configured to fittedly receive a respective one of the at least one rear rim cap loop magnet ...

SELF-SENSING ACTIVE MAGNETIC BEARING SYSTEMS AND METHODS

One embodiment describes a rotary machine system, which includes a stator with a first tooth, a second tooth, a third tooth, and a fourth tooth; a first electromagnet that includes a first electromagnet wire wrapped around the second tooth and the third tooth and that generates a first magnetic field to attract a drive shaft; a first integrated position sensor, which includes a first sensor wire that carries a first current wrapped around the first tooth and the second tooth; a second integrated sensor, which includes a second sensor wire that carries a second current wrapped around the third tooth and the fourth tooth; and a controller that determines current position of the drive shaft based at least on change of inductance of the first sensor wire and the second sensor wire, and that instructs the first electromagnet to adjust magnitude of the first magnetic field based at least in part on the current position. 1. A rotary machine system , comprising: a stator comprising a first tooth, a second tooth, a third tooth, and a fourth tooth configured to be radially spaced from the drive shaft;', 'a first electromagnet comprising a first electromagnet wire wrapped around the second tooth and the third tooth, wherein the first electromagnet is configured to generate a first magnetic field that exerts an attractive force on the drive shaft toward the first electromagnet;', 'a first integrated position sensor comprising a first sensor wire wrapped around the first tooth and the second tooth, wherein the first sensor wire is configured to carry a first current; and', 'a second integrated sensor comprising a second sensor wire wrapped around the third tooth and the fourth tooth, wherein the second sensor wire is configured to carry a second current; and, 'an active magnetic bearing assembly configured to facilitate rotation of a drive shaft, wherein the active magnetic bearing assembly comprisesa controller configured to determine current position of the drive shaft based ...

CENTRIFUGAL BLOOD PUMP DEVICE

A pump device () includes a housing () including a blood inflow port () through which blood flows in, and having a fixed-side repulsive magnet () disposed in an annular manner; and an impeller () that is rotatably housed inside the housing (), and having a movable-side repulsive magnet () disposed in an annular manner. The fixed-side repulsive magnet () is disposed in a position offset toward the blood inflow port () side relative to the movable-side repulsive magnet (). In the fixed-side repulsive magnet () and the movable-side repulsive magnet (), a fixed-side repulsive surface () and a movable-side repulsive surface () adjacent to each other have the same polarity. 1. A pump device comprising:an impeller in which a first repulsive magnet is disposed in an annular manner; anda housing that rotatably houses therein the impeller, and includes an inner space into which a fluid flows via an inlet port facing a rotation axis of the impeller, and in which a second repulsive magnet is disposed in an annular manner;wherein the second repulsive magnet is disposed in a position offset in the direction of the rotation axis toward the inlet port relative to the first repulsive magnet; andwherein the first repulsive magnet and the second repulsive magnet respectively have magnetic pole surfaces adjacent to each other with the same polarity.2. The pump device according to claim 1 , wherein:the second repulsive magnet is disposed in a position offset in a radial direction orthogonal to the rotation axis at a larger radius relative to the first repulsive magnet.3. The pump device according to claim 2 , wherein:at least one of the first repulsive magnet and the second repulsive magnet is a ring body in which a first polarity is magnetized over an entire circumference of an outer circumferential portion, and a second polarity that is an opposite polarity of the first polarity is magnetized over an entire circumference of an inner circumferential portion.4. The pump device according ...

ROTATING ELECTRICAL MACHINE AND METHOD FOR MEASURING A DISPLACEMENT OF A ROTOR OF A ROTATING ELECTRICAL MACHINE

A rotating electrical machine includes a stator, a rotor and at least one active magnetic bearing including a bearing winding, which is an air-gap winding, and includes at least a first phase winding and a second phase winding. A measurement arrangement measures the radial displacement of the rotor by injecting a displacement measurement injected signal into at least one section of at least one of the bearing windings of one of the magnetic bearings, and capturing at least one displacement measurement signal wherein this displacement measurement signal depends on the rotor displacement in a radial direction relative to the stator, this dependency being due to eddy currents in the rotor induced by the displacement measurement injected signal.

