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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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28-04-2020 дата публикации

Переносное устройство для намагничивания компенсационных постоянных магнитов

Номер: RU0000197460U1
Автор: Александр Николаевич Вондокурцев
Принадлежит: Общество с ограниченной ответственностью "Газпром трансгаз Ухта"

Полезная модель относится к устройствам, используемым в газовой промышленности, в частности, при восстановлении магнитных свойств компенсационных постоянных магнитов во время сварки кольцевых трубных швов линейной части магистрального газопровода.Задачей полезной модели является проведения работ по полному восстановлению изначальных магнитных свойств (намагничиванию) компенсаторов.Технический результат - создание устройства для намагничивания компенсаторов, способного работать от источника электроэнергии малой мощности в неблагоприятных полевых условиях.Поставленная задача решается, а технический результат достигается в устройстве для намагничивания компенсационных постоянных магнитов, содержащем средство создания магнитного импульса высокой интенсивности, в котором энергия от источника медленно накапливается в батарее конденсаторов, а после достижения необходимого значения разряжается на индукторы кратковременным импульсом большой силы тока. Таким образом, накопитель заряжается током малой силы, следовательно, не требуется мощный источник электроэнергии. Электрическая часть устройства выполнена по простой надёжной схеме, надёжно защищена от внешних воздействий.Устройство выполнено в виде корпуса, оснащённого отверстием для установки компенсационного магнита (подлежащего намагничиванию), органа контроля процесса намагничивания – вольтметра, кнопки «ЗАРЯД»икнопка «РАЗРЯД».Электрическая схема устройства состоит из повышающего трансформатора, выпрямителя, токоограничивающего резистора заряда накопителя, батареи конденсаторов накопителя, мощного тиристора, токоограничивающего резистора цепи управления тиристором, индукторов, разрядного обратного диода. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 197 460 U1 (51) МПК H01F 13/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ПОЛЕЗНОЙ МОДЕЛИ К ПАТЕНТУ (52) СПК H01F 13/003 (2019.08) (21)(22) Заявка: 2019126111, 19.08.2019 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): ...

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Номер записи: 1
16-02-2012 дата публикации

Magnetic Structure Production

Номер: US20120038440A1
Автор: David P. Machado, Dillon Mize, Kelly Loum, Larry W. Fullerton, Mark D. Roberts
Принадлежит: CORRELATED MAGNETICS RESEARCH LLC

Magnetic structure production may relate, by way of example but not limitation, to methods, systems, etc. for producing magnetic structures by printing magnetic pixels (aka maxels) into a magnetizable material. Disclosed herein is production of magnetic structures having, for example: maxels of varying shapes, maxels with different positioning, individual maxels with different properties, maxel patterns having different magnetic field characteristics, combinations thereof, and so forth. In certain example implementations disclosed herein, a second maxel may be printed such that it partially overwrites a first maxel to produce a magnetic structure having overlapping maxels. In certain example implementations disclosed herein, a magnetic printer may include a print head comprising multiple parts and having various properties. In certain example implementations disclosed herein, various techniques for using a magnetic printer may be employed to produce different magnetic structures. Furthermore, description of additional magnet-related technology and example implementations thereof is included herein.

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Номер записи: 2
23-08-2012 дата публикации

Special random magnetization apparatus and process for thin sheet magnetic sheets and rolls

Номер: US20120213942A1
Автор: A. Todd McMullen
Принадлежит: Individual

A magnetization apparatus and process for producing thin magnetized sheets and rolls. It has permanent magnet pieces oriented and magnetized perpendicular to the other components of soft pole piece surfaces. This orientation permits the adjustably controlled field strength of the magnetic field produced. By varying the number of pole pieces and the corresponding permanent magnets the magnetic coupling and magnetic field strength varies. This field variance shifts the aligned poles into a “random orientation”. Therefor the alignment of like poles on the consecutive sheets is avoided and the sheets can lay flat and not be repelled by aligned poles.

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Номер записи: 3
15-11-2012 дата публикации

Field emission system and method

Номер: US20120286913A1
Автор: James L. Richards, Larry W. Fullerton, Mark D. Roberts
Принадлежит: CORRELATED MAGNETICS RESEARCH LLC

An improved field emission system and method is provided that involves field emission structures having electric or magnetic field sources. The magnitudes, polarities, and positions of the magnetic or electric field sources are configured to have desirable correlation properties, which may be in accordance with a code. The correlation properties correspond to a desired spatial force function where spatial forces between field emission structures correspond to relative alignment, separation distance, and the spatial force function.

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Номер записи: 4
18-04-2013 дата публикации

Method and apparatus for demagnetizing generator components prior to electromagnetic core imperfection testing or el-cid testing

Номер: US20130094117A1
Автор: Michael J. Metala, Werner Yzelman
Принадлежит: Siemens Energy Inc

A method and apparatus for determining and for reducing magnetism in a generator stator core ( 20 ). The method includes extending one or more conductors ( 38 ) proximate the core, applying a polarity-reversing excitation voltage to the one or more conductors, and reducing an amplitude of the voltage over time, wherein the voltage causes current to flow in the conductors, the current generating a magnetic field that demagnetizes the core. The method and apparatus are useful for determining hot spots in the core.

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Номер записи: 5
02-05-2013 дата публикации

METHOD AND APPARATUS FOR ACTIVATING AN ELECTRIC MACHINE, AND ELECTRIC MACHINE

Номер: US20130106223A1
Автор: FASOLO Alessandro, Kaessner Thomas
Принадлежит: WILIC S.AR.L.

A method of activating an electric machine having a stator, and a rotor which rotates about an axis with respect to the stator; the stator having a plurality of stator segments arranged about the axis; the rotor having modules made of magnetizable material and arranged about the axis; and the method including the steps of connecting the rotor to the stator by means of a bearing; and magnetizing the modules of magnetizable material when the rotor is connected to the stator. 1. A method of activating an electric machine , said method comprising: [ i) a plurality of modules of magnetizable material, and', '(ii) a pair of magnetic guides having respective first faces and configured to conduct a magnetic flux coupled to said respective modules, and, '(a) the rotor includes a plurality of rotor segments, each rotor segment including;'}, (i) an outer cylinder, and', '(ii) a plurality of slidably removable stator segments arranged about the first axis, wherein at least two of the plurality of stator segments are fitted to the outer cylinder of the stator to define a seat configured to house at least another one of said stator segments;, '(b) the stator includes], 'coupling a rotor to a stator, the rotor configured to rotate about axis with respect to the stator, whereininserting a magnetizing device in the seat, the magnetizing device having two second faces and configured to provide the magnetizing flux;positioning the magnetizing device such that the second faces of the magnetizing device face the first faces of at least one of the pairs of magnetic guides; andafter coupling the rotor to the stator, magnetizing at least one of said plurality of modules of magnetizable material.2. The method of claim 1 , which includes slidably moving the magnetizing device along the rotor segment such that the second faces of the magnetizing device face the first faces of at least another one of the pairs of magnetic guides.3. The method of claim 1 , wherein the modules of the rotor are ...

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Номер записи: 6
23-05-2013 дата публикации

Field Emission System and Method

Номер: US20130128407A1
Автор: Fullerton Larry W., Richards James L., Roherts Mark D.
Принадлежит: Correlated Magnetics Research , LLC.

An improved field emission system and method is provided that involves field emission structures having electric or magnetic field sources. The magnitudes, polarities, and positions of the magnetic or electric field sources are configured to have desirable correlation properties, which may be in accordance with a code. The correlation properties correspond to a desired spatial force function where spatial forces between field emission structures correspond to relative alignment, separation distance, and the spatial force function. 1. A method for producing a magnetic field emission structure , said method comprising the steps of:generating a plurality of magnetic fields by applying a current to a magnetizer comprising a flat metal inductor coil having flat coils and a central hole whose width is smaller than the width of the flat coils; moving in a coordinate system (X,Y,Z) a magnetisable material relative to the magnetizer to a number of appropriate locations;exposing, for each selected location the magnetizable material to the magnetic field produced by said magnetizer; the polarity and magnitude of the magnetic field is controlled to create a plurality of magnetic field sources into said material, said plurality of magnetic field sources having polarities in accordance with elements of a code corresponding to a desired force function.2. The method of claim 1 , wherein said force function corresponds to at least one of a spatial force function or an electromotive force function.3. The method of claim 1 , wherein said code comprises at least one of a complementary code or an anti-complementary code.4. The method of claim 1 , wherein field strengths of said plurality of magnetic field sources are in accordance with said code elements of said code.5. The method of claim 1 , wherein said coil is coupled to a core.6. The method of claim 1 , wherein said core comprises one of Mu-metal claim 1 , permalloy claim 1 , electrical steel claim 1 , or Metglas Magnetic Alloy.7. ...

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Номер записи: 7
06-06-2013 дата публикации

Apparatus and Method for Holding Magnetic Bodies During Their Magnetization and for Inserting the Magnetized Bodies Into a Component of a Magnetic System

Номер: US20130141193A1
Автор: Steingroever Dietrich Alfred
Принадлежит: MAGNET-PHYSIK DR. STEINGROEVER GMBH

For simplifying the handling of magnet bodies during magnetization and for inserting the magnetized magnet bodies into a component of a magnetic system such as an electromagnetic drive, a magnetic travel or angle system or the like, an apparatus is proposed which includes a plurality of cavities for receiving at least one magnet body respectively, wherein the magazine comprises a plurality of interconnected and mutually movable magazine elements. The invention further relates to a method for holding magnet bodies during their magnetization and for inserting the magnetized magnet bodies into a component of a magnetic system and to a magnet body handling system. 1. Apparatus for holding magnet bodies during their magnetization and for inserting the magnetized magnet bodies into a component of a magnetic system such as an electromagnetic drive , a magnetic travel or angle system or the like , characterized in that the apparatus is constructed as a magazine having a plurality of cavities for receiving at least one magnet body respectively , wherein the magazine includes a plurality of interconnected and mutually movable magazine elements and wherein a magazine element has at least one cavity for receiving a magnet body.2. Apparatus according to claim 1 , characterized in that the magazine elements are interconnected in a chain-like manner so that at least one magazine is movably connected to two adjacent magazine elements respectively.3. Apparatus according to claim 1 , characterized in that two motional degrees of freedom are provided between adjacent magazine elements claim 1 , wherein both motional degrees of freedom are rotational degrees of freedom.4. Apparatus according to claim 1 , characterized in that between adjacent magazine elements an elongate connecting element is disposed claim 1 , which is articulated to both adjacent magazine elements in a rotatable manner claim 1 , wherein both assigned rotation axes are oriented parallel to each other.5. Apparatus ...

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Номер записи: 8
04-07-2013 дата публикации

Apparatus and methods for magnetizing and demagnetizing magnetic poles in an electrical machine

Номер: US20130169392A1
Автор: Peter Mongeau
Принадлежит: Vestas Wind Systems AS

Apparatus and methods to magnetize and demagnetize the magnetic poles of a rotor assembly for an electrical machine, such as a generator. The apparatus and methods provide for individually magnetize magnetic domains in the permanent magnetic material of the magnetic poles of a rotor assembly of the electrical machine after the electrical machine is installed in a larger assembly. The magnetization system may be used to magnetize and demagnetize the magnetic poles while the rotor assembly is connected with a prime mover, such a rotor of a wind turbine.

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Номер записи: 9
15-08-2013 дата публикации

Non-Contact Torque Sensor with Permanent Shaft Magnetization

Номер: US20130207757A1
Автор: May Lutz
Принадлежит:

A device for magnetizing an object includes first and second electrode for contacting the object to be magnetized as well as a current generator. The generator is configured to apply a current having a raising current slope and a falling current slope. The falling current slope is steeper than the raising current slope. 115-. (canceled)16. A device for magnetizing an object , comprising:a first electrode and a second electrode contacting the object; anda current generator configured to apply a current having a raising current slope and a falling current slope, the falling current slope being steeper than the raising current slope, a current supply including first and second terminals;', 'a first switch including first and second terminals;', 'an inductance including first and second terminals;', 'a resistance including first and second terminals; and', 'a switch control;, 'wherein the current generator includeswherein the first terminal of the current supply is connected to the second electrode, the second terminal of the current supply being connected to the first terminal of the first switch, the second terminal of the first switch being connected to the first terminal of the inductance, the second terminal of the inductance being connected to the first terminal of the resistance, the second terminal of the resistance being connected to the first electrode, andwherein the switch control is configured to close the first switch for starting a raising current slope.17. A device for magnetizing an object , comprising:a first electrode and a second electrode contacting the object; anda current generator configured to apply a current having a raising current slope and a falling current slope, the falling current slope being steeper than the raising current slope, a current supply including first and second terminals;', 'a first switch including first and second terminals;', 'an inductance including first and second terminals; and', 'a switch control,, 'wherein the ...

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Номер записи: 10
31-10-2013 дата публикации

System and method for authenticating an optical pattern

Номер: US20130284807A1
Автор: Larry W. Fullerton, Mark D. Roberts, Robert Scott Evans
Принадлежит: CORRELATED MAGNETICS RESEARCH LLC

A system for authenticating an optical pattern created by exposing a magnetically sensitive material to one or more magnetic field sources. The system includes illumination sources configured to illuminate the optical pattern, sensors configured to generate sensed optical characteristic data when the optical pattern is illuminated, a memory configured to store a reference optical data associated with a reference optical pattern, and a processor configured to access the memory and compare the reference optical data to the sensed optical characteristic data in order to authenticate the optical pattern.

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Номер записи: 11
28-11-2013 дата публикации

Magnetizer for electrical machines

Номер: US20130314183A1
Автор: Peter Mongeau
Принадлежит: Vestas Wind Systems AS

The present invention relates a device for magnetizing a rotor of an electrical machine with a power rating of at least 1 MW, wherein the rotor comprises permanent magnet material, said device comprising a yoke with an electromagnetic coil arranged to produce a pulsed magnetic field for magnetizing the permanent magnet material, wherein the magnetic field is sufficient to magnetize a permanent magnetic pole wherein the rotor and yoke is in a fixed relation to each other. The invention also relates to a method for magnetization of a rotor with permanent magnets for an electrical machine.

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Номер записи: 12
05-12-2013 дата публикации

Magnetizer utilizing rotated assemblies of permanent magnets

Номер: US20130321111A1
Автор: OBrien Robert Neville
Принадлежит:

Magnetohydrodynamics (MHD) has applications in all electrochemical processes and in a few that are not totally electrochemical in nature. By magnetizing the electrodes or the current collectors through the electrodes so that the vertical, closely and appropriately spaced magnetized electrodes produce a uniform, low magnetic field between them, north pole to south pole, the Lorentz force enhances the natural or forced convection where it is the greatest, very near the electrodes. Because the main internal resistance of an electrochemical process resides in the electrolyte, increasing the speed of transport of charged particles from one electrode to the other greatly reduces this internal resistance. Other treatments such as adding an indifferent paramagnetic ion, an indifferent free radical, completing the magnetic circuit, using a spacer which does not obscure the electrode surface, further reduce the internal resistance, lowering the wasted energy which usually appears as heat in the electrolyte. 1. An electrochemical system composed of an anode and a cathode or a series of anodes and cathodes separated by an electrolyte and held at a constant separation by a separator of indifferent and non-electrically conducting material or as in electrowinning no separator with an arrangement to maintain an efficient and safe gap between the electrodes , with the electrodes magnetized and the magnetic circuit completed externally by a high permeance box or cell tank containing the electrodes , one or more of the constituents of the electrical system capable of being converted to a natural permanent magnetic material ,2. when the electrodes are not ferromagnetic , backed by magnetized current collectors , the electrolyte to be a concentration of between 0.1 M and 10M water or other solvent with a dielectric constant between 5 and 80 and containing the electroactive material in solution and a paramagnetic indifferent ion or free radical of less than 10% by weight ,3. the ...

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Номер записи: 13
30-01-2014 дата публикации

System and method for tailoring polarity transitions of magnetic structures

Номер: US20140028426A1
Автор: Jocob S. Zimmerman, Larry W. Fullerton, Mark D. Roberts, Robert Scott Evans
Принадлежит: CORRELATED MAGNETICS RESEARCH LLC

A system and method for tailoring a polarity transition of a magnetic structure is provided that involves printing one or more reinforcing maxels alongside one side or both sides of a polarity transition boundary between a first polarity region of the magnetic structure having a first polarity and a second polarity region of the magnetic structure having a second polarity, where printing reinforcing maxels alongside the polarity transition boundary improves the magnetic field characteristics of the polarity transition.

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Номер записи: 14
06-02-2014 дата публикации

System and Method for Magnetization

Номер: US20140035707A1
Автор: Evans Robert Scott, Fullerton Larry W., Roberts Mark D.
Принадлежит: Correlated Magnetics Research, LLC.

A system and a method are described herein for magnetizing magnetic sources into a magnetizable material. In one embodiment, the method comprises: (a) providing an inductor coil having multiple layers and a hole extending through the multiple layers; (b) positioning the inductor coil next to the magnetizable material; and (c) emitting from the inductor coil a magnetic field that magnetizes an area on a surface of the magnetizable material, wherein the area on the surface of the magnetizable material that is magnetized is in a direction other than perpendicular to the magnetizable material such that there is a magnetic dipole with both a north polarity and a south polarity formed on the surface of the magnetizable material. 1. A system for magnetizing magnetic sources into a magnetizable material , the system comprising:an inductor coil having multiple layers forming a coil and a hole extending through the multiple layers;a positioning device that positions the inductor coil next to the magnetizable material; andan electrical power source that provides electricity to the inductor coil such that the inductor coil emits a magnetic field that magnetizes an area on a surface of the magnetizable material, wherein the area on the surface of the magnetizable material is magnetized in a direction other than perpendicular to the magnetizable material such that there is a magnetic dipole with both a north polarity and a south polarity formed on the surface of the magnetizable material.2. The system of claim 1 , wherein the positioning device is further configured to tilt the inductor coil with respect to the magnetizable material such that the inductor coil emits the magnetic field to magnetize the area of the surface of the magnetizable material in a direction other than perpendicular to the magnetizable material and other than parallel to the magnetizable material.3. The system of claim 1 , further comprising a protective layer which is placed between the inductor coil and ...

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Номер записи: 15
11-01-2018 дата публикации

METHOD OF FABRICATING A SHAPE-CHANGEABLE MAGENTIC MEMBER, METHOD OF PRODUCING A SHAPE CHANGEABLE MAGNETIC MEMBER AND SHAPE CHANGEABLE MAGNETIC MEMBER

Номер: US20180012693A1
Автор: Lum Guo Zhan, Sitti Metin, Ye Zhou
Принадлежит:

The present invention relates to a method of fabricating a shape-changeable magnetic member comprising a plurality of segments with each segment being able to be magnetized with a desired magnitude and orientation of magnetization, to a method of producing a shape changeable magnetic member composed of a plurality of segments and to a shape changeable magnetic member. 1. A method of fabricating a shape-changeable magnetic member comprising a plurality of segments with each segment being able to be magnetized with a desired magnitude and orientation of magnetization , the method comprising the steps of:defining a first shape of the member;defining at least one second shape the member can adopt through the application of at least one magnetic field;determining a desired orientation and magnitude of magnetization for each of the plurality of segments, such that the member can at least approximately change its shape from the first shape to the at least one second shape through the application of the at least one magnetic field; andproducing the member by forming each segment such that it at least substantially has the respective desired orientation and magnitude of magnetization when the member adopts the first shape in the absence of the at least one magnetic field.4. The method in accordance with claim 1 , wherein the step of producing the member includes the step of providing at least one mold into which a first mixture composed of at least an elastic material and a magnetizable material is introduced claim 1 , with the shape of the mold defining the magnitude of the magnetization of the shape-changeable magnetic member or with the member being cut from a material formed in a mold to have a desired shape that can have the defined magnitude of the magnetization of the shape-changeable magnetic member or with a shape of the member being printed by use of a 3D printer.5. The method in accordance with claim 1 , wherein the step of producing the member includes the step ...

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Номер записи: 16
15-01-2015 дата публикации

INITIALIZATION OF MAGNETIC FEATURES

Номер: US20150015353A1
Автор: McLaurin Stephen Keith, Xu Weilu
Принадлежит: SEAGATE TECHNOLOGY LLC

The embodiments disclose an alternating current (AC) erase process configured to cancel out existing polarity of stack magnetic features on both sides of the stack and an AC reset process configured to initialize the polarity of the device stack magnetic features of both sides of a stack configured to create a uniform polarity. 1. A method for simultaneous initialization of magnetic features , comprising:erasing a polarity of stack magnetic features on both sides of a stack using an alternating current (AC) erase process; andinitializing the polarity of the stack magnetic features of both sides of the stack using an AC reset to create a uniform polarity.2. The method of claim 1 , further comprising using the AC erase process simultaneously on both sides of the stack magnetic features to cancel out the existing polarity using a first magnet.3. The method of claim 1 , further comprising changing out and replacing a first magnet with a second magnet.4. The method of claim 1 , wherein the AC reset includes initializing the media so all the magnetic features are magnetized in a same direction on both sides of the stack simultaneously using a second magnet.5. The method of claim 1 , wherein the AC erase includes taking total energy of the stack including a disc or magnetization back to a zero point.6. The method of claim 1 , wherein the AC erase includes taking media back to a low energy state so that all signals are eliminated.7. The method of claim 1 , wherein the stack comprises a bit patterned media claim 1 , perpendicular claim 1 , or other magnetic recording formats.8. The method of claim 1 , further comprising testing the polarity of centers of the stack magnetic features using a second magnet.9. The method of claim 8 , wherein the testing of the polarity of the centers of the stack magnetic features includes checking each magnetic feature center.10. The method of claim 8 , wherein testing the polarity of the centers of the stack magnetic features includes checking ...

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Номер записи: 17
15-01-2015 дата публикации

METHOD AND APPARATUS FOR DEMAGNETIZING TRANSFORMER CORES IN CLOSED LOOP MAGNETIC CURRENT SENSORS

Номер: US20150016006A1
Автор: Haug Gebhard, Ivanov Mikhail Valeryevich, UDAYASHANKAR Sudarshan, van Vroonhoven Caspar Petrus Laurentius
Принадлежит: TEXAS INSTRUMENTS DEUTSCHLAND GMBH

Automated degaussing methods and apparatus are presented for degaussing a magnetic core in close loop fashion, in which a plurality of pulses are applied to a compensation coil magnetically coupled with the core with duration or energy being decreased in succeeding pulse cycles according to a discrete feedback algorithm, and with individual pulse polarities being set according to core magnetization polarity measured subsequent to an immediately preceding pulse. 1. An automatic degaussing apparatus for degaussing a magnetic core , comprising:sensor interface circuitry configured to receive a signal from a sensor proximate the core and to provide an output signal indicating a magnetization polarity of the core;coil interface circuitry with first and second outputs coupleable with corresponding first and second ends of a compensation coil magnetically coupled with the core, the coil interface circuitry configured to selectively individually couple the first and second outputs to a pulse voltage supply node or to a common node; andcontrol circuitry configured to automatically cause the coil interface circuitry to selectively apply a plurality of pulses to the core via the compensation coil, and to control a polarity and an energy of the individual pulses at least partially according to the output signal from the sensor interface circuitry to at least partially demagnetize the core in a closed-loop fashion using a discrete feedback algorithm.2. The apparatus of claim 1 , wherein the control circuitry is configured to cause the coil interface circuitry to selectively apply the plurality of pulses in a corresponding plurality of pulse cycles claim 1 , the individual pulse cycles comprising:connection of a given one of the first and second outputs to the pulse voltage supply node and concurrent connection of the other one of the first and second outputs to the common node in a first state, andconnection of both of the first and second outputs to the common node in a second ...

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Номер записи: 18
21-01-2016 дата публикации

APPARATUS AND METHODS FOR MAGNET RETENTION

Номер: US20160020008A1
Автор: Birchall Jeffrey George, Powell David James
Принадлежит:

An apparatus and method for holding permanent magnet components, particularly on a rotor of an electrical machine. A magnet carrier () comprises a channel () suitable for receiving an encircling magnet retainer () and a method of manufacturing a magnet assembly () comprises providing a magnet carrier () comprising a channel (), mounting a magnet () on the magnet carrier (), and encircling the magnet () and magnet carrier () with a magnet retainer (), wherein the magnet retainer () passes through the channel (). 1. A magnet assembly comprising:a magnet carrier comprising a channel suitable for receiving an encircling magnet retainer;a permanent magnet; anda magnet retainer which encircles the carrier and the permanent magnet, wherein the magnet retainer passes through the channel.2. The magnet carrier of wherein the magnet carrier is made of ferromagnetic material.3. (canceled)4. The magnet carrier of wherein a floor of the channel is chamfered claim 1 , rounded claim 1 , or both.5. (canceled)6. The magnet carrier of comprising a plurality of channels suitable for receiving an encircling magnet retainer.79-. (canceled)10. The magnet assembly of wherein the magnet retainer comprises fibre filament.11. (canceled)12. (canceled)13. The magnet assembly of wherein the magnet retainer further comprises an epoxy.14. The magnet assembly of wherein the magnet retainer is thinner on a face of the magnet than it is in the channel.15. (canceled)16. The magnet assembly of wherein the channel has a width claim 1 , and the magnet retainer has a greater width on a face of the magnet than the width of the channel.17. The magnet assembly of wherein the magnet is a laminated magnet.1820-. (canceled)21. A permanent magnet rotor comprising a plurality of magnet assemblies according to .2225-. (canceled)26. A method of manufacturing a magnet assembly comprisingproviding a magnet carrier comprising a channel;mounting permanent magnet material on the magnet carrier; andencircling the ...

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Номер записи: 19
17-04-2014 дата публикации

System and Method for Demagnetization of a Magnetic Structure Region

Номер: US20140104021A1
Автор: Fullerton Larry W., Moore Hamilton Grant, Roberts Mark D.
Принадлежит: Correlated Magnetics Research, LLC.

A system and a method are described herein for demagnetizing a region of a magnetic structure. In one embodiment, the system comprises: (a) a pulsed magnetizer; and (b) at least one magnetizing coil that receives a sequence of discrete currents with continually decreasing current values from the pulsed magnetizer and outputs a sequence of discrete magnetizing fields with continually decreasing field strengths to overwrite and at least partly demagnetize the region of the magnetic structure. The at least one magnetizing coil is located adjacent to the region of the magnetic structure. 1. A system for demagnetizing a region of a magnetic structure , the system comprising:a pulsed magnetizer; andat least one magnetizing coil that receives a sequence of discrete currents with continually decreasing current values from the pulsed magnetizer and outputs a sequence of discrete magnetizing fields with continually decreasing field strengths to overwrite and at least partly demagnetize the region of the magnetic structure, and wherein the at least one magnetizing coil is located adjacent to the region of the magnetic structure.2. The system of claim 1 , wherein the at least one magnetizing coil receives the sequence of discrete currents with continually decreasing current values from the pulsed magnetizer and outputs the sequence of discrete magnetizing fields with the continually decreasing field strengths and alternating polarities to overwrite and at least partly demagnetize the region of the magnetic structure.3. The system of claim 1 , wherein the at least one magnetizing coil receives the sequence of discrete currents with continually decreasing current values from the pulsed magnetizer and outputs a first portion of the sequence of discrete magnetizing fields with the continually decreasing field strengths and a first polarity and then outputs a second portion of the sequence of discrete magnetizing fields with the continually decreasing field strengths and a second ...

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Номер записи: 20
22-01-2015 дата публикации

System and Method for Producing Magnetic Structures

Номер: US20150022298A1
Автор: Fullerton Larry W.
Принадлежит: Correlated Magnetics Research, LLC

An improved system and method for producing magnetic structures involves a first magnetizing circuit having a first inductor coil used to magnetically print a first magnetic source onto a magnetizable material and a second magnetizing circuit having a second inductor coil used to magnetically print a second magnetic source onto said magnetizable material. 1. A system for producing magnetic structures , comprising:a first magnetizing circuit having a first inductor coil used to magnetically print a first magnetic source onto a magnetizable material; anda second magnetizing circuit having a second inductor coil used to magnetically print a second magnetic source onto said magnetizable material.2. The system of claim 1 , wherein said first magnetic source has a first polarity and said second magnetic source has a second polarity that is opposite said first polarity.3. The system of claim 1 , further comprising:a magnetic shielding layer.4. The system of claim 1 , further comprising:a heat sink.5. The system of claim 1 , further comprising:a magnetic field measurement device.6. The system of claim 1 , wherein said first inductor coil prints a plurality of magnetic sources onto said magnetizable material.7. The system of claim 1 , wherein said second inductor coil prints a plurality of magnetic sources onto said magnetizable material.8. The system of claim 1 , further comprising:a control system for controlling the printing by said first inductor coil relative to a movement of said magnetizable material.9. The system of claim 1 , further comprising:a control system for controlling the printing by said second inductor coil relative to a movement of said magnetizable material.10. The system of claim 1 , said first inductor coil including a plurality of layers of a flat metal conductor configured to produce a plurality of inductive turns about a hole claim 1 , said first inductor coil generating a magnetizing field having a high magnetic flux density in and/or near said ...

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Номер записи: 21
24-04-2014 дата публикации

SYSTEM AND METHOD FOR PRODUCING MAGNETIC STRUCTURES

Номер: US20140111296A1
Автор: Fullerton Larry W., Roberts Mark D., Straus Stephen D.
Принадлежит: Correlated Magnetics Research, LLC

A system for producing magnetic structures includes multiple magnetizing circuits and multiple inductor coils used to magnetically print multiple magnetic sources onto multiple pieces of magnetizable material. The multiple pieces of magnetizable material may be moving on a motion control system. The multiple inductor coils may be configured on one or more gantries. The motion control system may be a conveyor system. 1. A system for producing magnetic structures , comprising:a first magnetizing circuit having a first inductor coil used to magnetically print a first magnetic source onto a magnetizable material; anda second magnetizing circuit having a second inductor coil used to magnetically print a second magnetic source onto said magnetizable material.2. The system of claim 1 , wherein said first magnetic source has a first polarity and said second magnetic source has a second polarity that is opposite said first polarity.3. The system of claim 1 , wherein said first magnetic source has a first polarity and said second magnetic source has said first polarity.4. The system of claim 1 , further comprising:a mechanism associated with said first inductor coil for providing a force to said magnetizable material.5. The system of claim 1 , further comprising:a first gantry for supporting said first inductor coil.6. The system of claim 5 , further comprising:a servo motor for moving said first inductor coil along said first gantry.7. The system of claim 5 , wherein said first gantry also supports said second inductor coil.8. The system of claim 5 , further comprising:a second gantry for supporting said second inductor coil.9. The system of claim 1 , further comprising:a magnetic shielding layer.10. The system of claim 1 , further comprising:a heat sink.11. The system of claim 1 , further comprising:a rack mount system.12. The system of claim 11 , wherein said first magnetic circuit is configured as a first rack mount magnetization module.13. The system of claim 12 , ...

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Номер записи: 22
10-02-2022 дата публикации

METHODS FOR TAILORING MAGNETISM, AND STRUCTURES OBTAINED THEREFROM

Номер: US20220044870A1
Автор: CLOUGH Eric, HENRY Christopher, LAPLANT Darby, SCHAEDLER Tobias, SUCICH Amber, YAHATA Brennan
Принадлежит:

This invention provides methods for fabricating a hard or soft magnet with tailorable magnetic and crystallographic orientations. Methods are disclosed to individually tailor three-dimensional voxels for selected crystallographic orientations and, independently, selected magnetic orientations with location specificity throughout a magnet. Some variations provide a method of making a magnet, comprising: providing a feedstock composition containing magnetic or magnetically susceptible materials; exposing the feedstock composition to an energy source for melting, thereby generating a first melt layer; solidifying the first melt layer in the presence of an externally applied magnetic field, thereby generating a magnetic metal layer containing a plurality of individual voxels; optionally repeating to generate a plurality of solid layers; and recovering a magnet comprising the magnetic metal layer(s), wherein the externally applied magnetic field has a magnetic-field orientation that is selected to control a magnetic axis and a crystallographic texture within the magnetic metal layer(s). 1. A method of making a magnet with tailored magnetism , said method comprising:(a) providing a feedstock composition containing one or more magnetic or magnetically susceptible materials;(b) exposing a first amount of said feedstock composition to an energy source for melting in a scan direction, thereby generating a first melt layer;(c) solidifying said first melt layer in the presence of an externally applied magnetic field, thereby generating a magnetic metal layer containing a plurality of individual voxels;(d) optionally repeating steps (b) and (c) a plurality of times to generate a plurality of solid layers by sequentially solidifying a plurality of melt layers in a build direction, thereby generating a plurality of magnetic metal layers; and(e) recovering a magnet comprising said magnetic metal layer,wherein said externally applied magnetic field has a magnetic-field orientation, ...

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Номер записи: 23
23-01-2020 дата публикации

CARRIER, VACUUM SYSTEM AND METHOD OF OPERATING A VACUUM SYSTEM

Номер: US20200027767A1
Автор: SAUER Andreas, ZANG Sebastian Gunther
Принадлежит: Applied Materials, Inc.

A carrier for use in a vacuum system is described. The carrier includes: a magnet arrangement including one or more first permanent magnets; one or more second permanent magnets; and a magnet device configured to change a magnetization of the one or more first permanent magnets. The carrier may be used for carrying a mask device or a substrate in the vacuum system. Further, a vacuum system and a method of operating a vacuum system are described. 1. A carrier for use in a vacuum system , comprising: one or more first permanent magnets; and', 'one or more second permanent magnets; and, 'a magnet arrangement, includinga magnet device configured to change a magnetization of the one or more first permanent magnets.2. The carrier of claim 1 , wherein the one or more first permanent magnets comprise a soft or semi-hard magnetic material claim 1 , and wherein the one or more second permanent magnets comprise a hard magnetic material claim 1 , particularly including neodymium.3. The carrier of claim 1 , wherein the magnet arrangement is an electropermanent magnet arrangement.4. The carrier of claim 3 , wherein the magnet device comprises a winding provided at least partially around the one or more first permanent magnets.5. The carrier of claim 3 , wherein a direction of magnetization of the one or more first permanent magnets is switchable by an electric pulse provided to the magnet device.6. The carrier of claim 1 , further comprising:{'b': '30', 'a carrier body, wherein the magnet arrangement is attached to or integrated with the carrier body, and wherein the magnet arrangement () is configured to hold a mask device or a substrate at a holding surface of the carrier body.'}7. The carrier of claim 6 , wherein the magnet arrangement is switchable between a chucking state and a releasing state claim 6 , wherein claim 6 , in the chucking state claim 6 , the magnet arrangement generates a first external magnetic field at the holding surface claim 6 , and wherein claim 6 , in ...

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Номер записи: 24
05-02-2015 дата публикации

Driving apparatus, charged particle beam irradiation apparatus, and method of manufacturing device

Номер: US20150033546A1
Автор: Shinji Uchida
Принадлежит: Canon Inc

A driving apparatus includes an electromagnetic actuator configured to generate a motive power by an electromagnetic force; movable portions configured to be moved by the electromagnetic actuator, and a magnetic shield unit including a first magnetic shield and a second magnetic shield that surround the electromagnetic actuator in this order, and from a side closer to a magnetic field generating portion of the electromagnetic actuator. An opening through which a demagnetizing coil penetrates provided on at least one of the magnetic shields is opposite to the first magnetic shield or the second magnetic shield in a part of the area of the opening.

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Номер записи: 25
22-02-2018 дата публикации

Iron-based superconducting permanent magnet and method of manufacture

Номер: US20180053587A1
Автор: Akiyasu Yamamoto, Eric Hellstrom, Jeremy Weiss
Принадлежит: Florida State University Research Foundation Inc, JAPAN SCIENCE AND TECHNOLOGY AGENCY

The present invention provides for polycrystalline superconducting permanent magnets which are synthesized of doped superconducting (AE) Fe 2 As 2 compounds, where AE denotes an alkaline earth metal, such as Ba, Sr, Mg or Ca. The superconducting permanent magnets of the present invention can be magnetized in their superconducting state by induced currents, resulting in trapped magnetization that scales with the size of the bulk material. The magnitude of the trapped field has been demonstrated to be over 1 T and is predicted to be over 10 T if the technology is scaled, which is much higher than the capabilities of permanent magnets and other superconducting polycrystalline bulks currently known in the art.

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Номер записи: 26
13-02-2020 дата публикации

Magnetizer and Demagnetizer

Номер: US20200051726A1
Автор: Daniel Pearson
Принадлежит: Individual

A device for magnetizing and demagnetizing a ferrous object, such as a screwdriver, said device having a plurality of magnets disposed about at least one magnetization opening and beside at least one demagnetization opening, said demagnetization opening configured such that the location and orientation of the ferrous object are fixed relative to the magnets and optimized for demagnetization.

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Номер записи: 27
05-03-2015 дата публикации

Portable Magnetizer Sheet Feeder System

Номер: US20150061800A1
Автор: Richard D. Lefevre
Принадлежит: Magnum Magnetics Corp

A sheet-feeder system for multiple feeding of magnetizable sheets from a stack through a portable magnetizer designed for on-site use, enclosed in a portable case which is hand-carryable. A sheet advancer advances single magnetizable sheets from the stack in a stack positioner. The sheet advancer includes a single-sheet separator configured to separate single magnetizable sheets from the stack during advancement. Magnetic attraction between a magnetizable sheet and a magnetic field generated by a sheet magnetizer configured to permanently magnetize single magnetizable sheets as they are advanced by the sheet advancer assists the sheet advancer to advance the single magnetizable sheets from the stack through the sheet magnetizer.

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Номер записи: 28
01-03-2018 дата публикации

Cover For Tissue Penetrating Device With Integrated Magnets And Magnetic Shielding

Номер: US20180061546A1
Автор: "OBryan Jeffrey C.", Burkholz Jonathan Karl, HARDING Weston, Isaacson S. Ray, Ma Yiping
Принадлежит:

A cover for magnetizing a shaft of a tissue-penetrating medical device is disclosed including a sleeve member having a hollow body to form a protective closure over the shaft of the tissue-penetrating medical device. The proximal end of the hollow body provides a receiving space for receiving the shaft of the tissue-penetrating medical device. One or more magnet is disposed on the sleeve member. A magnetic shield composed of one or more shielding materials associated with the cover that minimizes any effects to the clinical environment from magnetic fields generated within the cover. Medical devices and methods of magnetizing the shaft of a tissue-penetrating medical device using the cover are also disclosed. 1. A cover for magnetizing a tissue-penetrating medical device comprising:a sleeve member having a hollow body with an exterior surface, an interior surface, a proximal end, and a distal end to form a protective closure over a shaft of a tissue-penetrating medical device having a longitudinal axis, the proximal end of the hollow body providing a receiving space for receiving at least a shaft of the tissue-penetrating medical device;one or more magnets disposed along the sleeve member effective to magnetize the shaft; anda magnetic shield composed of one or more shielding materials associated with the cover, a first face of the one or more magnets being exposed to the receiving space and an opposite face of the one of one or more magnets being exposed to the magnetic shield.2. The cover of claim 1 , wherein the receiving space permits movement of the shaft of the tissue-penetrating medical device in the receiving space in a direction parallel to the longitudinal axis of the tissue-penetrating medical device.3. The cover of claim 1 , wherein the receiving space permits movement of the shaft of the tissue-penetrating medical device into and out of the receiving space.4. The cover of claim 1 , wherein the two or more magnets are disposed along the interior surface ...