STRAY FLUX COMPENSATION IN A MAGNETIC BEARING DEVICE

A magnetic bearing device for magnetically suspending a rotor () for rotation about a rotation axis (A) comprises an amplifier device, a first main coil (p) and a second main coil (n). In order to compensate for a stray flux that is created when the main coils are supplied with currents from the amplifier device, a compensation coil (c) is connected between a common node of the main coils and the amplifier device with such polarity that a current flowing through the compensation coil will diminish the stray flux caused by the main coils (p, n). 1. A magnetic bearing device for magnetically suspending a rotor for rotation about a rotation axis , the magnetic bearing device comprising:an amplifier device comprising first, second, and third outputs;a first main coil extending around the rotation axis, the first main coil having first and second terminals;a second main coil extending around the rotation axis, the second main coil having first and second terminals; andat least one compensation coil extending around the rotation axis,the first terminal of the first main coil being connected to the first output of the amplifier device;the first terminal of the second main coil being connected to the second output of the amplifier device,the second terminal of the first main coil being connected to the second terminal of the second main coil at a common node,wherein the at least one compensation coil being connected between the third output of the amplifier device and the common node,wherein the first and second main coils causing a stray flux when being supplied with currents by the amplifier device, andwherein the first main coil, the second main coil and the at least one compensation coil being connected to the amplifier device with such polarities that any current that flows between the amplifier device and the common node through the at least one compensation coil causes a magnetic field that diminishes the stray flux caused by the main coils.2. The magnetic bearing ...

IMPELLER SUSPENSION MECHANISM FOR HEART PUMP

A centrifugal blood pump includes a housing that defines an inlet passage, a chamber, and an outlet passage. The pump includes an impeller rotatably positioned in the chamber to transfer blood from the inlet passage through the chamber and to the outlet passage and magnetic members embedded in the impeller such that the impeller and the magnetic members rotate together within the chamber. The pump includes a motor to control movement of the impeller in the chamber. The motor is adjacent the chamber and separated from the chamber by a partition member. The pump includes an inner annular magnetic member and an outer annular magnetic member embedded in a side of the housing opposite the partition member. A first net magnetic force between the inner annular magnetic member and the magnetic members exhibits greater attraction than a second net magnetic force between the outer annular member and the magnetic members. 1. A blood pump comprising:an impeller disposed within a housing, wherein the impeller comprises an inner magnet and an outer magnet relative to an axis of the impeller; and the inner annular magnetic member attracts the inner magnet;', 'the outer annular magnetic member repels the outer magnet; and', 'the outer annular magnetic member extends radially beyond the outer magnet., 'an inner annular magnetic member and an outer annular magnetic member disposed in a wall of the housing relative to the axis of the impeller, wherein2. The blood pump of claim 1 , wherein:a distance between the outer magnet and the outer annular magnetic member is greater than a distance between the inner magnet and the inner annular magnetic member.3. The blood pump of claim 1 , wherein:the inner annular magnetic member produces a greater magnetic force than the outer annular magnetic member.4. (canceled)5. The blood pump of claim 1 , wherein:at least a portion of the inner annular magnetic member extends radially inward of the inner magnet.6. The blood pump of claim 1 , further ...

Control Method and Control Device for Magnetic Bearing

A control method for a magnetic bearing comprises following steps: acquiring a suspension stopping instruction for the magnetic bearing, and respectively applying a control current to one or more control coils of the magnetic bearing to subject a rotor to a vertically or obliquely upwards electromagnetic force, a vertical component of the electromagnetic force is less than the gravity of the rotor. A control device for a magnetic bearing is also disclosed, comprising a suspension stopping instruction acquiring unit and a control current applying unit. The control method and control device for a magnetic bearing can control a falling velocity of the rotor to be lower than that of the rotor being subjected only to the gravity, and have higher control efficiency. 1. A control method for a magnetic bearing , comprising following steps:acquiring a suspension stopping instruction for the magnetic bearing,applying a control current to a control coil of the magnetic bearing to subject a rotor of the magnetic bearing to a vertically or obliquely upwards electromagnetic force, a vertical component of the electromagnetic force is less than the gravity of the rotor.2. The control method of claim 1 , wherein the control current is gradually decreased.3. The control method of claim 2 , wherein a value of each control current Iis calculated based on an equation I=P×S+iuntil the value of each control current Iis zero;{'sub': x', 'x', 'x', 'x', 'x', 'x', 'x', 'x, 'wherein Pis a slope coefficient of switching each control current I, P=(0−i)/A, iis an initial value of each control current I, A is a number of switching times of each control current I, S is a number of iterations and has an initial value of zero, each control current Iis switched for every period T, a value of a period timer is n with an initial value of zero, and n is continuously accumulated, when n Подробнее

MAGNETIC BEARING DEVICE AND FLUID MACHINE SYSTEM USING SAME

A magnetic bearing device includes a magnetic bearing including a plurality of electromagnets, a displacement sensor configured to output an output signal in accordance with a displacement of a shaft, and a controller configured to control the electromagnets. The controller compensates for a change in levels of the output signal, the change occurring in accordance with a change in ambient temperature around the displacement sensor, based on one or more reference values correlating with the change in levels of the output signal. The one or more reference values are detected for use in controlling the rotary electric machine, a fluid machine system including the rotary electric machine, or an apparatus including the fluid machine system. 1. A magnetic bearing device , comprising:a magnetic bearing including a plurality of electromagnets configured to apply electromagnetic force to a shaft connected to a rotary electric machine;a displacement sensor configured to output an output signal in accordance with a displacement of the shaft; anda controller configured to control the electromagnets, whereinthe controller compensates for a change in levels of the output signal, the change occurring in accordance with a change in ambient temperature around the displacement sensor, based on one or more reference values correlating with the change in levels of the output signal, the one or more reference values being detected for use in controlling the rotary electric machine, a fluid machine system including the rotary electric machine, or an apparatus including the fluid machine system, andthe controller controls the electromagnets based on the compensated output signal for the change in levels of the output signal.2. The magnetic bearing device of claim 1 , whereinthe controller compensates for the change in levels of the output signal by transforming the output signal using a transformation law including one or more parameters, and corrects the one or more parameters in ...

ELECTROSTATIC STABILIZER FOR A PASSIVE MAGNETIC BEARING SYSTEM

Electrostatic stabilizers are provided for passive bearing systems composed of annular magnets having a net positive stiffness against radial displacements and that have a negative stiffness for vertical displacements, resulting in a vertical instability. Further embodiments are shown of a radial electrostatic stabilizer geometry (using circuitry similar to that employed in the vertical stabilizer). This version is suitable for stabilizing radial (lateral) displacements of a rotor that is levitated by annular permanent magnets that are stable against vertical displacements but are unstable against radial displacements. 1. An apparatus , comprising:a right cylindrical rotor rotatable about a central longitudinal axis, wherein said rotor comprises a first rotor surface comprising metal and a second rotor surface comprising metal, wherein said first rotor surface and said second rotor surface are located at opposite ends of said rotor;a first pair of concentric electrodes, comprising a first electrode and a second electrode, wherein said first electrode and said second electrode are spaced from each other and are spaced by a first gap from said first rotor surface;a second pair of concentric electrodes, comprising a third electrode and a fourth electrode, wherein said third electrode and said fourth electrode are spaced from each other and are spaced by a second gap from said second rotor surface;at least one source of radio frequency (RF) voltage connected across said first electrode and said second electrode to form a first series circuit, wherein said at least one source of RF voltage is connected across said third electrode and said fourth electrode to form a second series circuit;at least one inductor in said first series circuit;at least one inductor in said second series circuit; anda passive magnetic bearing system configured to provide radial and tilt stabilization of said rotor with respect to said central longitudinal axis upon rotation of said rotor.2. The ...