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Номер записи: 29
28-02-2019 дата публикации

IMMUNITY FROM MAGNETIC DISTURBANCE FOR A MAGNETIC LOCATION TRACKER

Номер: US20190059785A1
Автор: Boumendil Alon, Gliner Vadim, Govari Assaf
Принадлежит: Biosense Webster (Israel) Ltd.

Apparatus, including a ferromagnetic sheet and at least one radiator, mounted in proximity to the ferromagnetic sheet and configured to radiate a magnetic field into a region in proximity thereto. The apparatus further includes a solid sheet of thermal insulation, mounted between the ferromagnetic sheet and the at least one radiator so as to prevent transfer of thermal energy from the at least one radiator to the ferromagnetic sheet. 1. A method , comprising , providing a ferromagnetic sheet; mounting at least one radiator in proximity to the ferromagnetic sheet and configuring the at least one radiator to radiate a magnetic field into a region in proximity thereto; and mounting a solid sheet of thermal insulation between the ferromagnetic sheet and the at least one radiator so as to prevent transfer of thermal energy from the at least one radiator to the ferromagnetic sheet.2. The method according to claim 1 , wherein the solid sheet has a thermal conductivity of no more than 0.7 W·m−1·K−1.3. The method according to claim 1 , wherein the solid sheet comprises wood.4. The method according to claim 1 , wherein the solid sheet comprises a carbon fiber sheet.5. The method according to claim 1 , wherein the ferromagnetic sheet comprises galvanized iron.6. The method according to claim 1 , wherein the ferromagnetic sheet comprises a soft magnetic material having a coercivity less than 2 Oersted.7. The method according to claim 1 , wherein the magnetic field causes the ferromagnetic sheet to operate in an unsaturated manner.8. The method according to claim 1 , wherein the at least one radiator comprises a coil generating a magnetic image of the coil in the ferromagnetic sheet claim 1 , and wherein a distance between the ferromagnetic sheet and the at least one radiator is set so that the magnetic image radiates an image magnetic field having a distortion of less than 0.1% of the magnetic field.9. The method according to claim 1 , wherein the solid sheet of thermal ...

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Номер записи: 30
02-03-2017 дата публикации

MAGNETIZING APPARATUS AND MAGNETIZING METHOD

Номер: US20170062112A1
Автор: ENOMOTO Tadashi, Saito Makoto
Принадлежит:

Disclosed is a magnetizing apparatus including: a placing table configured to place thereon a storage container storing a plurality of substrates; a magnetizing chamber configured to accommodate the storage container and apply a magnetic field to the plurality of substrates in the storage container; and a conveying mechanism configured to convey the storage container from the placing table into the magnetizing chamber. 1. A magnetizing apparatus comprising:a placing table configured to place thereon a storage container storing a plurality of substrates;a magnetizing chamber configured to accommodate the storage container and apply a magnetic field to the plurality of substrates in the storage container; anda conveying mechanism configured to convey the storage container from the placing table into the magnetizing chamber.2. The magnetizing apparatus of claim 1 , wherein the storage container is a sealed type container made of a non-magnetic material claim 1 , andthe conveying mechanism conveys the storage container in a sealed state from the placing table into the magnetizing chamber.3. The magnetizing apparatus of claim 2 , wherein the storage container is a front opening unified pod (FOUP) configured to store twenty five (25) substrates.4. The magnetizing apparatus of claim 1 , wherein the conveying mechanism grips the storage container from a top surface side of the storage container claim 1 , and conveys the storage container.5. The magnetizing apparatus of claim 1 , wherein the magnetizing chamber applies a magnetic field to the plurality of substrates at room temperature.6. The magnetizing apparatus of claim 1 , wherein the magnetizing chamber includes:a vertical type solenoid magnet;a holding unit provided to be movable vertically inside the solenoid magnet and configured to hold the storage container; anda driving mechanism configured to move the holding unit vertically.7. The magnetizing apparatus of claim 1 , wherein the magnetizing chamber includes:a ...

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Номер записи: 31
02-03-2017 дата публикации

METHOD FOR PRODUCING PERMANENT MAGNET MAGNETIC CIRCUIT

Номер: US20170062126A1
Автор: HASHIMOTO SHINGO
Принадлежит:

There is provided a method for producing a permanent magnet magnetic circuit that makes it possible to stably attach a permanent magnet to a yoke and to use a general-purpose assembly jig or to reuse an existing assembly jig even when the size or shape of a magnet to be attached is changed. More specifically, there is provided a method for producing the circuit comprising a magnet or magnet unit and a yoke, the method comprising the steps of: fixing the magnet or magnet unit to an assembly jig through an electrically detachable adhesive; fixing the magnet or magnet unit fixed to the jig, to the yoke; and applying a voltage between the magnet or magnet unit and the assembly jig to detach the adhesive from the magnet or magnet unit to detach the adhesive from the jig so as to detach the magnet from the jig. 1. A method for producing a permanent magnet magnetic circuit comprising a permanent magnet or magnet unit having a permanent magnet fixed to a backplate and a yoke on which the permanent magnet or magnet unit is placed , the method comprising the steps of:fixing the permanent magnet or magnet unit to an assembly jig through an electrically detachable adhesive;fixing the permanent magnet or magnet unit, which has been fixed to the assembly jig, to the yoke; andapplying a voltage between the permanent magnet or magnet unit and the assembly jig to detach the electrically detachable adhesive from the permanent magnet or magnet unit or to detach the electrically detachable adhesive from the assembly jig so as to detach the permanent magnet or magnet unit from the assembly jig.2. The method for producing a permanent magnet magnetic circuit according to claim 1 , wherein the permanent magnet or magnet unit is a magnet unit claim 1 , and an electric resistance regulator plate is inserted between the backplate and the electrically detachable adhesive or between the electrically detachable adhesive and each of the permanent magnet and the backplate before the step of fixing ...

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Номер записи: 32
12-03-2015 дата публикации

ELIMINATING ANHYSTERETIC MAGNETISM IN FERROMAGNETIC BODIES

Номер: US20150070117A1
Автор: Maurer Albert, Meyer Urs
Принадлежит:

The aim is to improve the demagnetisation of ferromagnetic components by means of simple enhancements of a demagnetising device in such a manner that, in spite of the demagnetisation at approximately room temperature, ferromagnetic components with vanishingly low residual magnetism, as was previously only achievable by means of thermal demagnetisation, are achieved. This is achieved in that a chamber with walls made from magnetically highly-permeable ferromagnetic material for shielding from external interference fields, for example the magnetic field of the Earth, is used in the demagnetising coil of a demagnetising device, whereby an interference-field-free chamber interior is pushed with a reduction of the interference field strength in the chamber interior to such a small magnetic interference field, that the residual magnetism at the treated objects has a lower value after demagnetisation than the interference field outside of the chamber space. 1. A method of using a chamber with walls made from magnetically highly-permeable ferromagnetic material for shielding from external interference fields , the walls configured to achieve an interference-field-free chamber interior with a reduction of an interior interference-field strength in the chamber interior to less than half of an exterior interference field strength outside of the chamber interior , the method comprising:initiating a demagnetisation of a ferromagnetic component along a predetermined demagnetisation curve in a demagnetising coil within the chamber interior; andduring the demagnetisation of the ferromagnetic component, applying an attenuating magnetic alternating field within the demagnetising coil.2. The method according to claim 1 , wherein the walls of the chamber have at least one layer made from a material that conducts electricity well claim 1 , particularly from copper claim 1 , silver or aluminium.3. The method according to claim 1 , wherein the demagnetising coil is arranged in the chamber ...

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Номер записи: 33
10-03-2016 дата публикации

Lithographic apparatus and device manufacturing method

Номер: US20160070181A1
Автор: George Arie Jan De Fockert, Gerardus Lucien Mathildus Jansen, Petrus Carolus Maria Frissen
Принадлежит: ASML Netherlands BV

A magnetization tool for post-assembly magnetization of a magnet assembly including a main coil, an end surface of the main coil configured to be positioned substantially parallel to an outer surface of the magnet assembly for magnetizing a magnetic pole of the magnet assembly, the main coil being configured to generate a magnetic field and a shielding arrangement positioned adjacent the main coil in a plane substantially parallel to the end surface of the main coil, whereby the shielding arrangement is configured to generate a shielding magnetic field, whereby a resulting magnetic field of the shielding magnetic field and the magnetic field is substantially only protruding the magnetic pole of the magnet assembly and directly adjacent magnetic poles of the magnet assembly such that the magnetic pole of the magnet assembly and the directly adjacent magnetic poles of the magnetic pole have a substantially opposite polarity.

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Номер записи: 34
09-03-2017 дата публикации

METHOD AND APPARATUS FOR NON-CONTACT AXIAL PARTICLE ROTATION AND DECOUPLED PARTICLE PROPULSION

Номер: US20170069416A9
Автор: MAIR Lamar Odell, Nacev Aleksandar Nelson, WEINBERG Irving N.
Принадлежит:

An apparatus and method for magnetic particle manipulation enables the particle to be rotated and translated independently using magnetic fields and field gradients, which produce the desired decoupled translational and rotational motion. The apparatus and the method for manipulation may be implemented in parallel, involving many particles. The rotational magnetic field used to induce rotational motion may be varied to induce particle motion, which is either in phase or out of phase with the rotational magnetic field. The magnetic fields and gradients described herein may be generated with permanent magnets, electromagnets, or some combination of permanent magnets and electromagnets. 1. An apparatus for rotating and translating at least one particle , the apparatus comprising:means for generating magnetic force and torque; andat least one particle, wherein at least some portion of the at least one particle contains a magnetizable material,wherein the generated magnetic force is applied to at least some portion of the at least one particle to cause translational motion of the particle, 'wherein the ratio of the translational and rotational velocities of the particle is variable.', 'wherein the generated magnetic torque is applied to at least some other portion of the same at least one particle to cause rotation of the particle, and'}2. The apparatus of claim 1 , wherein the particle is introduced in a body claim 1 , and a ratio of the translational and rotational velocities of the particle is varied while the particle is in the body.3. The apparatus of claim 1 , wherein the means for generating magnetic force includes means for generating a rotational field ranging from 1 Hz to 1000 Hz.4. The apparatus of claim 1 , wherein the at least one particle is composed of polymeric claim 1 , metallic claim 1 , insulating claim 1 , semiconducting claim 1 , ceramic claim 1 , or combinations of at least two of these materials.5. The apparatus of claim 1 , wherein the at least ...

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Номер записи: 35
05-06-2014 дата публикации

Magnetic Structure Production

Номер: US20140152407A1
Автор: Fullerton Larry W., Roberts Mark D.
Принадлежит: Correlated Magnetics Research, LLC.

Magnetic structure production may relate, by way of example but not limitation, to methods, systems, etc. for producing magnetic structures by printing magnetic pixels (aka maxels) into a magnetizable material. Disclosed herein is production of magnetic structures having, for example: maxels of varying shapes, maxels with different positioning, individual maxels with different properties, maxel patterns having different magnetic field characteristics, combinations thereof, and so forth. In certain example implementations disclosed herein, a second maxel may be printed such that it partially overwrites a first maxel to produce a magnetic structure having overlapping maxels. In certain example implementations disclosed herein, a magnetic printer may include a print head comprising multiple parts and having various properties. In certain example implementations disclosed herein, various techniques for using a magnetic printer may be employed to produce different magnetic structures. Furthermore, description of additional magnet-related technology and example implementations thereof is included herein. 1. An apparatus for printing maxels into a magnetizable material , the apparatus comprising:a magnetic print head comprising a flat metal conductor having a plurality of layers forming an inductor coil and a hole extending through the plurality of layers, said magnetic print head configured to generate a magnetizing field having a high magnetic flux density in and near said hole and a low magnetic flux density elsewhere when a current is applied to said magnetic print head;a first circuitry that causes at least one of a magnetizable material and the magnetic print head to move to position said hole of said magnetic print head adjacent to a first location at a surface of said magnetizable material where a maxel is to be printed; anda second circuitry that interacts with said magnetic print head to print a first maxel at the first location at the surface of said ...

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Номер записи: 36
05-03-2020 дата публикации

MAGNETICALLY ATTRACTIVE LAP DESKS AND METHODS OF MAKING THE SAME

Номер: US20200070043A1
Автор: Nance Beverly Ann
Принадлежит:

A method of modifying a non-magnetic surface to become magnetic enables magnetic puzzle pieces to be assembled thereon. The invention also includes the resulting modified article, which may be portable, enabling the magnetic lap desk to be transported from palace to place, including transportation by young children. A magnetic paint or primer is used to convert at least the top surface of the lap desk or other article. A further advantage of the invention is that since a user applies the paint or over-coats, different proprietary colors and/or designs may be achieved. 1. A method of transforming an article into a magnetically attractive article , comprising the steps of:providing a lap desk having an upper surface;applying one or more coats of magnetic paint or primer to the upper surface of the lap desk; andallowing the one or more coats of magnetic paint or primer to dry.2. The method of claim 1 , including the steps of:providing a magnetic jigsaw puzzle having a plurality of magnet pieces; andassembling the magnetic jigsaw puzzle on the coated surface of the lap desk.3. The method of claim 1 , wherein the lap desk is made of wood.4. The method of claim 1 , wherein at least the surface of the lap desk is made of a faux wood.5. The method of claim 1 , wherein:the upper surface of the lap desk includes one or more trays; andavoiding the one or more trays with the one or more coats of magnetic paint or primer.6. The method of claim 1 , further including the step of applying one or more top coats over the one or more coats of magnetic paint or primer to achieve a desired appearance.7. A lap desk modified in accordance with the method of .8. A lap desk modified in accordance with the method of .9. A lap desk modified in accordance with the method of .10. A lap desk modified in accordance with the method of . This application claims priority to, and the benefit of U.S. Provisional Patent Application Ser. No. 62/724,883, filed Sep. 7, 2018, the entire content of which is ...

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Номер записи: 37
19-03-2015 дата публикации

MANUFACTURING METHOD AND MANUFACTURING APPARATUS FOR PRINTING MAGNETIC ORIENTATION MASTER AND MAGNETIC PIGMENT PRESSWORK

Номер: US20150079305A1
Автор: Huang Qian, Liao Yumin, WANG Pu, Wang Xing, Yang Yifeng
Принадлежит:

A manufacturing method and a manufacturing apparatus for a printing magnetic orientation master and a magnetic pigment presswork are provided. The manufacturing method for a printing magnetic orientation master comprises: providing a magnet; using a heat radiation beam to heat a partial area of the magnet so that a new magnetic domain structure is formed in the partial area through self-magnetization of the magnet to change a magnetic-field distribution in the partial area; and removing the heat radiation beam to keep the new magnetic domain structure after it is decreased to a normal temperature so that the changed magnetic-field distribution is kept in the partial area, thus forming the printing magnetic orientation master having a predetermined magnetic orientation pattern. This can simplify the manufacturing process of the printing magnetic orientation master and allow the printing magnetic orientation master to carry abundant pattern information. 1. A manufacturing method for a printing magnetic orientation master , comprising:providing a magnet;using a heat radiation beam to heat a partial area of the magnet so that a new magnetic domain structure is formed in the partial area through self-magnetization of the magnet to change a magnetic-field distribution in the partial area; andremoving the heat radiation beam to keep the new magnetic domain structure after it is decreased to a normal temperature so that the changed magnetic-field distribution is kept in the partial area, thus forming the printing magnetic orientation master having a predetermined magnetic orientation pattern.2. The manufacturing method of claim 1 , further comprising:using a magnetic field to erase the predetermined magnetic orientation pattern of the printing magnetic orientation master to make the printing magnetic orientation master repeatedly rewritable.3. The manufacturing method of claim 2 , wherein the magnetic field is generated through electromagnetic induction or by a permanent ...

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Номер записи: 38
19-03-2015 дата публикации

IMAGING PROBE AND METHOD OF OBTAINING POSITION AND/OR ORIENTATION INFORMATION

Номер: US20150080710A1
Автор: DUNBAR Allan, Henkel Rolf, Ventura Sobrino Patino Eliseo, Von Offenberg Sweeney Robert
Принадлежит:

A method of obtaining information about the position and/or orientation of a magnetic component relatively to a magnetometric detector, the magnetic component and the magnetometric detector being moveable independently from each other relatively to a static secondary magnetic field, the method comprising the steps of: measuring in the presence of the combination of both the magnetic field of the magnetic component and the static secondary magnetic field essentially simultaneously the strength and/or orientation of a magnetic field at at least a first position and a second position spatially associated with the magnetometric detector, the second position being distanced from the first position; and combining the results of the measurements to computationally eliminate the effect of the secondary magnetic field and derive the information about the position and/or orientation of the magnetic component. 1. A method of obtaining information about the position and/or orientation of a magnetic component relative to a magnetometric detector , the magnetic component and the magnetometric detector being moveable independently from each other relative to a static secondary magnetic field , the method comprising the steps of:measuring in the presence of the combination of both the magnetic field of the magnetic component and the static secondary magnetic field essentially simultaneously the strength and/or orientation of a magnetic field at at least a first position and a second position spatially associated with the magnetometric detector, the second position being distanced from the first position; andcombining the results of the measurements to computationally eliminate the effect of the secondary magnetic field and derive the information about the position and/or orientation of the magnetic component.2. The method according to claim 1 , wherein the strength and/or orientation of a magnetic field as measured at at least one of the positions is used as a direct estimate of ...

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Номер записи: 39
24-03-2022 дата публикации

STRATEGIES TO PERFORM MAGNETIZATION REVERSALS IN FERROMAGNETS

Номер: US20220093306A1
Автор: Garg Anupam K., Ketterson John B., LIM Jinho, Zhang Zhaohui
Принадлежит:

Systems and methods for reversing a magnetization in a ferromagnet include a nanometer-scale cylindrical ferromagnetic sample having a height to diameter aspect ratio on the order of 2 or greater. A temporally-varying external field comprising an r.f. Pi pulse is applied to the ferromagnetic sample to cause a precession magnetization vector inclined at an angle with respect to the longest axis of the ferromagnetic sample to continuously rotate around the longest axis. One or more parameters of the temporally-varying external field is continuously adjusted based on at least magnetization dynamics of the ferromagnetic sample and/or an angular dependence of a precession frequency of the ferromagnetic sample. 1. A method for performing magnetization reversals in ferromagnets , the method comprising:providing a cylindrical ferromagnetic sample having a height dimension along a z-axis that is larger than a diameter dimension in an x-y plane that is perpendicular to the z-axis, the x-y plane defined by an x-axis that is perpendicular to the z-axis and a y-axis that is perpendicular to both the z-axis and the x-axis;applying a temporally-varying external field comprising a chirped r.f. Pi pulse to the ferromagnetic sample along a direction perpendicular to the z-axis in the x-y plane, an x-axis component and a y-axis component of the temporally-varying external field each having a magnitude that temporally varies according to a different function of time to cause the temporally-varying external field to continuously rotate a precession magnetization vector around the z-axis, the precession magnetization vector being inclined at an angle with respect to the z-axis; andsweeping a frequency of the chirped r.f. Pi pulse based on an instantaneous precession frequency and a corresponding angle of inclination of the precession magnetization vector.2. The method of claim 1 , further comprising applying a static non-zero external field to the ferromagnetic sample along a direction ...