GENERATING RADIAL ELECTROMAGNETIC FORCES

An electromagnetic actuator can exert a radial electromagnetic force on a body that is configured to rotate about a rotational axis. The actuator includes a radial control magnetic pole assembly that includes radial control poles adjacent to and spaced apart by air gaps from the body. The actuator includes a permanent magnet (PM) magnetized along the axis, having one pole in contact with an axial face of the assembly and located proximate to a lateral surface of the body. The PM is magnetically coupled to the body in a non-contact manner resulting in a bias magnetic flux in the air gaps. The actuator includes a control coil around the radial control poles located radially outwards from the PM. Electrical current in the coils generates control magnetic flux in air gaps. The non-uniform net magnetic flux distribution around the body results in a radial electromagnetic force exerted on the body. 1. An electromagnetic actuator comprising:a body having a rotational axis; anda radial control magnetic pole assembly concentric with the rotational axis, separated from the body by radial gaps and comprising at least three radial control poles adjacent to and spaced apart from a lateral surface of the body, the radial control poles configured to communicate magnetic flux with the lateral surface of the body, the body and the radial control pole magnetically coupled and defining at least a portion of a radial control magnetic circuit,a permanent magnet magnetized along the rotational axis, the permanent magnet having a first magnetic pole residing on an axially facing surface of the radial control magnetic pole assembly, located proximate of the lateral surface of the body and separated from the body by an air gap,a magnet pole piece in contact with a second magnetic pole of the permanent magnet and configured to communicate magnetic flux with the lateral surface of the body; the body, the radial control magnetic pole assembly, the permanent magnet and the pole piece defining a ...

MAGNETIC LEVITATION OF A STATIONARY OR MOVING OBJECT

A magnetic lifting device is described. The magnetic lifting device can be configured to generate magnetic lift using a moving magnetic field to generate an eddy current effect in conductive substrate beneath the device. In one embodiment, the moving magnetic field can be generated by a rotor with arrangement of permanent magnets which is driven by a motor. In operation, the rotor can be spun up from rest to above a threshold velocity, which causes the magnetic lifting device to rise up from the conductive substrate, hover in place in free flight and move from location to location. In free flight, the magnetic lifting device can be configured to carry a payload, such as a person. 1. A magnetic lifting device comprising:a rotor including an arrangement of permanent magnets wherein a rotation of the rotor causes a generation of magnetic lift when the magnetic lifting device is placed on a conductive substrate;a motor coupled to the rotor;a payload platform configured to receive a payload;a controller, coupled to the motor, configured to control the motor to rotate the rotor at a rotational velocity which causes the magnetic lifting device and the payload to hover in free flight at a height above the conductive substrate;wherein the rotor, the motor, the payload platform and the controller are structural linked to one another.2. The magnetic lifting device of wherein a weight of the payload is more than 200 pounds.3. The magnetic lifting device of wherein the payload platform is configured to receive a standing person.4. The magnetic lifting device of claim 1 , wherein the rotor is disk shaped.5. The magnetic lifting device of claim 1 , wherein the permanent magnets are arranged in one or more concentric rings.6. The magnetic lifting device of claim 1 , wherein the arrangement of permanent magnets is substantially planar.7. The magnetic lifting device of claim 1 , wherein the arrangement of permanent magnets is three dimensional.8. The magnetic lifting device of claim ...

VACUUM PUMP, AND MAGNETIC BEARING DEVICE AND ANNULAR ELECTROMAGNET USED IN VACUUM PUMP

Bobbins of an annular electromagnet each have a bobbin body that has a coil wire wound around an outer periphery thereof and is attached to a respective tooth of an annular stator core by having the corresponding tooth inserted therethrough. A first flange portion in a rectangular hallow shape is provided on an end surface of the bobbin body near the center of the annular stator core and a second flange portion in a rectangular hallow shape is provided on the other end surface of the bobbin body. A coil winding amount increasing means is formed at least on the first flange portion or the second flange portion and increases the amount of winding of the coil wire wound around the bobbin body. 1. A vacuum pump comprising:a magnetic bearing device that is disposed radially outside of a rotor shaft and rotatably holds the rotor shaft, whereinthe magnetic bearing device has an annular stator core having, on an inner peripheral wall thereof, a plurality of teeth provided at predetermined intervals in a circumferential direction of the rotor shaft, and an annular electromagnet having a plurality of bobbins attached to the teeth respectively, the plurality of bobbins having coil wires wound around outer peripheries thereof,the plurality of bobbins each having:a rectangular cylindrical bobbin body that has the coil wire wound around the outer periphery thereof and is attached to each of the teeth;a first flange portion provided on an end surface of the bobbin body so as to face the rotor shaft and formed into a rectangular hallow shape as viewed from the front;a second flange portion provided on an end surface of the bobbin body so as to be opposite to the first flange portion and formed into a rectangular hallow shape as viewed from the front; andcoil winding amount increasing means formed at least on the first flange portion or the second flange portion and increasing the amount of winding of the coil wire wound around the bobbin body.2. The vacuum pump according to claim 1 ...

APPARATUS FOR TRANSFERRING SUBSTRATE

Disclosed is an apparatus for transferring substrates capable of stably transferring substrates by using magnetic levitation. The apparatus includes a substrate stage including a substrate loading unit, a first guide block disposed at a first end of the substrate stage and including a first magnet generator, a second guide block disposed at a second end of the substrate stage and including a second magnet generator, a first guide rail accommodating the first magnet generator and including a third magnet generator, and a second guide rail accommodating the second magnet generator and including a fourth magnet generator. The first magnet generator and the third magnet generator exert repulsive force on each other, and the second magnet generator and the fourth magnet generator exert repulsive force on each other. 1. An apparatus for transferring substrates , comprising:a substrate stage including a substrate loading unit;a first guide block disposed at a first end of the substrate stage and including a first magnet generator;a second guide block disposed at a second end of the substrate stage and including a second magnet generator;a first guide rail accommodating the first magnet generator and including a third magnet generator; anda second guide rail accommodating the second magnet generator and including a fourth magnet generator,the first magnet generator and the third magnet generator exerting repulsive force on each other, andthe second magnet generator and the fourth magnet generator exerting repulsive force on each other.2. The apparatus for transferring substrates of claim 1 , wherein the first through the fourth magnet generators comprise at least one of a permanent magnet claim 1 , an electromagnet claim 1 , and a super conductor.3. The apparatus for transferring substrates of claim 1 ,wherein the first guide block comprises a first mover,wherein the first guide rail comprises a first stator disposed to face the first mover, andwherein the first mover and ...

Centrifugal pump

A centrifugal pump includes a rotating blade member including an impeller member and a rotor magnet, a main body casing accommodating the rotating blade member, a coil portion that rotates the rotating blade member is located on a periphery of the rotor magnet, and an axial member associated with the main body casing. The rotating blade member pivots around the axial member. The axial member includes an end portion at axial rotor magnet side, and is fixed at the end portion. The main body casing forms a fluid introducing passage, and is associated with a blade casing accommodating the rotating blade member. An end portion of a bearing portion at an axial fluid introducing passage side is protruded such that the end portion of the bearing portion is exposed from an inner periphery side opening portion of the blade casing to the fluid introducing passage side.