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Номер записи: 40
23-03-2017 дата публикации

IMMUNITY FROM MAGNETIC DISTURBANCE FOR A MAGNETIC LOCATION TRACKER

Номер: US20170079547A1
Автор: Boumendil Alon, Gliner Vadim, Govari Assaf
Принадлежит: Biosense Webster (Israel) Ltd.

Apparatus, including a ferromagnetic sheet and at least one radiator, mounted in proximity to the ferromagnetic sheet and configured to radiate a magnetic field into a region in proximity thereto. The apparatus further includes a solid sheet of thermal insulation, mounted between the ferromagnetic sheet and the at least one radiator so as to prevent transfer of thermal energy from the at least one radiator to the ferromagnetic sheet. 1. Apparatus , comprising ,a ferromagnetic sheet;at least one radiator, mounted in proximity to the ferromagnetic sheet and configured to radiate a magnetic field into a region in proximity thereto; anda solid sheet of thermal insulation, mounted between the ferromagnetic sheet and the at least one radiator so as to prevent transfer of thermal energy from the at least one radiator to the ferromagnetic sheet.2. The apparatus according to claim 1 , wherein the solid sheet has a thermal conductivity of no more than 0.7 W·m·K.3. The apparatus according to claim 1 , wherein the solid sheet comprises wood.4. The apparatus according to claim 1 , wherein the solid sheet comprises a carbon fiber sheet.5. The apparatus according to claim 1 , wherein the ferromagnetic sheet comprises galvanized iron.6. The apparatus according to claim 1 , wherein the ferromagnetic sheet comprises a soft magnetic material having a coercivity less than 2 Oersted.7. The apparatus according to claim 1 , wherein the magnetic field causes the ferromagnetic sheet to operate in an unsaturated manner.8. The apparatus according to claim 1 , wherein the at least one radiator comprises a coil generating a magnetic image of the coil in the ferromagnetic sheet claim 1 , and wherein a distance between the ferromagnetic sheet and the at least one radiator is set so that the magnetic image radiates an image magnetic field having a distortion of less than 0.1% of the magnetic field.9. The apparatus according to claim 1 , wherein the solid sheet of thermal insulation comprises ...

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Номер записи: 41
23-03-2017 дата публикации

IMAGING PROBE AND METHOD OF OBTAINING POSITION AND/OR ORIENTATION INFORMATION

Номер: US20170079550A1
Автор: DUNBAR Allan, Henkel Rolf, Ventura Sobrino Patino Eliseo, Von Offenberg Sweeney Robert
Принадлежит: eZono AG

A method of obtaining information about the position and/or orientation of a magnetic component relatively to a magnetometric detector, the magnetic component and the magnetometric detector being moveable independently from each other relatively to a static secondary magnetic field, the method comprising the steps of: measuring in the presence of the combination of both the magnetic field of the magnetic component and the static secondary magnetic field essentially simultaneously the strength and/or orientation of a magnetic field at at least a first position and a second position spatially associated with the magnetometric detector, the second position being distanced from the first position; and combining the results of the measurements to computationally eliminate the effect of the secondary magnetic field and derive the information about the position and/or orientation of the magnetic component. 125-. (canceled)26. A medical device at least a portion which is insertable into the tissue of a patient , the medical device comprising a magnetic component that is integral with or removably attachable to the tissue-insertable portion of the medical device , wherein the magnetic component is a functional component of the medical device.27. The medical device according to claim 26 , wherein the magnetic component is integral with the remaining medical device.28. The medical device according to claim 26 , wherein the functioning of the medical device does not depend on the magnetic component being magnetic.29. The medical device according to claim 26 , wherein the magnetic moment of the magnetic component varies in at least one of magnitude and direction as a function of location on the magnetic component claim 26 , thereby creating a one-dimensional or more-dimensional magnetic pattern on the magnetic component.30. The medical device according to claim 26 , wherein the magnetic field of the magnetic component is not varying.31. The medical device according to claim 26 , ...

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Номер записи: 42
23-03-2017 дата публикации

External Air Core Flux Measurement System for a production magnetizing system

Номер: US20170082700A1
Автор: McMullen A. Todd
Принадлежит:

An external “Air Core” Flux Measurement System for a production magnetizing system/devices which is a an application of magnetic energies and the respective energies of a magnetizing coil and measurement system for the efficient production of coils for automotive and other industries and a system for evaluating the quality of the cores and magnetic charge after magnetization. This is an air core meter with gauges driven by a dedicated circuit. The present invention provides a method and apparatus for the testing of coils with an air core separate from the magnetization step to eliminate errors and other distracting signals inherent to the measurement device when combined with the core magnetizing step. 230. The external “Air Core” Flux Measurement System/device () according to wherein the set of various materials for flux measurement are selected from the group consisting of air with stiff coil wires claim 1 , plastic cores and ceramic coils.33032. The external “Air Core” Flux Measurement System/device () according to wherein the fixturing structure (A) made of durable materials is a set of various materials selected from the group consisting of non-ferromagnetic material stainless steel claim 1 , composite materials claim 1 , high strength and high temperature resistant plastic claim 1 , copper claim 1 , and bronze.43038. The external “Air Core” Flux Measurement System/device () according to wherein the power source () for the magnetizing flux gauge is selected from the group consisting of high (240 v plus) voltage AC claim 1 , Low voltage AC (<240 V) AC or DC voltage.530. The external “Air Core” Flux Measurement System/device () wherein the set of several quality tests are selected from the group consisting of Defect detection; Motor Back EMF; Flux Measurement Capability; Gage R&R; reluctance R (resistance losses); and Variation Analysis (VSA).6. The external “Air Core” Flux Measurement System/device which uses a process comprised of:{'b': 51', '53, 'Step 1—the ...

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Номер записи: 43
23-03-2017 дата публикации

Multiple step shifted-magnetizing method to improve performance of multi-pole array magnet

Номер: US20170084389A1
Автор: Amy Qian, Hao Zhu, Richard D. Kosoglow, Sean S. Corbin
Принадлежит: Apple Inc

An efficient magnetic assembly having magnetic regions is formed by applying a magnetic field from a magnetizer to predefined portions of a monolithic substrate corresponding to the magnetized regions. In the described embodiment, the magnetic field is of sufficient strength and is applied for a sufficient amount of time to magnetize the corresponding portions of the monolithic substrate. A distance between at least two adjacent magnetized regions corresponding to a neutral zone is determined and based upon the determination, the monolithic substrate is shifted an amount less than the distance corresponding to the neutral zone and the magnetic field is re-applied to at least the shifted portion of the monolithic substrate.

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Номер записи: 44
02-04-2015 дата публикации

MULTI-POLE MAGNETIZATION OF A MAGNET

Номер: US20150091680A1
Автор: Gery Jean-Marc
Принадлежит: Apple Inc.

A method of magnetizing a multi-pole magnet includes the steps of obtaining a magnetization coil having a magnetization zone and a central axis, and positioning a magnet within the magnetization zone. The method also includes positioning at least one pair of shield bodies including a conductive material proximate the first and second surfaces of the magnet, with the shield bodies being aligned together to cover both sides of at least a first region of magnet and expose both sides of at least a second region of the magnet. The method further includes energizing the magnetization coil to generate an applied magnetic field within the magnetization zone that is sufficient to induce eddy currents in the at least one pair of shield bodies and to magnetize the exposed second region of the magnet. 1. A method for forming a multi-pole magnet using a magnetization coil having a magnetization zone and a central axis and configured to generate a magnetic field within the magnetization zone having flux lines that are substantially parallel to the central axis , the method comprising:using a shield body to magnetically shield a portion of a magnet located within the magnetization zone, the shield body being formed from a conductive material and with a thickness sufficient to allow for the inducement of eddy currents in accordance with the magnetic field; andusing the magnetization coil to generate the magnetic field within the magnetization zone, the magnetic field having a field strength sufficient to magnetize an unshielded portion of the magnet and to induce eddy currents in the shield body that prevent magnetization of the shielded portion of the magnet.2. The method of claim 1 , wherein using the magnetization coil further comprises energizing the magnetization coil using a plurality of electrical pulses in a sequence that causes the magnetization coil to generate a shifting magnetic field that induces the eddy currents in the shield body.3. The method of claim 2 , wherein ...

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Номер записи: 45
02-04-2015 дата публикации

DEMAGNETIZING APPARATUS, DRAWING APPARATUS, AND METHOD OF MANUFACTURING ARTICLE

Номер: US20150093705A1
Автор: Uchida Shinji
Принадлежит:

The present invention provides a demagnetizing apparatus for demagnetization of an object, comprising a coil configured to generate a magnetic field for demagnetizing the object, and a supply device configured to supply, to the coil, an alternating current whose amplitude decreases with time, wherein the supply device supplies the alternating current to the coil such that an amplitude of the alternating current is larger than an absolute value of a current value at which magnetic saturation is occurred in the object in a first period, an absolute value of a rate of change in amplitude of the alternating current is larger than that in the first period in a second period, and an amplitude of the alternating current is smaller than an absolute value of a current value corresponding to a coercive force of the object in a third period. 1. A demagnetizing apparatus for demagnetization of an object , the apparatus comprising:a coil configured to generate a magnetic field for demagnetizing the object; anda supply device configured to supply, to the coil, an alternating current whose amplitude decreases with time,wherein the supply device is configured to supply the alternating current to the coil such that in a first period, an amplitude of the alternating current is larger than an absolute value of a current value at which magnetic saturation is occurred in the object, in a second period after the first period, an absolute value of a rate of change in amplitude of the alternating current is larger than that in the first period, and in a third period after the second period, an amplitude of the alternating current is smaller than an absolute value of a current value corresponding to a coercive force of the object, and an absolute value of a rate of change in amplitude of the alternating current is smaller than that in the second period.2. The apparatus according to claim 1 , wherein the supply device is configured to supply the alternating current for at least two cycles ...

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Номер записи: 46
30-03-2017 дата публикации

Machine learning system and magnetizer for motor

Номер: US20170090432A1
Автор: Makoto FUNAKUBO
Принадлежит: FANUC Corp

A machine learning system according to an embodiment of the present invention includes a state observer for observing the winding temperature, winding resistance, current value, and rotor magnetic flux density of a magnetization unit having a magnetizing yoke and windings; a reward calculator for calculating a reward from the rotor magnetic flux density obtained by the state observer; and a learning unit for updating an action value table based on a magnetization rate calculated from the rotor magnetic flux density and a target magnetic flux density, the winding temperature, and the winding resistance.

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Номер записи: 47
05-05-2022 дата публикации

Composite Permanent Magnet

Номер: US20220139603A1
Автор: Gao Kaizhong
Принадлежит:

A hard disk drive includes composite magnet as voice coil motor magnet, where a composite permanent magnet comprising: a first magnet (M1), a second magnet (M2) and a third magnet (M3). M1, M2 and M3 are deposited, bonded, sintered, glued or assembled together and next to each other. The directions of the saturation magnetization of M1 and M3 are opposite to each other. The direction of the saturation magnetization of M2 is substantially perpendicular to the direction of saturation magnetization of M1 and M3.

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Номер записи: 48
30-03-2017 дата публикации

ADDITIVE MANUFACTURING OF MAGNETS

Номер: US20170092400A1
Автор: Bharadwaj Shravan
Принадлежит:

A unibody magnetic structure having layers of variably magnetized material is disclosed. The unibody magnetic structure can be formed by way of additive manufacturing, such as by a stereolithographic (SLA) process or a selective laser sintering (SLS) process. The SLA process can involve forming the structure from a molten pool of polymer material, with the material having a magnetic component dissolved therein. The SLS process can involve sintering the structure from a powder having a magnetic component. As each layer is formed, the layer can be selectively magnetized with a given polarity and strength. The magnetization of each formed layer can vary, such that the final structure comprises numerous layers having different shapes and sizes, as well as different levels and polarities of magnetization. 1. A method of manufacturing a magnetized structure , comprising:forming a layer of magnetic material using a forming magnetic field having a forming magnetic field property and having magnetic field lines aligned generally along a longitudinal axis; andmagnetizing the layer of magnetic material using a magnetizing magnetic field having a magnetizing magnetic field property and having magnetic field lines aligned generally orthogonal to the longitudinal axis.2. The method as recited in claim 1 , wherein the magnetized layer of magnetic material is characterized as having a magnetic layer property.3. The method as recited in claim 2 , wherein the magnetic layer property corresponds to a superposition of the forming magnetic field property and the magnetizing magnetic field property.4. The method as recited in claim 3 , wherein the layer of magnetic material is a first layer of magnetic material and wherein the magnetized layer is a first magnetized layer characterized as having a first magnetic layer property and further comprising:forming a second layer of magnetic material using the forming magnetic field, wherein the second layer of magnetic material abuts the first ...

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Номер записи: 49
28-03-2019 дата публикации

DEVICE FOR DEMAGNETIZING ELONGATED COMPONENTS AND METHOD FOR DEMAGNETIZING SUCH COMPONENTS

Номер: US20190096559A1
Автор: Maurer Albert, MEYER Urs B.
Принадлежит:

A device for demagnetizing a ferromagnetic, elongated component of any length having a uniform profile which has an accessible surface on one side along its length. The device comprises a rod-shaped, ferromagnetic core having a circumferential shell surface, which is closed off by a front end face and a rear end face. At least one coil is wrapped around the shell surface, with the coil connected to a current source which can generate an alternating current, whereby a magnetic alternating flux is induced in the ferromagnetic core, the flux entering and exiting at the two end faces. A coil is wrapped around the shell surface, with the coil connected to a current source which can generate a direct current to superimpose the magnetic alternating flux with a thereby induced magnetic unidirectional flux through the ferromagnetic core, the flux entering and exiting at the two end faces. 1. A device for demagnetizing a ferromagnetic , elongated component of any length having a uniform profile having a longitudinal axis which has an accessible surface on one side along its length , wherein the device comprises a rod-shaped , ferromagnetic core having a circumferential shell surface which is closed off by a front end face and a rear end face , wherein these end faces are aligned facing away from each other and wherein at least one coil is wrapped around the shell surface , which coil is connected at its ends to a current source which can generate an alternating current , whereby a magnetic alternating flux is induced in the ferromagnetic core , which flux enters and exits at the two end faces and in the non-coiled region of the shell surface , wherein a coil is wrapped around the shell surface of the ferromagnetic core , which coil is connected at its ends to a current source which can generate a direct current for superimposing the magnetic alternating flux with a thereby induced magnetic unidirectional flux through the ferromagnetic core , which enters and exits at the two ...

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Номер записи: 50
21-04-2016 дата публикации

METHOD FOR MANUFACTURING AN INTERIOR PERMANENT MAGNET ROTOR UNIT AND MAGNETIZING DEVICE

Номер: US20160111945A1
Автор: KANDA Naotake, OONO Yoshihiro, Shibata Yoshiyuki, YAMAGUCHI Ryosuke
Принадлежит: JTEKT CORPORATION

A radial magnetizing part including permanent magnets is disposed so as to face a rotor unit in a radial direction of the rotor unit. Axial magnetizing parts are disposed on both end faces in an axial direction of the rotor unit. The axial magnetizing parts include low magnetic permeability portions and high magnetic permeability portions. The low magnetic permeability portions are disposed so as to face magnet materials. Magnetic flux from the N pole of the permanent magnet of the radial magnetizing part enters a core in the radial direction, crosses the magnet material, and returns to the S pole of the permanent magnet. The magnetic flux from the N pole of the permanent magnet of the radial magnetizing part also enters the core through the high magnetic permeability portions of the axial magnetizing parts, crosses the magnet material, and returns to the S pole of the permanent magnet. 1. A method for manufacturing an interior permanent magnet rotor unit , comprising:magnetizing a magnet material filling a core of the rotor unit by using a magnetizing device to produce a permanent magnet, wherein,the rotor unit includes a plurality of the permanent magnets embedded in the core, a rotor is formed by the single rotor unit or by coupling a plurality of the rotor units in an axial direction, and the rotor is a component of an interior permanent magnet synchronous motor, wherein,the magnetizing device includes a radial magnetizing part that faces the core in a radial direction of the core, and an axial magnetizing part that faces the core in the axial direction of the core,a first magnetizing part, which is one of the radial magnetizing part and the axial magnetizing part, is a source of a magnetic field and is disposed in the magnetizing so that the radial magnetizing part faces the axial magnetizing part in the radial direction of the core or that the axial magnetizing part faces the radial magnetizing part in the axial direction of the core,in the magnetizing, the ...

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Номер записи: 51
30-04-2015 дата публикации

MAGNETIC MEDIUM FOR MAGNETIC ENCODER, MAGNETIC ENCODER AND METHOD FOR MANUFACTURING MAGNETIC MEDIUM

Номер: US20150115939A1
Автор: Abe Yasunori, Kawakami Makoto
Принадлежит: HITACHI METALS, LTD.

The present disclosure provides a magnetic medium, a magnetic encoder, and a method for manufacturing a magnetic medium with high reliability that can obtain the sufficient signal output, while reducing the hysteresis error. 1. A magnetic medium relatively movable with respect to a magnetic sensor for detecting a magnetic field in a magnetosensitive face , the magnetic medium comprising:a signal magnetization region including a first magnetization region magnetized in a first direction being in parallel with the magnetosensitive face and a second magnetization region magnetized in a second direction opposed to the first direction, the first magnetization region and the second magnetization region being alternately arranged along the first direction or the second direction; anda bias magnetization region magnetized in a third direction, the third direction intersecting both the first and second directions, and being in parallel with the magnetosensitive face, whereinwhile a surface of the magnetic medium opposed to the magnetic sensor is placed to face upward,the bias magnetization region is formed under the first magnetization region and the second magnetization region near an interface between the first magnetization region and the second magnetization region, and no bias magnetization regions are formed under the first magnetization region near a center of the first magnetization region and under the second magnetization region near a center of the second magnetization region.2. The magnetic medium according to claim 1 , wherein both the signal magnetization region and the bias magnetization region are not magnetized up to a lower surface of the magnetic medium.3. The magnetic medium according to claim 1 , wherein maximum magnetization depth of the signal magnetization region is deeper than a maximum magnetization depth of the bias magnetization region.4. A magnetic encoder claim 1 , comprising:a magnetic sensor including a magnetoresistive effect element ...

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Номер записи: 52
26-04-2018 дата публикации

RARE-EARTH MAGNET AND LINEAR MOTOR USING SAME

Номер: US20180114620A1
Автор: FUJIHARA Makoto, FUJIKAWA Kenichi, Hoshino Toshinobu, SAITO Shoichiro
Принадлежит:

Provided are a rare-earth magnet capable of realizing a high magnetic flux amount without using any back yoke, and a linear motor comprising a movable element using the rare-earth permanent magnet. A rare-earth permanent magnet-forming sintered body for forming a permanent magnet is integrally sintered while being formed into a given three-dimensional shape with a lengthwise cross-section having a first surface extending in a length direction thereof, a second surface lying at a distance from the first surface in a thickness direction thereof and extending in the length direction, and an edge surface of each of lengthwise opposite ends thereof. This sintered body is formed such that easy magnetization axes of the magnet material particles included in a central region thereof are oriented in such a manner as to be directed along an arch-shaped path. 1. A rare-earth permanent magnet-forming sintered body comprising magnet material particles containing a rare-earth substance , wherein the magnet material particles are integrally sintered while being formed into a given three-dimensional shape with a lengthwise cross-section having a first surface extending in a length direction thereof , a second surface lying at a distance from the first surface in a thickness direction thereof and extending in the length direction , and an edge surface of each of lengthwise opposite ends thereof , wherein:in a central region of the sintered body located between a first end region and a second end region on the respective sides of the opposite ends, when viewed in the length direction, easy magnetization axes of the magnet material particles included in the central region are oriented in such a manner as to be directed along a path which enters an inside of the sintered body from the second surface at a position located on the side of the first end region with respect to a lengthwise center line of the central region passing through a lengthwise center of the central region and ...