METHOD FOR DETERMINING OPERATIONAL PARAMETERS OF A BLOOD PUMP

Methods and apparatuses for determining operational parameters of a blood pump comprising a rotor which transports the blood are provided. The change in the behaviour of at least one first and one second operational parameter, independently from each other, of the pump, is determined. A determination of the flow through the pump and/or the difference in pressure across the pump and/or the viscosity of the blood takes into account the determined change in behaviour of the at least two operational parameters. A modelling for a dynamic model of the known quantities may be carried out and an estimation method using a Kalman filter may be used. 1. A method for determining , operational parameters of a blood pump comprising a rotor which transports blood , the method comprising:determining a change in behaviour of at least two operational parameters including a first operation parameter and a second operation parameter, independently from each other, of the blood pump; anddetermining a flow through the blood pump, a difference in pressure across the blood pump, and/or a viscosity of the blood based on the determined change in behaviour of the at least two operational parameters.2. The method of claim 1 , wherein at least a rotational speed of the blood pump is measured as the first operational parameter and a change in rate of the rotational speed over time is determined as the change in behaviour of the second operational parameter.3. The method of claim 1 , wherein in the blood pump with the rotor which transports the blood claim 1 , a quantity that represents a force acting on the rotor in an axial direction of the blood pump is measured as the second operational parameter claim 1 , and a change in behaviour of this quantity over time is determined.4. The method of claim 1 , wherein determining the change in behaviour of the second operational parameter comprises determining a first time derivative of the second operational parameter.5. The method of claim 1 , wherein ...

MAGNETIC BEARING DEVICE AND FLUID MECHANICAL SYSTEM

A controller performs, in a first mode, a first operation for controlling composite electromagnetic force of electromagnets such that a target member moves within a predetermined moving range, and a second operation for acquiring temperature drift correlation information indicative of a correlation between a reference value and an input-output characteristic of a position sensor, based on the reference value and the input-output characteristic of the position sensor in the first operation. The controller performs, in a second mode, a third operation for controlling the composite electromagnetic force of the electromagnets according to a signal level of a detection signal from the position sensor, and a fourth operation for compensating the input-output characteristic of the position sensor in the third operation, based on the temperature drift correlation information and the reference value in the third operation. 2. The magnetic bearing device according to claim 1 , further comprising:a touchdown bearing configured to come into contact with the target member moving toward the magnetic bearing in a space between the plurality of electromagnets, thereby avoiding contact between the target member and the magnetic bearing, whereinthe controller performs the movement control operation in the first mode such that the target member moves from one end to another end of a movable range in the position detection direction restricted by the touchdown bearing.3. The magnetic bearing device according to claim 2 , whereinthe target member has an axial form,the plurality of electromagnets include first and second electromagnets facing each other in a radial direction of the target member with the target member interposed therebetween, and third and fourth electromagnets facing each other in the radial direction of the target member with the target member interposed therebetween, the direction in which the third and fourth electromagnets face each other intersecting with the ...

Rotary Blood Pump

The present invention provides a rotary blood pump with both an attractive magnetic axial bearing and a hydrodynamic bearing. In one embodiment according to the present invention, a rotary pump includes an impeller assembly supported within a pump housing assembly by a magnetic axial bearing and a hydrodynamic bearing. The magnetic axial bearing includes at least two magnets oriented to attract each other. One magnet is positioned in the spindle of the pump housing while the other is disposed within the rotor assembly, proximate to the spindle. In this respect, the two magnets create an attractive axial force that at least partially maintains the relative axial position of the rotor assembly. The hydrodynamic bearing is formed between sloping surfaces that form tight clearances below the rotor assembly. 120-. (canceled)21. A blood pump comprising:a pump housing;a rotor rotatably disposed in said pump housing;a plurality of ramps located between said pump housing and said rotor to create an axial hydrodynamic bearing surface;each of said plurality of ramps being inclined at an angle relative to horizontal;a flat surface associated with each of said plurality of ramps;each of said flat surfaces extending horizontally relative to said angle of its associated ramp;a passive axial magnetic bearing supporting said rotor comprised of a housing magnet and corresponding rotor magnet wherein magnetic fields of said pump housing magnet and said corresponding rotor magnet are arranged to create a biasing force on the rotor in an axial direction;said plurality of ramps and said passive axial magnetic bearing sized to cooperate with each other so as to suspend said impeller during operation of said pump.22. A blood pump according to claim 21 , wherein claim 21 , said angle ranges between about 0.5 degrees and about 3 degrees.23. A blood pump according to claim 21 , wherein said each of said plurality of ramps is disposed on said rotor.24. A blood pump according to claim 21 , ...

PASSIVE MAGNETIC BEARINGS FOR ROTATING EQUIPMENT INCLUDING INDUCTION MACHINES

Permanent magnet bearings are incorporated into rotating equipment, such as induction machines, in addition to active magnetic or lubricated primary shaft support bearings. The passive magnetic bearings incorporate permanent magnets that generate directionally oriented magnetic fields of selective intensity. The magnetic field directions are aligned with a desired shaft support bearing preload direction and intensity, for example to exert axial thrust or radial preloads on the support bearings. A plurality of magnetic bearings may be oriented in opposed relationship with neutral or offsetting resultant forces. The passive magnetic force preload may be utilized to offset rotor vertical weight during induction startup or stopping cycles. Passive magnetic force preload may be applied to lubricated bearings to assure their operational stability. The passive magnetic bearings can also absorb radial or axial thrust forces imparted on the rotor shaft during induction machine operation, that may reduce machine operational noise, and energy consumption. 1. An induction machine apparatus , comprising:a machine housing;a bearing housing coupled to the machine housing;a stator in the machine housing;a rotor oriented within the stator, having a rotor shaft rotatively captured in the bearing housing;a rotor shaft support bearing, selected from the group consisting of a lubricated bearing and an active magnetic bearing, in the bearing housing, rotatively capturing the rotor shaft; anda permanent magnet bearing in the machine housing, the permanent magnet bearing exerting a directional magnetic force on the rotor shaft that generates a desired intensity and magnitude preload force on the support bearing,wherein the directional magnetic force preloads the support bearing axially.2. The apparatus of claim 1 , wherein the permanent magnet bearing comprises a sector-shaped permanent magnet claim 1 , having an inner concave surface in opposed spaced relationship with the rotor shaft ...

ALTERNATING PUMP GAPS

A blood pump system includes a pump housing and an impeller for rotating in a pump chamber within the housing. The impeller has a first side and a second side opposite the first side. The system includes a stator having drive coils for applying a torque to the impeller and at least one bearing mechanism for suspending the impeller within the pump chamber. The system includes a position control mechanism for moving the impeller in an axial direction within the pump chamber to adjust a size of a first gap and a size of a second gap, thereby controlling a washout rate at each of the first gap and the second gap. The first gap is defined by a distance between the first side and the housing and the second gap is defined by a distance between the second side and the pump housing. 1a chamber;an impeller disposed within the chamber;a motor that drives rotation of the impeller; anda position control mechanism that moves the impeller in an axial direction to alternate the impeller between a first axial position and a second axial position.. A blood pump comprising: This application is a continuation of U.S. patent application Ser. No. 16/443,471, filed on Jun. 17, 2019 and entitled “ALTERNATING PUMP GAPS”, which is a continuation of U.S. patent application Ser. No. 15/041,987, filed Feb. 11, 2016 and entitled “ALTERNATING PUMP GAPS”, which claims priority to U.S. Provisional Application No. 62/115,318, filed Feb. 12, 2015 and entitled “ALTERNATING PUMP GAPS”, which are hereby incorporated by reference in their entirety.The present invention relates in general to pumping devices, and more specifically, to improved blood pumps with levitated impellers and methods for their control.Mechanical circulatory support (MCS) devices are commonly used for treating patients with heart failure. One exemplary type of MCS device is a centrifugal flow blood pump. Many types of circulatory support devices are available for either short term or long term support for patients having ...