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Номер записи: 53
26-04-2018 дата публикации

Electromagnet device, electromagnet controller, electromagnet control method, and electromagnet system

Номер: US20180114678A1
Автор: Hironobu Yamasaki, Ichiju SATO, Misako KUDO, Tomonori Ohashi, Toshimitsu Barada
Принадлежит: Ebara Corp

The electromagnet device of the present invention comprises: a yoke having an annular groove in a front surface thereof; an annular coil provided in the groove; and an epoxy resin provided on an outer surface of the coil configured to secure the coil to the yoke, wherein there is a clearance between an outer circumferential surface of the groove in the yoke and the epoxy resin provided on an radially outer side of the coil.

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Номер записи: 54
09-06-2022 дата публикации

MAGNETIC FIELD SUPPRESSION SYSTEM

Номер: US20220181062A1
Автор: KORDUNSKY Igor
Принадлежит:

Apparatus and methods to reduce unwanted magnetic fields and unwanted motion in precision instruments are described. A coil assembly that is used to generate an opposing magnetic field can include a first coil configured to generate a static magnetic field and a second coil configured to generate a time-varying magnetic field. The first and second coils can be in close proximity and sized to suppress magnetic fields over a large localized region. The first coil can be connected to a choke to increase its impedance seen by the second coil. 1. A magnetic field suppression system comprising:a first coil assembly having a first winding configured to generate a static magnetic field along a first direction through a center of the first coil assembly; anda second winding configured to generate a time-varying magnetic field along essentially the same direction.2. The magnetic field suppression system of claim 1 , further comprising a choke connected to the first winding.3. The magnetic field suppression system of claim 2 , wherein the choke is connected as a common mode choke.4. The magnetic field suppression system of claim 1 , wherein the first winding is located within 8 cm from the second winding.5. The magnetic field suppression system of claim 1 , wherein a maximum amount of current provided to the first winding by the magnetic field suppression system is greater than a maximum amount of current provided to the second winding.6. The magnetic field suppression system of claim 1 , wherein a minimum span of the first coil assembly is between 0.25 m and 10 m.7. The magnetic field suppression system of claim 1 , further comprising:DC control circuitry connected to the first winding and configured to provide a DC or slowly varying current having cyclic variations of 1 Hz or less to the first winding; andAC control circuitry connected to the second winding and configured to provide at least a time-varying current having cyclic variations greater than 1 Hz to the second ...

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Номер записи: 55
24-07-2014 дата публикации

ELECTRO PERMANENT MAGNETIC SYSTEM WITH MAGNETIC STATE INDICATOR

Номер: US20140202374A1
Автор: Cipolla Matteo, Filosa Giuseppe, Messinella Daniele, Obori Daniele, Parolari Andrea, Premoli Albino
Принадлежит:

An electro permanent magnetic system () for anchoring ferromagnetic material, with magnetic state indicator (), comprising: an electro permanent magnetic module (), a control unit () for said electro permanent magnetic module (), an electrical connection system () between said control unit () and said electro permanent magnetic module (); a magnetization indicator () for said electro permanent magnetic module () associated with the electro permanent magnetic module (); characterised in that said magnetization indicator () is a bistable indicator having two stable states; said magnetization indicator () not requiring electrical power to remain in one of said stable states; said magnetization indicator () being electrically fed only in association with the magnetization or demagnetization of said electro permanent magnetic module (), to pass from one stable state to the other of said two stable states. 1101412111213111214121214141412. An electro permanent magnetic system () for anchoring ferromagnetic material , with magnetic state indicator () , comprising: an electro permanent magnetic module () , a control unit () for said electro permanent magnetic module () , an electrical connection system () between said control unit () and said electro permanent magnetic module (); a magnetization indicator () for said electro permanent magnetic module () associated with the electro permanent magnetic module (); characterised in that said magnetization indicator () is a bistable indicator having two stable states; said magnetization indicator () not requiring electrical power to remain in one of said stable states; said magnetization indicator () being electrically powered only in association with the magnetization or demagnetization of said electro permanent magnetic module () , to pass from one stable state to the other of said two stable states.21412. A system as claimed in claim 1 , characterised in that said magnetization indicator () is positioned rigid with said electro ...

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Номер записи: 56
05-05-2016 дата публикации

METHOD AND APPARATUS FOR NON-CONTACT AXIAL PARTICLE ROTATION AND DECOUPLED PARTICLE PROPULSION

Номер: US20160125994A1
Автор: MAIR Lamar Odell, Nacev Aleksandar Nelson, WEINBERG Irving N.
Принадлежит:

An apparatus and method for magnetic particle manipulation enables the particle to be rotated and translated independently using magnetic fields and field gradients, which produce the desired decoupled translational and rotational motion. The apparatus and the method for manipulation may be implemented in parallel, involving many particles. The rotational magnetic field used to induce rotational motion may be varied to induce particle motion, which is either in phase or out of phase with the rotational magnetic field. The magnetic fields and gradients described herein may be generated with permanent magnets, electromagnets, or some combination of permanent magnets and electromagnets. 1. An apparatus for rotating and translating at least one particle , the apparatus comprising:means for generating magnetic force and torque; andat least one particle, wherein at least some portion of the at least one particle contains a magnetizable material,wherein the generated magnetic force is applied to at least some portion of the at least one particle to cause translational motion of the particle, 'wherein the ratio of the translational and rotational velocities of the particle is variable.', 'wherein the generated magnetic torque is applied to at least some other portion of the same at least one particle to cause rotation of the particle, and'}2. The apparatus of claim 1 , wherein the particle is introduced in a body claim 1 , and a ratio of the translational and rotational velocities of the particle is varied while the particle is in the body.3. The apparatus of claim 1 , wherein the means for generating magnetic force includes means for generating a rotational field ranging from 1 Hz to 1000 Hz.4. The apparatus of claim 1 , wherein the at least one particle is composed of polymeric claim 1 , metallic claim 1 , insulating claim 1 , semiconducting claim 1 , ceramic claim 1 , or combinations of at least two of these materials.5. The apparatus of claim 1 , wherein the at least ...

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Номер записи: 57
14-05-2015 дата публикации

Magnetization Apparatus for Magnet of Magnetic Encoder and Method Thereof

Номер: US20150130571A1
Автор: TOMIOKA Masanori
Принадлежит:

A magnetization apparatus for a magnet of a magnetic encoder. The magnetization apparatus is configured to alternately form a positive and a negative magnetization areas by moving a magnetic member along a route penetrating a gap of a magnetization yoke while alternately generating positive and negative magnetic fields in the gap of the magnetization yoke. The magnetization apparatus includes a power supply part configured to supply electric power to a coil wound around the magnetization yoke; an area setting part configured to receive magnetization pattern information specifying arrangement of the magnetization areas relative to the magnetic member; a positional information generation part configured to output positional information of the magnetic member moving along the route; and a control part configured to control the power supply part in such a manner that each portion of the magnetic member corresponding to the magnetization area specified in the magnetization pattern information receives corresponding positive or negative magnetic field based on the positional information outputted from the positional information generation part. 1. A magnetization apparatus for a magnet of a magnetic encoder , the magnetization apparatus being configured to alternately form a positive and a negative magnetization areas by moving a magnetic member along a route penetrating a gap of a magnetization yoke while alternately generating positive and negative magnetic fields in the gap of the magnetization yoke , the magnetization apparatus comprising:a power supply part configured to supply electric power to a coil wound around the magnetization yoke;an area setting part configured to receive magnetization pattern information specifying arrangement of the magnetization areas relative to the magnetic member;a positional information generation part configured to output positional information of the magnetic member moving along the route; anda control part configured to control the ...

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Номер записи: 58
31-07-2014 дата публикации

SYSTEM AND METHOD FOR PRODUCING MAGNETIC STRUCTURES

Номер: US20140211360A1
Автор: Fullerton Larry W., Roberts Mark D., Straus Stephen D.
Принадлежит: Correlated Magnetics Research, LLC

A magnetizer for magnetizing magnetic field sources into a magnetizable material includes a magnetization subsystem, a motion control system, and a magnetizer control system. The magnetization subsystem includes a magnetizing inductor comprising a plurality of flat conductor layers and a plurality of insulating layers that form multiple turns of a coil having an aperture and a magnetization circuitry for applying a current to the magnetizing inductor to generate a magnetizing field having a high magnetic flux density in and near said aperture that is sufficient to magnetize said magnetizable material and having a low magnetic flux density elsewhere that is insufficient to substantially magnetize said magnetizable material. The motion control system moves at least one of the magnetizable material or the magnetizing inductor to position the aperture of the magnetizing inductor adjacent to one or more locations at a surface of the magnetizable material where the one or more magnetic field sources are magnetized into the magnetizable material. The one or more magnetic field sources have a first polarity exposed at the surface of the magnetizable material and a second polarity not exposed at the surface of the magnetizable material. 1. A magnetizer for magnetizing one or more magnetic field sources into a magnetizable material , comprising: [ a plurality of flat conductor layers; and', 'a plurality of insulating layers, said plurality of flat conductor layers and said plurality of insulating layers forming multiple turns of a coil, said magnetizing inductor having an aperture extending through said plurality of flat conductive material layers; and, 'a magnetizing inductor, comprising, 'a magnetization circuitry for applying a current to said magnetizing inductor to generate a magnetizing field having a high magnetic flux density in and near said aperture that is sufficient to magnetize said magnetizable material and having a low magnetic flux density elsewhere that is ...

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Номер записи: 59
21-05-2015 дата публикации

System and Method for Producing Magnetic Structures

Номер: US20150137919A1
Автор: Fullerton Larry W., Roberts Mark D.
Принадлежит: Correlated Magnetics Research, LLC

A system for producing magnetic structures includes multiple magnetizing circuits and multiple inductor coils used to magnetically print multiple magnetic sources onto multiple pieces of magnetizable material moving on a motion control system. The multiple inductor coils may be configured on one or more gantries. The motion control system may be a conveyor system. 1. A magnetic printing system , comprising:a print head for producing a magnetizing field that magnetically prints a maxel at a desired location on a magnetizable material positioned adjacent to a first side of said print head, said print head comprising an inductor coil having a plurality of layers of a flat conductor that produce a plurality of inductive turns about an aperture; anda magnetic shielding layer between said print head and said magnetizable material.2. The magnetic printing system of claim 1 , wherein said magnetic shielding layer is configured to shield the magnetizable material from magnetizing fields at locations other than at said desired location.3. The magnetic printing system of claim 1 , wherein said magnetic shielding layer comprises a hole that corresponds to said aperture.4. The magnetic printing system of claim 3 , wherein said magnetic shielding layer has a slot extending from said hole to the perimeter of said magnetic shielding layer.5. The magnetic printing system of claim 3 , wherein said hole is larger in size than said aperture.6. The magnetic printing system of claim 3 , wherein said hole is smaller than or equal in size than said aperture.7. The magnetic printing system of claim 3 , wherein the thickness of the magnetic shielding layer increases from the hole to its outer boundary.8. The magnetic printing system of claim 1 , wherein an outer diameter of said magnetic shielding layer is greater than an outer diameter of said print head.9. The magnetic printing system of claim 1 , wherein an outer diameter of said magnetic shielding layer is less than or equal to an outer ...

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Номер записи: 60
23-04-2020 дата публикации

DEVICE FOR EVALUATING AND DEMAGNETIZING RESIDUAL MAGNETISM QUANTITY OF POWER TRANSFORMER AND CONTROL METHOD THEREOF

Номер: US20200126706A1
Автор: Chen Shu, DENG Jieqing, Li Jiansheng, LI Ruibin, LIAO Caibo, Liu Yang, LU Yuncai, TAO Fengbo, WANG SHENGQUAN, Wei Chao, WEI Hairong, Wei Xu, Wu Peng, Wu Yiming, XIE Tianxi, Yang Xiaoping
Принадлежит:

The present invention discloses a device for evaluating and demagnetizing residual magnetism quantity of a power transformer. A main circuit comprises a switching power supply the two ends of which are respectively connected with a filter capacitor and a resistor in parallel. A forward end of the switching power supply is connected with a main switch in series. A rear end of the main switch is connected with a series branch of a sixth switch and a first resistor, a series branch of a first switch and a second switch, and a series branch of a third switch and a fourth switch are connected in parallel. A driving circuit is respectively connected with driving ends of the main switch, the sixth, first, second, third and fourth switches. A control circuit is connected with the driving circuit for sending an instruction to the driving circuit. 1. A device for evaluating and demagnetizing residual magnetism quantity of a power transformer , comprising a main circuit , a control circuit and a driving circuit , wherein the main circuit comprises a switching power supply the two ends of which are respectively connected with a filter capacitor and a resistor in parallel , a forward end of the switching power supply is connected with a main switch in series , and a rear end of the main switch is connected with a series branch of a sixth switch and a first resistor , a series branch of a first switch and a second switch , and a series branch of a third switch and a fourth switch in parallel; and the driving circuit is respectively connected with driving ends of the main switch , the sixth switch , the first switch , the second switch , the third switch and the fourth switch , and the control circuit is connected with the driving circuit for sending an instruction to the driving circuit.2. The device for evaluating and demagnetizing residual magnetism quantity of a power transformer according to claim 1 , wherein the rear end of the main switch is also connected with a series ...

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Номер записи: 61
03-06-2021 дата публикации

Vibration and noise reduction motor, rotor magnetizing structure of motor, and skew magnetizing yoke

Номер: US20210167647A1
Автор: Hyojin KO, Hyoung Uk Nam, Jun Young Song
Принадлежит: LG ELECTRONICS INC

A vibration and noise reduction motor, a rotor magnetizing structure of a motor, and a skew magnetizing yoke. The vibration and noise reduction motor includes a stator that is concentric with a shaft and axially fixed and a rotor including a rotor core configured to surround the stator and a plurality of block magnets disposed in the rotor core and configured to face the stator and surround the stator, where an air gap is provided between the plurality of block magnets and the stator, and each piece of the plurality of block magnets includes a plurality of poles and the plurality of block magnets are magnetized by a skew magnetizing yoke and has a continuous skew shape such that the plurality of poles provided for each piece are each inclined by a skew angle of the skew magnetizing yoke.

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Номер записи: 62
17-05-2018 дата публикации

MAGNETIZING DEVICE FOR MAGNETIC ENCODER

Номер: US20180137962A1
Автор: Takahashi Toru, Ueno Shintarou
Принадлежит: NTN CORPORATION

A magnetizing device includes a magnetization yoke including a pair of magnetization heads confronting each other through a magnetic gap, an excitation coil wound around the magnetization yoke, and a magnetization power supply that supplies a magnetizing current to the excitation coil to generate magnetic flux between the magnetization heads. A magnetic shield is provided on the magnetization yoke. The magnetic shield is spaced apart from one of the magnetization heads with a gap being formed therebetween along a direction in which the plurality of magnetic encoder tracks are arranged. The magnetic shield blocks a flow of magnetic flux that is present outside a defined extension of a flow of the magnetic flux between the pair of magnetization heads. The magnetic shield is of such a geometry that a thickness thereof progressively decreases towards the one of the magnetization heads. 1. A magnetizing device for a magnetic encoder operable to magnetize an annular magnetic body that integrally has a plurality of unmagnetized annular magnetic encoder tracks arranged so as to adjoin each other , by causing the annular magnetic body to rotate to magnetize circumferential portions of the annular magnetic body one at a time , thereby producing a magnetic encoder with the magnetic encoder tracks , which have respective magnetic patterns formed thereon that are different from each other , a magnetization yoke including a pair of magnetization heads magnetically confronting each other through a magnetic gap, the magnetization yoke being configured to magnetize a magnetic encoder track of the magnetic encoder, the magnetic encoder track being arranged in a defined location and position relative to the magnetization heads;', 'an excitation coil wound around the magnetization yoke;', 'a magnetization power supply configured to supply a magnetizing current to the excitation coil to generate magnetic flux between the pair of magnetization heads; and', 'a magnetic shield provided on ...

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Номер записи: 63
14-08-2014 дата публикации

Remotely addressable magnetic composite micro-actuators

Номер: US20140225694A1
Автор: Eric Diller, Metin Sitti, Shuhei Miyashita
Принадлежит: CARNEGIE MELLON UNIVERSITY

The present invention describes methods to fabricate actuators that can be remotely controlled in an addressable manner, and methods to provide remote control such micro-actuators. The actuators are composites of two permanent magnet materials, one of which is has high coercivity, and the other of which switches magnetization direction by applied fields. By switching the second material's magnetization direction, the two magnets either work together or cancel each other, resulting in distinct “on” and “off” behavior of the devices. The device can be switched “on” or “off” remotely using a field pulse of short duration.

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Номер записи: 64
08-09-2022 дата публикации

MAGNETISM BOOSTER ASSEMBLY

Номер: US20220285061A1
Автор: Wechselberger Marcus, Zimmermann Michael J.
Принадлежит:

A magnetism booster assembly includes a body having a first end and a second end. The body defines a bore and a cavity formed separately from the bore. The bore extends between the first end and the second end. The cavity has a first opening adjacent the first end of the body and a second opening adjacent the second end of the body. The magnetism booster assembly also includes a magnet positioned within the cavity. 1. A magnetism booster assembly comprising:a body having a first end and a second end, the body defining a bore and a cavity formed separately from the bore, the bore extending between the first end and the second end, the cavity having a first opening adjacent the first end of the body and a second opening adjacent the second end of the body; anda magnet positioned within the cavity.2. The magnetism booster assembly of claim 1 , wherein the cavity is partially defined by a back surface of the body claim 1 , and wherein the second opening is adjacent the back surface.3. The magnetism booster assembly of claim 1 , wherein the body includes a protrusion extending into the bore claim 1 , and wherein the protrusion is configured to engage a shaft of a tool.4. The magnetism booster assembly of claim 1 , wherein the cavity is a first cavity and the magnet is a first magnet claim 1 , wherein the body further defines a second cavity formed separately from the bore and the first cavity claim 1 , wherein the second cavity has a third opening adjacent the first end of the body and a fourth opening adjacent the second end of the body claim 1 , and the magnetism booster assembly further comprising a second magnet positioned within the second cavity.5. The magnetism booster assembly of claim 4 , wherein the first cavity and the second cavity are positioned on diametrically opposite sides of the bore.6. The magnetism booster assembly of claim 1 , wherein the body is generally circular claim 1 , and wherein the cavity has a generally rectangular cross-section.7. The ...

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Номер записи: 65
30-04-2020 дата публикации

Magnetic fastening assembly

Номер: US20200135372A1
Автор: Aseem Singla
Принадлежит: Microsoft Technology Licensing LLC

A fastening assembly is provided that includes a first permanent magnet having a first operating temperature and a second permanent magnet having a second operating temperature lower than the first operating temperature. The first permanent magnet is attachable to the second permanent magnet in a locked state at a first temperature lower than the second operating temperature. The first permanent magnet is releasable from the second permanent magnet in an unlocked state at a second temperature that is higher than the second operating temperature.

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Номер записи: 66
09-05-2019 дата публикации

ELECTRIC TOOTHBRUSH AND ITS DRIVE MOTOR

Номер: US20190140533A1
Автор: Hu Feifan, HU Feiran, Hu Jianchang, Hu Jiankun
Принадлежит:

Provided are an electric toothbrush and its drive motor, which comprises a U-shaped magnetic yoke, a rotary output component, a second magnetic yoke and four permanent magnets. The two support legs of the U-shaped yoke are respectively wound with coils, enabling the two leg end faces to generate alternating magnetic poles under the control of circuit. The four magnets are centrosymmetrically disposed about a rotatory central line, the first and the fourth magnet are of the same polarity, the second and the third magnet are of the same polarity; the first and the second magnet are of the opposite polarity, disposed corresponding to the first leg; the third and the fourth magnet are of the opposite polarity, disposed corresponding to the second leg. Under the control of circuit, the driving permanent magnets drive the second yoke and the rotary output component to reciprocatively rotate about the rotatory central line. 1. A drive motor for electric toothbrush , comprising:a U-shaped magnetic yoke, the U-shaped magnetic yoke has a first support leg and a second support leg, and the first support leg and the second support leg are respectively wound with coils;a control circuit, the control circuit is electrically connected to the coils and generates alternating pulses, to generate alternating magnetic poles at the end faces of the two support legs of the U-shaped magnetic yoke;a rotary output component, the rotary output component can reciprocatively rotate about a rotatory central line;a second magnetic yoke, the second magnetic yoke is disposed at one end of the rotary output component near the U-shaped magnetic yoke; andfour permanent magnets, the permanent magnets are fixedly mounted on the second yoke; the four permanent magnets are centrosymmetrically disposed about a rotatory central line, they are a first permanent magnet, a second permanent magnet, a third permanent magnet and a fourth permanent magnet; the outer faces of the first permanent magnet and the ...

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Номер записи: 67
01-06-2017 дата публикации

Method for Producing Magnet of Magnetic Encoder

Номер: US20170154717A1
Автор: TOMIOKA Masanori
Принадлежит:

A magnetization apparatus for a magnet of a magnetic encoder. The magnetization apparatus is configured to alternately form a positive and a negative magnetization areas by moving a magnetic member along a route penetrating a gap of a magnetization yoke while alternately generating positive and negative magnetic fields in the gap of the magnetization yoke. The magnetization apparatus includes a power supply part configured to supply electric power to a coil wound around the magnetization yoke; an area setting part configured to receive magnetization pattern information specifying arrangement of the magnetization areas relative to the magnetic member; a positional information generation part configured to output positional information of the magnetic member moving along the route; and a control part configured to control the power supply part in such a manner that each portion of the magnetic member corresponding to the magnetization area specified in the magnetization pattern information receives corresponding positive or negative magnetic field based on the positional information outputted from the positional information generation part. 18-. (canceled)9. A method for producing a magnet of a magnetic encoder , magnetization areas being formed by moving a magnetic member along a route penetrating a gap of a magnetization yoke while generating a positive and a negative magnetic fields in the gap of the magnetization yoke , the method comprising steps of:receiving in advance magnetization pattern information that respectively specifies arrangement of the magnetization areas relative to the magnetic member, widths of the magnetization areas being defined in the magnetization pattern information;determining in real time a position of the magnetic member moving along the route; andsupplying electric power to a coil wounded around the magnetization yoke in such a manner that each portion of the magnetic member corresponding to each magnetization area specified in the ...

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Номер записи: 68
17-06-2021 дата публикации

AXISYMMETRIC ELECTROPERMANENT MAGNETS

Номер: US20210183553A1
Автор: Arnold David P., Velez Cuervo Camilo
Принадлежит:

Embodiments of the present disclosure relate to methods and systems for switching a magnetic field external to a magnet assembly having two permanent magnets, including a fixed permanent magnet portion and a switching permanent magnet portion, where a switching magnetic field is used to switch the magnetization of the switching permanent magnet portion, but not switch the magnetization of the fixed permanent magnet portion. In this way, the fixed permanent magnet portion has a fixed magnetization, such that the direction of magnetization of the fixed permanent magnet portion remains the same during switching of the magnetization of the switching permanent magnet portion, and the switching permanent magnet portion has a switching magnetization, such that the direction of magnetization of the switching permanent magnet portion is switched during switching of the magnetization of the switching permanent magnet portion. 1. A method for switching a magnetic field external to a magnet assembly comprising: at least one fixed permanent magnet having a first direction of magnetization from a south end of the at least one fixed permanent magnet to a north end of the at least one fixed permanent magnet, wherein the first direction of magnetization is in a first direction;', 'at least one switching permanent magnet having a second direction of magnetization from a south end of the at least one switching permanent magnet to a north end of the at least one switching permanent magnet, and', 'wherein one or more fixed permanent magnets of the at least one fixed permanent magnet are positioned at least partially within a corresponding one or more bores through a first switching permanent magnet of the at least one switching permanent magnet or one or more switchable permanent magnets of the at least one switching permanent magnet are positioned at least partially within a corresponding one or more bores through a first fixed permanent magnet of the at least one fixed permanent ...

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Номер записи: 69
16-06-2016 дата публикации

Method and equipment for magnetic nanopatterning of substrates

Номер: US20160172092A1
Автор: ALBISETTI Edoardo, Bertacco Riccardo, Petti Daniela, RIEDO Elisa
Принадлежит:

Method for magnetic nanopatterning of a substrate 10, said substrate comprising a first ferromagnetic or ferrimagnetic phase FM and a second antiferromagnetic phase AF, said FM and AF phases being coupled by exchange bias in such a way to form an exchange bias system; said method comprising submitting said substrate to a magnetic field Hso as to set the magnetization of said first phase FM in the direction of said magnetic field H, while heating predefined portions of said antiferromagnetic phase AF up to a writing temperature Tat which the exchange bias can be influenced, equipment for carrying out said method and substrate nanopatterned according to said method. 119-. (canceled)20. A method for magnetic nanopatterning of a substrate , the substrate comprising a ferromagnetic or ferrimagnetic phase and an antiferromagnetic phase , the ferromagnetic or ferrimagnetic phase and the antiferromagnetic phase being coupled by exchange bias in such a way to form an exchange bias system; the method comprising:submitting the substrate to a magnetic field oriented at any angle with respect to a reference direction of the substrate so as to set the magnetization of the ferromagnetic or ferrimagnetic phase in the direction of the magnetic field, while heating predefined portions of the antiferromagnetic phase up to a writing temperature at which the exchange bias can be influenced;allowing the predefined portions of the antiferromagnetic phase to cool down to a temperature below the writing temperature;removing the magnetic field.21. (canceled)22. The method of claim 20 , wherein the ferromagnetic or ferrimagnetic phase and the antiferromagnetic phase correspond to different antiferromagnetic and ferromagnetic or ferrimagnetic phases claim 20 , chemically or structurally identified claim 20 , within a composite material.23. (canceled)24. The method of claim 20 , wherein the substrate is a multilayer and each of the antiferromagnetic and ferromagnetic or ferrimagnetic phases to ...

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Номер записи: 70
11-09-2014 дата публикации

MAGNETIZATION DEVICE AND METHOD

Номер: US20140253270A1
Автор: NICHOLLS Robert, Sobrino Eliseo
Принадлежит: eZono AG

A magnetizer for a tissue-penetrating medical tool such as a needle, cannula, stylet, or catheter consist of a magnetic flux generator which generates a magnetic field in a tool-receiving space. The tool can be passed through or into and out of the space to magnetise it. Optionally the space can be defined by a disposable plastics tube, with a closed end, so that a defined length of the tool is magnetised. The magnetic flux generator can be a permanent magnet or electromagnet. Alternatively a conveyor belt can be used to transport a tissue-penetrating medical tool through a magnetic field generated by an electromagnet with the belt and the electromagnetic being controlled in response to an optical sensor for detecting the position of the tissue-penetrating medical tool. The device is suitable for magnetising tools for use in surgical procedures where the tool is to be magnetically tracked.

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Номер записи: 71
25-06-2015 дата публикации

APPARATUS AND METHOD FOR FINE-TUNING MAGNET ARRAYS WITH LOCALIZED ENERGY DELIVERY

Номер: US20150179327A1
Автор: GERLING JOHN
Принадлежит:

One embodiment relates to an apparatus for adjustment of local magnetic strength in a magnetic device. A stage holds the magnetic device, and a sensor measures a magnetic field at locations above the magnetic device so as to generate magnetic field data. A computer system detects a non-uniformity in the magnetic field from the magnetic field data and determines a location and a duration for application of a pulsed laser beam to correct the non-uniformity. A laser device applies the pulsed laser beam at said location for said duration. Another embodiment relates to a method of adjusting local magnetic strength in a magnetic device. Another embodiment relates to a system for fine-tuning a magnet array with localized energy delivery. Other embodiments, aspects and features are also disclosed. 1. An apparatus for adjustment of local magnetic strength in a magnetic device , the apparatus comprising:a stage for holding the magnetic device;a sensor that measures a magnetic field at locations above the magnetic device so as to generate magnetic field data;a computer system that detects a non-uniformity in the magnetic field from the magnetic field data and determines a location and a duration for application of a pulsed laser beam to correct the non-uniformity; anda laser device that applies the pulsed laser beam at said location for said duration.2. The apparatus of claim 1 , wherein the stage comprises a translatable stage that is controlled by the computer system.3. The apparatus of claim 2 , wherein translatable stage controllably moves the magnetic device in three dimensions.4. The apparatus of claim 1 , wherein the sensor comprises a Hall sensor that measures the magnetic field using the Hall effect.5. The apparatus of claim 1 , wherein the sensor comprises a magnetorestrictive sensor.6. The apparatus of claim 1 , wherein the sensor comprises a giant magnetorestrictive sensor.7. The apparatus of claim 1 , wherein the sensor comprises a magneto optical Kerr effect ...

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Номер записи: 72
21-05-2020 дата публикации

RARE-EARTH SINTERED MAGNET AND RARE-EARTH SINTERED MAGNET SINTERED BODY FOR USE WITH SAME, AND MAGNETIC FIELD APPLYING DEVICE USABLE FOR MANUFACTURING SAME

Номер: US20200161032A1
Автор: FUJIKAWA Kenichi, Kume Katsuya, Ozaki Takashi, SAITO Shoichiro, Yamamoto Takashi
Принадлежит:

The rare-earth sintered magnet has a configuration in which a large number of magnet material particles including a rare-earth substance and each having an axis of easy magnetization have been integrally sintered. The rare-earth sintered magnet is provided with a first surface and a second surface opposing each other in the thickness direction. In a plane in parallel with a width direction and the thickness direction, the magnet material particles are magnetized such that, in a region extending from each of both end portions in the width direction toward the center portion in the width direction, the orientation direction of the easy magnetization axis is gradually changed. A maximum surface magnetic flux density in the first surface and a maximum surface magnetic flux density in the second surface satisfy the relationship (D/D)≥4. 1. A rare-earth sintered magnet having a configuration in which a large number of magnet material particles including a rare-earth substance and each having an axis of easy magnetization are integrally sintered ,the rare-earth sintered magnet having a three-dimensional shape with a width direction, a thickness direction, and a length direction and including a first surface and a second surface opposing each other in the thickness direction, whereinin a plane in parallel with the width direction and the thickness direction, the magnet material particles are oriented such that an orientation direction of the easy magnetization axis is gradually changed in a region from each of both end portions in the width direction toward a center portion in the width direction; and{'b': 1', '2', '1', '2, 'a maximum surface magnetic flux density (D) on the first surface and the maximum surface magnetic flux density (D) on the second surface satisfy a relationship of (D/D)≥4.'}2. The rare-earth sintered magnet according to claim 1 , whereinthe orientation direction of the easy magnetization axis is different between each of the both end portions in the ...

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Номер записи: 73
18-09-2014 дата публикации

MOBILE EAS DEACTIVATOR

Номер: US20140268472A1
Автор: DREW Douglas A., EASTER Ronald B.
Принадлежит: Tyco Fire & Security GmbH

A deactivator device for a mobile Point of Sale (mPOS) systems includes a pair of spaced apart, fixed position electromagnets positioned and configured such that magnetic fields generated by the electromagnets aid one another to form a combined magnetic field; a battery; a capacitor; and an electronics assembly including a microcontroller configured to control storage of energy from the battery in the capacitor and to selectively provide a deactivation or activation pulse from the capacitor to the electromagnets. The components may be positioned in a housing configured for attachment to a mPOS mobile device. 1. A deactivator device for a mobile Point of Sale (mPOS) systems , comprising:a pair of spaced apart, fixed position electromagnets positioned and configured such that magnetic fields generated by the electromagnets aid one another to form a combined magnetic field;a battery;a capacitor; andan electronics assembly including a microcontroller configured to control storage of energy from the battery in the capacitor and to selectively provide a deactivation or activation pulse from the capacitor to the electromagnets.2. The deactivator device according to wherein each electromagnet includes a linear core with an electrically conductive coil wrapped thereabout.3. The deactivator device according to wherein one of the electromagnets is configured such that an upper end defines the north pole thereof and the other of the electromagnets is configured such that the lower end defines the north pole thereof.4. The deactivator device according to wherein the capacitor is positioned between the spaced apart electromagnets.5. The deactivator device according to wherein the capacitor has a depth approximately equal to a depth of the electromagnets.6. The deactivator device according to wherein a return bar is positioned between the electromagnets and the electronics assembly.7. The deactivator device according to wherein the microcontroller provides the deactivation or ...

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Номер записи: 74
28-06-2018 дата публикации

Magnet Assembly

Номер: US20180182524A1
Автор: Bolsman Caspar Titus, Bruins Wouter, Franciscus Theodorus Van der Beek Gerardus Johannes, Groffen Camiel Eugène, Hijman Jan
Принадлежит:

The present invention provides a receiver comprising a housing, an armature, and a magnet assembly, where the armature and the magnet assembly are arranged in the housing. The magnet assembly comprises a magnet and a magnet shell. The magnet shell forms an inner space in which the magnet is provided, and where at least a part of the armature extends in the inner space. The magnet shell comprises at least two shell parts forming an inner surface encircling the inner space, where each of the shell parts comprises a first and a second end face. The first end face of a first shell part abuts one of the first and second end faces of an adjacent shell part, and the second end face of the first shell part abuts one of the first and second ends faces of an adjacent shell part. 1. A receiver comprising a housing , an armature , and a magnet assembly , the armature and the magnet assembly being arranged in the housing , the magnet assembly comprising a magnet and a magnet shell , the magnet shell forming an inner space in which the magnet is provided , wherein at least a part of the armature extends in the inner space , wherein the magnet shell comprises at least two shell parts forming an inner surface substantially encircling the inner space , and wherein the shell parts each comprises a first and a second end face , and the first end face of a first shell part abuts one of the first and second end faces of an adjacent shell part , the second end face of the first shell part abuts one of the first and second ends faces of an adjacent shell part.2. A receiver according to claim 1 , wherein each shell part further comprises an outer surface part and an inner surface part claim 1 , the end faces forming an edge arranged in the transition between the outer surface part and the inner surface part claim 1 , wherein each outer surface part forms part of the outer surface of the magnet shell and each inner surface part forms part of the inner surface encircling the inner space ...

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Номер записи: 75
13-06-2019 дата публикации

Cover For Tissue Penetrating Device With Integrated Magnets And Magnetic Shielding

Номер: US20190180902A1
Автор: "OBryan Jeffrey C.", Burkholz Jonathan Karl, Harding Weston F., Isaacson S. Ray, Ma Yiping
Принадлежит:

A cover for magnetizing a shaft of a tissue-penetrating medical device is disclosed including a sleeve member having a hollow body to form a protective closure over the shaft of the tissue-penetrating medical device. The proximal end of the hollow body provides a receiving space for receiving the shaft of the tissue-penetrating medical device. One or more magnet is disposed on the sleeve member. A magnetic shield composed of one or more shielding materials associated with the cover that minimizes any effects to the clinical environment from magnetic fields generated within the cover. Medical devices, assemblies and methods of magnetizing the shaft of a tissue-penetrating medical device using the cover are also disclosed. 1. An assembly comprising:a tissue-penetrating medical device having a distal tip, a housing, and a shaft mounted to the housing by a hub, the hub including a hub magnet; anda cover for magnetizing the tissue-penetrating medical device, the cover including a sleeve member having a hollow body with an exterior surface, an interior surface, a proximal end, and a distal end to form a protective closure over a shaft of a tissue-penetrating medical device having a longitudinal axis, the proximal end of the hollow body providing a receiving space for receiving at least a shaft of the tissue-penetrating medical device; one or more magnets disposed along the sleeve member effective to magnetize the shaft; and a magnetic shield composed of one or more shielding materials spray-coated onto the sleeve member, a first face of the one or more magnets being exposed to the receiving space and an opposite face of the one of one or more magnets being exposed to the magnetic shield.2. The assembly of claim 1 , wherein the receiving space permits movement of the shaft of the tissue-penetrating medical device in the receiving space in a direction parallel to the longitudinal axis of the tissue-penetrating medical device.3. The assembly of claim 1 , wherein the ...

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Номер записи: 76
04-06-2020 дата публикации

DEVICE FOR DEMAGNETIZING FERROMAGNETIC MATERIALS

Номер: US20200176165A1
Автор: Meyer Urs
Принадлежит:

A particularly useful, technically robust, simply constructed and energy-saving device generating a magnetic field of alternating polarity by means of a current-carrying coil for the demagnetization of ferromagnetic materials. 1. A device for demagnetizing ferromagnetic materials , comprising an inductance in the form of a magnetic coil and a capacitance , which together form an electric oscillator circuit , and a circuit for supplying electric energy , wherein the oscillation of voltage and current prevailing in the oscillator circuit is established and maintained automatically and exclusively at the resonance frequency.2. The device according to claim 1 , wherein the circuit for supplying electric energy is temporally controlled by the voltage and current values prevailing in the oscillator circuit.3. The device according to claim 2 , wherein the circuit for supplying electric energy to the oscillator circuit is regulated to a predefined setpoint value of the alternating voltage in the oscillator circuit.4. The device according to claim 2 , wherein the circuit for supplying electric energy to the oscillator circuit is regulated to a predefined setpoint value of the alternating current in the oscillator circuit.5. The device according to claim 1 , wherein energy is supplied to the oscillator circuit by the temporally controlled connection of an external voltage source.6. The device according to claim 1 , wherein energy is supplied to the oscillator circuit by the temporally controlled connection of an external current source.7. The device according to claim 5 , wherein the voltage source that supplies the energy is alternatingly switched in two polarities.8. The device according to claim 5 , wherein the circuit that supplies the energy operates with a bipolar voltage source claim 5 , and wherein the two polarities are alternatingly switched by two switching elements.9. The device according to claim 5 , wherein the coil that forms the oscillator circuit is provided ...

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Номер записи: 77
23-07-2015 дата публикации

CORE MANUFACTURING DEVICE AND CORE MANUFACTURING METHOD

Номер: US20150206642A1
Автор: KANDA Naotake, NIMURA Keita, YAMAGUCHI Ryosuke
Принадлежит:

A manufacturing device for a rotor core includes: a magnetization device that magnetizes magnet raw materials before being magnetized disposed in magnet insertion holes of the rotor core to turn the magnet raw materials before being magnetized into permanent magnets; and a detachment device that detaches the rotor core from the magnetization device. The detachment device also functions as a mounting device that mounts a jig around the rotor core when the rotor core is detached from the magnetization device. 1. A manufacturing device for a core , comprising:a magnetization device that magnetizes magnet raw materials before being magnetized provided in the core to turn the magnet raw materials before being magnetized into permanent magnets;a detachment device that detaches the core from the magnetization device; anda mounting device that mounts a jig composed of a magnetic body or an electromagnet to the core, whereinthe jig is being mounted around the detached core when the core is detached from the magnetization device by the detachment device.2. The manufacturing device for a core according to claim 1 , whereinthe mounting device is configured to mount the jig to the core detached from the magnetization device by the detachment device.3. The manufacturing device for a core according to claim 1 , whereinthe jig is composed of a soft magnetic body;the mounting device is configured to mount the jig to the core before the magnet raw materials are magnetized; andthe detachment device is configured to detach the core together with the jig from the magnetization device.4. The manufacturing device for a core according to claim 3 , whereinthe core is formed in a cylindrical shape, and has different magnetic poles provided in an outer peripheral portion by the permanent magnets and arranged alternately at equiangular intervals along a circumferential direction;the jig has magnetic barriers arranged at the equiangular intervals in the circumferential direction;the mounting ...

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Номер записи: 78
21-07-2016 дата публикации

Systems and Methods for Producing Magnetic Structures

Номер: US20160211066A1
Автор: Fullerton Larry W., Morgan Jason N., Roberts Mark D.
Принадлежит: Correlated Magnetics Research, LLC

A system for magnetizing magnetic sources into a rare earth permanent magnet material includes a first inductor coil, a second inductor coil, and at least one magnetizing circuit for supplying a first current having a first direction for a first duration to said first inductor coil to produce a first magnetic field and a second current having a second direction for a second duration to said second inductor coil to produce a second magnetic field. The first inductor coil comprises a first plurality of layers of a flat conductor about a first aperture positioned on a first side of the rare earth permanent magnet material at a first location where a magnetic source is to be magnetized into the rare earth permanent magnet material from the first side of the rare earth permanent magnet material. The second inductor coil comprising a second plurality of layers of a flat conductor coiled about a second aperture positioned on a second side of the rare earth permanent magnet material at a second location where a magnetic source is to be magnetized into the rare earth permanent magnet material from the second side of said rare earth permanent magnet material, where the second side is opposite the first side. 1. A system for magnetizing magnetic sources into a rare earth permanent magnet material; comprising:a first inductor coil comprising a first plurality of layers of a flat conductor about a first aperture positioned on a first side of said rare earth permanent magnet material at a first location where a magnetic source is to be magnetized into said rare earth permanent magnet material from said first side of said rare earth permanent magnet material;a second inductor coil comprising a second plurality of layers of a flat conductor coiled about a second aperture positioned on a second side of said rare earth permanent magnet material at a second location where a magnetic source is to be magnetized into said rare earth permanent magnet material from said second side of said ...

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Номер записи: 79
18-06-2020 дата публикации

MAGNETIZATION STABILIZING TREATMENT METHOD FOR PERMANENTLY MAGNETIZABLE MATERIAL

Номер: US20200194152A1
Автор: LIU Lei, Liu Zhuang, SUN Yingli, YAN Aru, Zhang Xin
Принадлежит:

The present disclosure discloses a method for the magnetism stabilizing treatment of a permanent magnet material. The method can include the following steps: providing a permanent magnet material having a positive temperature coefficient of coercivity; magnetizing the permanent magnet material at a temperature Twith a range of −200 degree centigrades to 200 degree centigrades; and performing a magnetism stabilizing treatment towards the permanent magnet material with temperature decreased in a range of the temperature Tto a temperature T, or at the temperature T. 1. A method for magnetism stabilizing treatment of a permanent magnet material , wherein the method comprises following steps:providing a permanent magnet material having a positive temperature coefficient of coercivity;{'sub': '3', 'magnetizing the permanent magnet material at a temperature Tat a range of −200 degree centigrades to 200 degree centigrades; and'}{'sub': 3', '4', '3, 'performing a magnetism stabilizing treatment towards the permanent magnet material at a lower temperature in a range between the temperature Tand a temperature T, or at the temperature T.'}2. The method of claim 1 , wherein the permanent magnet material comprises a microstructure having a first magnetic phase and a second magnetic phase claim 1 , the first magnetic phase and the second magnetic phase are isolated from each other claim 1 , the first magnetic phase is a magnetic phase with uniaxial anisotropy claim 1 , and the second magnetic phase is a magnetic phase with spin reorientation transition.3. The method of claim 1 , wherein the temperature Tis in a range of 10 degree centigrades to 40 degree centigrades.4. The method of claim 1 , wherein the permanent magnet material has the positive temperature coefficient of coercivity in a temperature range of Tto T claim 1 , and the temperature Tis higher than or equal to the temperature T.5. The method of claim 4 , wherein the temperature Tis higher than or equal to the ...

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Номер записи: 80
04-07-2019 дата публикации

ELECTRICAL MACHINE AND METHOD FOR OPERATING AN ELECTRICAL MACHINE

Номер: US20190207550A1
Автор: Castagnini Alessandro, Liu Liming, Perigo Elio Alberto, Secondo Giulio, Tremelling Darren
Принадлежит:

A method for operating an electrical machine having a stator and having a rotor with permanent magnets, includes: running the electrical machine; determining, while performing the running of the electrical machine, whether the permanent magnets have been demagnetized; finding, while running the electrical machine, the q-axis responsive to a determination that the permanent magnets have been demagnetized; firing a current pulse through the stator, while running the electrical machine, when the q-axis reaches a desired position relative to a selected stator phase, wherein the current pulse is constructed to remagnetize the permanent magnets; and continuing to run the electrical machine. 1. A method for operating an electrical machine having a stator and having a rotor with permanent magnets , comprising:running the electrical machine;determining, while performing the running of the electrical machine, whether the permanent magnets have been demagnetized;finding, while running the electrical machine, the q-axis responsive to a determination that the permanent magnets have been demagnetized;firing a current pulse through the stator, while running the electrical machine, when the q-axis reaches a desired position relative to a selected stator phase, wherein the current pulse is constructed to remagnetize the permanent magnets; andcontinuing to run the electrical machine.2. The method of claim 1 , wherein the determining whether the permanent magnets have been demagnetized includes estimating operating conditions of the electrical machine while running the electrical machine.3. The method of claim 2 , wherein the determining whether the permanent magnets have been demagnetized includes determining claim 2 , while running the electrical machine claim 2 , whether the electrical machine is operating within desired performance limits based on the estimated operating conditions.4. The method of claim 3 , wherein the determining whether the electrical machine is operating ...

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Номер записи: 81
13-08-2015 дата публикации

MULTIDIRECTIONAL MAGNETIC PARTICLE INSPECTION SYSTEM

Номер: US20150228392A1
Автор: Lombardo Erik A., Segletes David S.
Принадлежит: SIEMENS ENERGY, INC.

A magnetic particle inspection system for inspecting a plurality of articles The system includes a first magnetizing coil for generating a first magnetic field oriented in a first direction The system also includes a second magnetizing coil for generating a second magnetic field oriented in a second direction perpendicular to the first direction, wherein the first and second magnetizing coils are located in a common plane In addition, the system may include a mat having a plurality of drainage holes, wherein the first and second magnetizing coils are located in the mat and the first and second magnetizing coils are sized to inspect a plurality of articles Further, the system includes a power supply for supplying power for energizing the first and second magnetizing coils and a switching unit for switching current flow between the first and second magnetizing coils. 1. A magnetic particle inspection system , comprising.a first magnetizing coil oriented in a first direction,a second magnetizing coil oriented in a second direction perpendicular to the first orientation, wherein the first and second magnetizing coils are located in a common plane;a power supply for supplying power for energizing the first and second magnetizing coils, anda switching unit for switching current flow between the first and second magnetizing coils2. The system according to claim 1 , wherein the first and second magnetizing coils are each configured as a rectangular spiral.3. The system according to claim 1 , wherein the first and second magnetizing coils form an inspection zone4. The system according to claim 3 , further including magnetic shields for shielding end areas of the first and second magnetizing coils from the inspection zone5. The system according to claim 1 , wherein the first magnetizing coil is energized by current having a frequency which is different than the current used to energize the second magnetizing coil6. The system according to claim 1 , wherein the power supply ...

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Номер записи: 82
02-07-2020 дата публикации

METHOD FOR MAGNETISING AT LEAST TWO MAGNETS HAVING DIFFERENT MAGNETIC COERCIVITY

Номер: US20200211747A1
Автор: HEINRICH Jens, Hoffmann Ralf, Mueller Christian
Принадлежит:

A method for magnetizing at least two magnets having different magnetic coercivities, includes the steps of: 1. A method for magnetizing at least two magnets having different magnetic coercivities , the method comprising the steps of:a) simultaneously exposing the at least two magnets to a first substantially homogeneous magnetic field having a predeterminable first field strength and a first magnetic field direction for completely magnetizing the magnets in the first magnetic field direction;b) simultaneously exposing the magnets magnetized in step a) to a second substantially homogeneous magnetic field having a predeterminable second field strength and a second magnetic field direction opposite to the first magnetic field direction such that the at least two magnets are differently magnetized, the first field strength being higher than the second field strength.2. The method according to claim 1 , wherein:before carrying out steps a) and b), further comprising the step of arranging the at least two magnets in a magnetization device the first and second magnetic fields being provided by the magnetization device.3. The method according to claim 1 , further comprising the step of:arranging the at least two magnets one behind the other relative to the first and second magnetic field directions.4. The method according to claim 1 , wherein:in step b), the predeterminable second field strength of the second magnetic field is set such that the at least two magnets are magnetized in opposite directions, the magnet having the higher magnetic coercivity being magnetized in the first magnetic field direction and the magnet having the lower coercivity being magnetized in the second magnetic field direction.5. The method according to claim 1 , further comprising the step of:unmagnetizing or premagnetizing the at least two magnets before carrying out steps a) and b).6. The method according to claim 2 , wherein:the at least two magnets are arranged one behind the other relative ...

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Номер записи: 83
18-07-2019 дата публикации

ELECTRIC MACHINE INCLUDING MAGNETS HAVING DIFFERENT MAGNETIC CHARACTERISTICS

Номер: US20190222076A1
Автор: Tangudu Jagadeesh K., Wawrzyniak Beata I.
Принадлежит:

An illustrative example machine includes a rotatable body and a plurality of magnetic poles supported by the rotatable body. Each of the plurality of magnet poles comprises a plurality of magnet segments. A first magnet segment of each of the magnet poles has a first magnetic characteristic that affects a magnetic flux associated with the respective magnet pole in a first way. A second magnet segment of each magnet pole has a second magnetic characteristic that affects the magnetic flux associated with the respective magnet pole in a second way. The first magnetic characteristic is different than the second magnetic characteristic and the first way in which the different magnet segments affect the magnetic flux is different than the second way. 1. A machine , comprising:a rotatable body; anda plurality of magnet poles supported by the rotatable body, each of the plurality of magnet poles comprising a plurality of magnet segments, a first magnet segment of each of the magnet poles having a first magnetic characteristic that affects a magnetic flux associated with the respective magnet pole in a first way, a second magnet segment of each of the magnet poles having a second magnetic characteristic that affects the magnetic flux associated with the respective magnet pole in a second way, the first magnetic characteristic being different than the second magnetic characteristic, the first way being different than the second way.2. The machine of claim 1 , whereinthe first magnetic characteristic comprises a first magnet strength; andthe second magnetic characteristic comprises a second magnet strength.3. The machine of claim 2 , whereinthe first magnetic characteristic comprises a first magnet thickness; andthe second magnetic characteristic comprises a second magnet thickness.4. The machine of claim 2 , whereinthe first magnet strength is greater than the second magnet strength; andthe first way that the first magnet strength affects the magnetic flux comprises ...

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Номер записи: 84
27-08-2015 дата публикации

MAGNETIZATION DEVICE FOR MAGNETIC ENCODER

Номер: US20150243427A1
Автор: Takahashi Toru, Ueno Shintarou
Принадлежит: NTN CORPORATION

In a magnetization device, while an annular magnetic body including plural rows of annular un-magnetized magnetic encoder tracks which are arranged adjacent to each other and integrated therewith is rotated, magnetization is performed, thereby providing a magnetic encoder. The magnetization device includes: a magnetizing yoke including a pair of opposed end portions opposed to each other across a magnetic gap; an exciting coil wound on the magnetizing yoke; a magnetization power source supplying a magnetizing current to the exciting coil to pass magnetic flux between the opposed end portions; and a magnetic shield which is provided to the magnetizing yoke and shields flow of the magnetic flux to the rows of magnetic encoder tracks other than a magnetization target. 1. A magnetization device for a magnetic encoder , in which while an annular magnetic body including plural rows of annular un-magnetized magnetic encoder tracks which are arranged adjacent to each other and integrated therewith is rotated , portions of each magnetic encoder track in a circumferential direction thereof are magnetized one by one , thereby providing the magnetic encoder in which magnetic patterns different from each other are formed in the respective magnetic encoder tracks , the magnetization device comprising:a magnetizing yoke including a pair of opposed end portions magnetically opposed to each other across a magnetic gap, the magnetizing yoke being configured to magnetize the magnetic encoder track of the magnetic encoder which magnetic encoder track is disposed at a determined position and in a determined attitude with respect to these opposed end portions;an exciting coil wound on the magnetizing yoke and configured to pass magnetic flux between the opposed end portions when power is supplied thereto; anda magnetic shield provided to the magnetizing yoke and configured to shield flow of the magnetic flux to the rows of magnetic encoder tracks other than a magnetization target.2. The ...

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Номер записи: 85
16-08-2018 дата публикации

MAGNETIZATION METHOD, MAGNETIZATION APPARATUS AND MAGNET FOR MAGNETIC ENCODER

Номер: US20180233261A1
Автор: SENO Hiroshi
Принадлежит:

A magnetization method and a magnetization apparatus for forming an objective magnetized state in a one-dimensional region of a magnetic body, and a magnet for a magnetic encoder. In the magnetization method, magnetism in one direction is applied to an entire half wavelength interval of a sine wave on the magnetic body by a magnetizing yoke and a magnetized state of a first-order rectangle wave or of a first-order trapezoidal wave is formed in the interval, the magnetized state presenting polarity information in a rectangle or trapezoidal pulse shape; and thereafter, magnetism in opposite direction is applied to a start point and a terminal point of the interval by the same magnetizing yoke or a different magnetizing yoke one time or several times and the magnetized state of the first-order rectangle wave or of the first-order trapezoidal wave is changed into the objective magnetized state. 1. A magnetization method for forming an objective magnetized state presenting a half wavelength pulse of a sine wave in a one-dimensional region of a magnetic body , the magnetization method comprising:applying magnetism in one direction to an entire half wavelength interval of the sine wave on the magnetic body by a magnetizing yoke and forming a magnetized state of a first-order rectangle wave or of a first-order trapezoidal wave in the interval, the magnetized state presenting polarity information in a rectangle or trapezoidal pulse shape, and thereafter,applying magnetism in opposite direction to a start point and a terminal point of the interval by the same magnetizing yoke or a different magnetizing yoke one time or several times and changing the magnetized state of the first-order rectangle wave or of the first-order trapezoidal wave into the objective magnetized state.2. The magnetization method as set forth in claim 1 ,wherein magnetism in opposite direction is applied respectively to one third of regions on a start point side and on a terminal point side of the ...

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Номер записи: 86
16-07-2020 дата публикации

Magnetizing Device With Reduced Stray Field

Номер: US20200227193A1
Автор: Bartos Axel, Meisenberg Armin, Pieper Reinhold
Принадлежит: TE Connectivity Germany GmbH

A magnetizing device includes a magnet and a magnetic field concentrator. The magnet has a magnetic field forming a magnetization region in which a magnetizable security element is exposed to a magnetic field strength having a defined magnetic field direction. The magnetic field concentrator is formed of a ferromagnetic material. The magnetic field concentrator is arranged in the magnetic field and amplifies and focuses the magnetic field in the magnetization region. 1. A magnetizing device , comprising:a first magnet having a magnetic field forming a magnetization region in which a magnetizable security element is exposed to a magnetic field strength having a defined magnetic field direction; anda first magnetic field concentrator formed of a ferromagnetic material, the first magnetic field concentrator is arranged in the magnetic field and amplifies and focuses the magnetic field in the magnetization region.2. The magnetizing device of claim 1 , wherein the first magnet is a permanent magnet.3. The magnetizing device of claim 2 , wherein the first magnet has a block shape.4. The magnetizing device of claim 1 , wherein the first magnetic field concentrator is a sheet of soft magnetic material with a high permeability.5. The magnetizing device of claim 1 , wherein the magnetizable security element is transported in a transport direction through the magnetization region.6. The magnetizing device of claim 5 , wherein the first magnetic field concentrator deflects a plurality of magnetic field lines of the magnetic field to concentrate the magnetic field at a side of the first magnet facing the transport direction.7. The magnetizing device of claim 5 , wherein an air gap is disposed between the first magnetic field concentrator and the first magnet in the transport direction.8. The magnetizing device of claim 5 , wherein the first magnetic field concentrator is directly adjacent to the first magnet in the transport direction.9. The magnetizing device of claim 1 , ...

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Номер записи: 87
24-08-2017 дата публикации

MAGNET ARRANGEMENT AND SENSOR DEVICE

Номер: US20170241802A1
Автор: Ausserlechner Udo
Принадлежит:

Magnet arrangements, sensor devices and corresponding methods are provided comprising a first magnet portion and a second magnet portion. The first magnet portion is spaced apart from the second magnet portion, and the second magnet portion comprises a bore. In a corresponding sensor device, a sensor element may be provided at a position between the first and second magnet portions. 1. A magnet arrangement configured to be rotatable about an axis , comprising:a first magnet portion, a center of the first magnet portion being essentially on the axis,a second magnet portion spaced apart from the first magnet portion in a direction of the axis, a center of the second magnet portion being essentially on the axis, the second magnet portion comprising a central bore.2. The magnet arrangement of claim 1 , wherein the first magnet portion has an N-fold rotational symmetry claim 1 , with N equal to or greater than 2 claim 1 , with respect to the axis or is rotationally symmetric with respect to the axis.3. The magnet arrangement of claim 1 , wherein the first magnet portion has a cylindrical shape claim 1 , a tapered conical shape or a mixture thereof.4. The magnet arrangement of claim 1 , wherein the second magnet portion has an M-fold rotational symmetry claim 1 , M being equal to or greater than 2 claim 1 , with respect to the axis or is rotationally symmetric with respect to the axis.5. The magnet arrangement of claim 1 , wherein the second magnet portion is ring-shaped.6. The magnet arrangement of claim 1 , wherein the first magnet portion and the second magnet portion are provided as separate magnets.7. The magnet arrangement of claim 6 , wherein the first magnet portion and second magnet portion are linked by a linking portion having a relative permeability below 100.8. The magnet arrangement of claim 7 , wherein the first magnet portion and/or the second magnet portion comprises a fixing element for fixing the first magnet portion and/or the second magnet portion to ...

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Номер записи: 88
27-11-2014 дата публикации

IN SITU OLIGONUCLEOTIDE SYNTHESIS ON A PARAMAGNETIC SUPPORT

Номер: US20140350235A1
Автор: Akhras Michael S., Jensen Michael A.
Принадлежит: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY

A novel method for attaching oligonucleotides to a paramagnetic solid support is disclosed. Conventional methods of attachment require that oligonucleotides be pre-synthesized with specific end modifications, which is laborious and expensive. Instead, we attached oligonucleotides to paramagnetic beads by direct synthesis of the oligonucleotides on the surface of the beads. An external magnet was used to hold the paramagnetic beads in place during solid-phase synthesis. A magnetic force was applied directly to the beads to prevent their loss, in particular, during reagent purge-to-waste steps that involved high-pressure drain or vacuum. This method can be adapted for use in any laboratory working with conventional synthesis automation, and can be employed, for example, with single columns and multi-well titer plates. 1. A method for synthesis of an oligonucleotide , the method comprising:a) providing a paramagnetic solid support comprising a substrate coating the surface of the solid support, wherein the substrate comprises one or more functional groups capable of covalent attachment to a linker;b) providing a magnet that attracts the paramagnetic solid support, whereby the paramagnetic solid support is immobilized on the surface of the magnet or a surface in contact with the magnetic field of the magnet;c) covalently attaching phosphoramidite linkers to functional groups on the substrate to produce a derivatized support;d) reacting the derivatized support with a nucleoside phosphoramidite corresponding to the first nucleotide of the desired oligonucleotide sequence such that the nucleoside phosphoramidite attaches covalently to a phosphoramidite linker; ande) adding nucleoside phosphoramidites stepwise to the growing nucleotide chain until an oligonucleotide having the desired sequence is produced.2. The method of claim 1 , wherein the functional group used for attachment of the linker is a hydroxyl group or an amino group.3. The method of claim 1 , wherein the ...

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Номер записи: 89
14-10-2021 дата публикации

DETECTION OF MAGNETIC PULSE AND ORIENTATION WHEN MAGNETIZING

Номер: US20210319940A1
Автор: JUSTESEN Bo, KIRT Jesper, PETERSEN Tanja Lykke
Принадлежит:

Disclosed is a magnetizing pulse detector that detects magnetizing pulses produced by a magnetizing coil; the magnetizing pulse detector comprising: a measuring coil configured to generate a measuring pulse in response to a magnetizing pulse produced by the magnetizing coil; a measuring pulse detection circuit configured to generate a detection signal based on the measuring pulse generated by the measuring coil; and a duration extension circuit configured to generate an extended detection signal based on the detection signal generated by the measuring pulse detection circuit. 1. A magnetizing pulse detector that detects magnetizing pulses produced by a magnetizing coil; the magnetizing pulse detector comprising:a measuring coil configured to generate a measuring pulse in response to a magnetizing pulse produced by the magnetizing coil;a measuring pulse detection circuit configured to generate a detection signal based on the measuring pulse generated by the measuring coil; anda duration extension circuit configured to generate an extended detection signal based on the detection signal generated by the measuring pulse detection circuit.2. The magnetizing pulse detector of claim 1 , wherein the measuring pulse detection circuit comprises a plurality of Zener diodes connected in parallel to one another and connected in parallel with the measuring coil.3. The magnetizing pulse detector of claim 2 , wherein each of the Zener diodes of the plurality of Zener diodes has a Zener voltage of 24 volts.4. The magnetizing pulse detector of claim 2 , wherein the measuring pulse detection circuit further comprises a rectifier diode claim 2 , where the cathode of the rectifier diode is coupled to one of the positive and the negative sides of the measuring coil claim 2 , and the anode of the rectifier diode is coupled to the anodes of the plurality of parallel-connected Zener diodes.5. The magnetizing pulse detector of claim 2 , wherein the duration extension circuit is configured to ...

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Номер записи: 90
14-09-2017 дата публикации

IMAGE FORMING APPARATUS WITH TRANSPORT FOR MAGNETIC SHEETS

Номер: US20170261907A1
Автор: ISHIDA Kazufumi
Принадлежит:

A magnetic sheet transport apparatus according to an embodiment includes a transport path on which a magnetic sheet having a magnetic flux is transported. A magnetic member is disposed on the transport path. A separation unit is disposed on the magnetic member. The separation unit causes the magnetic sheet to be separated from the magnetic member so that the magnetic sheet being transported on the transport path is not pushed onto the magnetic member by the magnetic flux. 1. A magnetic sheet transport apparatus comprising:a transport path on which a magnetic sheet having a magnetic flux is transported through an image forming section in which an image is formed on the magnetic sheeta magnetic member forming at least a portion of the transport path in at least one of an upstream direction of the image forming section and a downstream direction of the image forming section; anda separation unit disposed on the magnetic member and configured to cause the magnetic sheet to be separated from the magnetic member so that the magnetic sheet being transported on the transport path is not pushed onto the magnetic member by the magnetic flux.2. The magnetic sheet transport apparatus according to claim 1 , wherein the separation unit includes a non-magnetic member that is provided on a transport path side with respect to the magnetic member.3. The magnetic sheet transport apparatus according to claim 2 , wherein the non-magnetic member has a thickness sufficient to separate the magnetic sheet from the magnetic member at a distance at which a density of the magnetic flux is less than 3 mT.4. The magnetic sheet transport apparatus according to claim 3 , wherein the thickness of the non-magnetic member is approximately 1 mm or more.5. The magnetic sheet transport apparatus according to claim 4 , wherein the thickness of the non-magnetic member is less than 4 mm.6. The magnetic sheet transport apparatus according to claim 4 , wherein the thickness of the non-magnetic member is less ...

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Номер записи: 91
04-12-2014 дата публикации

Apparatus and Method for Printing Maxels

Номер: US20140354382A1
Автор: Fullerton Larry W., Roberts Mark D.
Принадлежит:

Magnetic structure production may relate, by way of example but not limitation, to methods, systems, etc. for producing magnetic structures by printing magnetic pixels (aka maxels) into a magnetizable material. Disclosed herein is production of magnetic structures having, for example: maxels of varying shapes, maxels with different positioning, individual maxels with different properties, maxel patterns having different magnetic field characteristics, combinations thereof, and so forth. In certain example implementations disclosed herein, a second maxel may be printed such that it partially overwrites a first maxel to produce a magnetic structure having overlapping maxels. In certain example implementations disclosed herein, a magnetic printer may include a print head comprising multiple parts and having various properties. In certain example implementations disclosed herein, various techniques for using a magnetic printer may be employed to produce different magnetic structures. Furthermore, description of additional magnet-related technology and example implementations thereof is included herein. 1. An apparatus configured for printing maxels , the apparatus comprising:a first magnetic print head having a first hole;a second magnetic print head having a second hole;at least one first circuitry configured to position said first hole of said first magnetic print head adjacent to a first location on a first surface of a magnetizable material where a first maxel is to be printed and to position said second hole of said second magnetic print head adjacent to a second location on a second surface of said magnetizable material where a second maxel is to be printed, wherein said first surface is opposite said second surface on the magnetizable material; andat least one second circuitry configured to interact with said first magnetic print head to print said first maxel at said first location on the first surface of said magnetizable material and to interact with said ...

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Номер записи: 92
04-12-2014 дата публикации

Magnetizing Apparatus

Номер: US20140354383A1
Автор: Fullerton Larry W.
Принадлежит:

Magnetic structure production may relate, by way of example but not limitation, to methods, systems, etc. for producing magnetic structures by printing magnetic pixels (aka maxels) into a magnetizable material. Disclosed herein is production of magnetic structures having, for example: maxels of varying shapes, maxels with different positioning, individual maxels with different properties, maxel patterns having different magnetic field characteristics, combinations thereof, and so forth. In certain example implementations disclosed herein, a second maxel may be printed such that it partially overwrites a first maxel to produce a magnetic structure having overlapping maxels. In certain example implementations disclosed herein, a magnetic printer may include a print head comprising multiple parts and having various properties. In certain example implementations disclosed herein, various techniques for using a magnetic printer may be employed to produce different magnetic structures. Furthermore, description of additional magnet-related technology and example implementations thereof is included herein. 1. A magnetizing apparatus , comprising:an inductor coil having a hole;a circuitry configured for applying a current to said inductor coil to create a magnetic pulse having a sub-millisecond duration sufficient to produce a magnetic field source at a location on a surface of a magnetizable material comprising Neodymium, said magnetic field source having a magnetic field strength of at least 1500 Gauss as measured at said location on said surface of said magnetizable material.2. The apparatus of claim 1 , wherein said magnetic field source has a magnetic field strength of at least 2500 Gauss as measured at the surface of said magnetizable material.3. The apparatus of claim 1 , wherein said magnetic field source has a magnetic field strength of at least 3000 Gauss as measured at the surface of said magnetizable material.4. The apparatus of claim 1 , wherein said magnetic ...

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Номер записи: 93
13-09-2018 дата публикации

Demagnetization device and method for demagnetizing a transformer core

Номер: US20180261368A1
Автор: Ulrich Klapper
Принадлежит: OMICRON Electronics GmbH

In order to demagnetize a transformer core (13, 23) a demagnetization device (40) is detachably connected to a primary side (11) of a transformer (10, 20). An alternating signal is fed to the primary side (11) in order to demagnetize the transformer (10, 20).

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Номер записи: 94
22-09-2016 дата публикации

VARIABLE HARDNESS ACTUATOR

Номер: US20160276085A1
Автор: Kondo Yu, MATSUKI Kaoru
Принадлежит: OLYMPUS CORPORATION

A variable hardness actuator includes a flexible tubular member; plural particles of magnetic powder filling the tubular member; a coil wound around an outer circumference of the tubular member, surrounding the magnetic powder; a drive unit configured to supply electric current to the coil; and a directing unit used to give a direction to the drive unit to supply the electric current, wherein the coil generates a magnetic field using the electric current supplied from the drive unit in response to the direction from the directing unit, causing the plural particles of magnetic powder to magnetize spontaneously, magnetically couple together, and harden. 1. A variable hardness actuator comprising:a tubular member having flexibility;a plurality of magnetic bodies filling the tubular member;a coil wound around an outer circumference of the tubular member, surrounding the magnetic bodies;a drive unit configured to supply electric current to the coil; anda directing unit used to give a direction to the drive unit to supply the electric current, whereinthe coil generates a magnetic field using the electric current supplied from the drive unit in response to the direction from the directing unit, causing the plurality of magnetic bodies to magnetize spontaneously, magnetically couple together, and harden.2. The variable hardness actuator according to claim 1 , wherein:the drive unit is able to control an amount of the electric current supplied;the directing unit allows the amount of the electric current supplied by the drive unit to be specified; andhardness of the plurality of magnetic bodies is adjustable by controlling the amount of the electric current supplied to the coil.3. The variable hardness actuator according to claim 2 , wherein the magnetic bodies and the coil are placed in part of the tubular member in an axial direction.4. The variable hardness actuator according to claim 2 , wherein the magnetic bodies are magnetic powder.5. The variable hardness actuator ...

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Номер записи: 95
20-09-2018 дата публикации

PERMANENT MAGNET FOR ROTATING ELECTRICAL MACHINE, ROTATING ELECTRICAL MACHINE, METHOD FOR PRODUCING PERMANENT MAGNET FOR ROTATING ELECTRICAL MACHINE

Номер: US20180268976A1
Автор: Miyamoto Yasuhiro, YASUMURA Takaaki
Принадлежит: KABUSHIKI KAISHA YASKAWA DENKI

A permanent magnet for a rotating electrical machine includes a magnet body. The magnet body includes a magnetization direction, a first side surface and a second side surface opposite to the first side surface in a first direction perpendicular to the magnetization direction, and at least one first slit passing through the magnet body in the magnetization direction. The at least one first slit extends in the first direction to the first side surface and not to the second side surface. 1. A permanent magnet for a rotating electrical machine , comprising a magnetization direction;', 'a first side surface and a second side surface opposite to the first side surface in a first direction perpendicular to the magnetization direction; and', 'at least one first slit passing through the magnet body in the magnetization direction, the at least one first slit extending in the first direction to the first side surface and not to the second side surface., 'a magnet body comprising2. The permanent magnet according to claim 1 , whereinthe magnet body further comprises an at least one second slit passing through the magnet body in the magnetization direction, the at least one second slit extending in the first direction to the second side surface and not to the first side surface.3. The permanent magnet according to claim 2 ,wherein the at least one first slit and the at least one second slit are arranged in a second direction perpendicular to both the magnetization direction and the first direction.4. The permanent magnet according to claim 3 ,wherein a total of a length of the at least one first slit in the first direction and a length of the at least one second slit in the first direction is larger than a length of the magnet body in the first direction.5. The permanent magnet according to claim 1 , further comprising:a resin part filled in the at least one first slit.6. A rotating electrical machine comprising:a stator;a rotor to rotate around a rotation axis with respect to ...

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Номер записи: 96
28-09-2017 дата публикации

METHODS AND APPARATUS FOR MAGNETIC FIELD SHIMMING

Номер: US20170276747A1
Автор: Hugon Cedric, Poole Michael Stephen, Ralston Tyler S.
Принадлежит: Hyperfine Research, Inc.

According to some aspects, a method of producing a permanent magnet shim configured to improve a profile of a Bmagnetic field produced by a Bmagnet is provided. The method comprises determining deviation of the Bmagnetic field from a desired Bmagnetic field, determining a magnetic pattern that, when applied to magnetic material, produces a corrective magnetic field that corrects for at least some of the determined deviation, and applying the magnetic pattern to the magnetic material to produce the permanent magnet shim. According to some aspects, a permanent magnet shim for improving a profile of a Bmagnetic field produced by a Bmagnet is provided. The permanent magnet shim comprises magnetic material having a predetermined magnetic pattern applied thereto that produces a corrective magnetic field to improve the profile of the Bmagnetic field. 1. A low-field magnetic resonance imaging system comprising:{'sub': 0', '0, 'a Bmagnet configured to produce a Bmagnetic field at a field strength of less than or equal to approximately 0.2 T; and'}{'sub': '0', 'at least one permanent magnet shim comprising magnetic material having a predetermined magnetic pattern applied thereto that produces a corrective magnetic field to improve a profile of the Bmagnetic field.'}2. The low-field magnetic resonance imaging system of claim 1 , wherein the corrective magnetic field improves the profile of the Bmagnetic field by improving the homogeneity of the Bmagnetic field.3. The low-field magnetic resonance imaging system of claim 2 , wherein the corrective magnetic field improves the homogeneity of the Bmagnetic field by correcting for at least some non-uniformity resulting from manufacturing the Bmagnet.4. The low-field magnetic resonance imaging system of claim 2 , wherein the corrective magnetic field improves the homogeneity of the Bmagnetic field by correcting at least some non-uniformity inherent in or introduced by a design of the Bmagnet.5. The low-field magnetic resonance ...

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Номер записи: 97
18-12-2014 дата публикации

Magnetization Reversal

Номер: US20140368303A1
Автор: Barker Joseph, Chantrell Roy William, Evans Richard Francis Llewelyn, Kimel Alexey, Kirilyuk Andrei, Mentink Johan, Ostler Thomas Andrew, Rasing Theodorus Henricus Maria
Принадлежит:

A method of magnetization reversal, time stable ferrimagnetic material, a product and a domain comprising said material, a system for magnetization reversal, and information storage. Therein, a ferrimagnetic material is one in which magnetic moments of the atoms on different sublattices are opposed, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains. 1. A method of magnetization suitable for reversal in a multi component magnetic system , the system comprising at least a first magnetic sub system and a second magnetic sub system , the first and second sub systems being coupled anti-ferromagnetically , the method comprising the steps of:a) applying a stimulus to the magnetic system thereby reversing at least one magnetic moment of the first sub system, wherein the stimulus is an ultrafast heat pulse and is applied during a period in a first magnetization reversal time domain, andb) relaxing and thereby reversing at least one magnetic moment of the second sub system, during a period in a second magnetization reversal time domain,wherein the first magnetization reversal time domain is at most 100 times smaller than the second magnetization reversal time domain.2. The method according to claim 1 , wherein the magnetic system comprises at least two non-equivalent sub systems.3. The method according to claim 1 , wherein the stimulus is applied during a period shorter than a time of thermal equilibrium and/or wherein the stimulus is a heat pulse of less than 100 ps.4. The method according to claim 3 , wherein the heat pulse is a laser pulse claim 3 , wherein the wavelength of the laser pulse is from 100 nm-10000 nm.5. The method according to claim 1 , wherein an energy density of the stimulus is from 0.05-5 mJ/cmand/or wherein magnetization reversal is established in an area of the magnetic system having a cross-section of less than 250 nm.6. The method according to claim 1 , wherein the ...

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Номер записи: 98
28-09-2017 дата публикации

TEMPERATURE-BASED CONTROL OF INDUCTOR DEMAGNETIZATION

Номер: US20170278659A1
Автор: Buzzetti Siro, Demicheli Marco, Ranieri Danilo
Принадлежит:

An integrated circuit for demagnetizing an inductive load includes a first switch to control current supplied by a voltage supply to the inductive load. A Zener diode includes an anode connected to a control terminal of the first switch and a cathode connected to the voltage supply. A second switch includes a control terminal and first and second terminals. A temperature sensing circuit is configured to sense a temperature of the first switch and to generate a sensed temperature. A comparing circuit includes inputs that receive a reference temperature and the sensed temperature and an output connected to the control terminal of the second switch. 120-. (canceled)21. A discharge circuit for an inductive load , comprising:a clamp circuit connected between a first reference potential and an output node, wherein the inductive load is connected to the output node;a temperature sensing circuit to generate a sensed temperature signal based on a temperature of the clamp circuit; and a first switch connected between the output node and a second reference potential; and', 'a comparing circuit to selectively open and close the switch based on the sensed temperature signal., 'a first circuit including22. The discharge circuit of claim 21 , wherein the clamp circuit includes:a second switch having a first terminal connected to the first reference potential and a second terminal connected to the output node; anda Zener diode having an anode connected to the output node and a cathode connected to the first reference potential.23. The discharge circuit of claim 22 , wherein:the first switch comprises first and second transistors including (DMOS) field effect transistor (FETs); andthe second switch comprises a double-diffused metal oxide semiconductor DMOS FET.24. The discharge circuit of claim 22 , wherein the comparing circuit turns on the second switch when the sensed temperature signal is greater than a reference temperature signal and turns off the second switch when the sensed ...

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Номер записи: 99
28-09-2017 дата публикации

ORIENTATION MAGNETIZATION DEVICE AND MAGNET-EMBEDDED ROTOR

Номер: US20170279340A1
Автор: KANDA Naotake, Shibata Yoshiyuki, TACHI Koji, TAKEUCHI Taiki, Yoshikawa Hiroshi
Принадлежит: JTEKT CORPORATION

An orientation magnetization device includes plural orientation magnetization yokes and plural orientation magnetization magnets, and molds field magnets while a rotor core is disposed in a magnetic circuit that is formed by assembling the orientation magnetization yokes and the orientation magnetization magnets into an annular shape. When the rotor core is disposed in the magnetic circuit, protruding portions are disposed at portions of the respective orientation magnetization yokes facing the rotor core. Auxiliary magnets are disposed in gaps between the respective orientation magnetization magnets and the rotor core, on opposite sides of each protruding portion in a circumferential direction of the orientation magnetization device. Each protruding portion and each auxiliary magnet extend in an axial direction of the orientation magnetization device, and are skewed with respect to the axial direction of the orientation magnetization device. 1. An orientation magnetization device that stores a rotor core of a rotor configured to use resin magnets for field excitation and molds the resin magnets in a magnetic field , the orientation magnetization device comprising:a plurality of orientation magnetization yokes and a plurality of orientation magnetization magnets, the orientation magnetization yokes and the orientation magnetization magnets being assembled into an annular shape to form a magnetic circuit;wherein when the rotor core is disposed in the magnetic circuit such that an outer peripheral surface of the rotor core faces inner peripheral surfaces of the orientation magnetization yokes and the orientation magnetization magnets, protruding portions are disposed on the inner peripheral surfaces of the respective orientation magnetization yokes, the protruding portions protruding toward the rotor core with respect to the inner peripheral surfaces of the orientation magnetization magnets, and extending in an axial direction of the rotor core;high magnetic ...

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Номер записи: 100