基于力控制的磁悬浮硬盘驱动器

... 基于力控制的磁悬浮硬盘驱动器，涉及一种硬盘驱动器。它由盘片、磁悬浮转子、力传感器、A/D、DSP、D/A及功率放大器构成。磁悬浮转子由主轴及其外套的内、外磁环、定子铁芯及其外绕的线圈构成。定子铁芯外套有力传感器，该力传感器可测量三维空间的6个分力。本发明用磁悬浮技术将硬盘转子完全悬浮起来，以磁力轴承取代传统的轴承。利用传感器测量出的三维空间的6个分力的电压信号，转换成控制信号，再经功率放大后转换成电流信号，电流在电磁铁中产生磁力，使磁悬浮转子随时处于悬浮平衡状态。本发明能大大减少传感器所占的空间，有利于研究和解决磁悬浮系统中存在的各种耦合问题。本发明同时适用于光盘驱动器或其他类似的驱动器。 ...

Spinning rotor bearing

The invention provides a novel spinning rotor bearing, including a rotor bearing part and a magnetic suspension part which form the spinning rotor bearing with the characteristics of magnetic force unloading and shock-absorbing; the magnetic suspension part mainly comprises two end magnetic sheets (5), a middle magnetic sheet (7) and two magnetic sheets (8) made of Nd-Fe-B, and is contactly arranged according to the interphase sequence of end magnetic sheet, magnetic sheet, middle magnetic sheet, magnetic sheet, end magnetic sheet, which are clamped by rivets (11). The magnetic sheets charge magnetism along the axial direction, the two magnetic sheets (8) are arranged according to the magnetic pole sequence of NSSN or SNNS; a flux sleeve (10) forms tiny clearance with the three magnetic sheets; in this way, the middle magnetic sheet is a public magnetic pole and the two end magnetic sheets are individual magnetic poles, which form two closed magnetic circuits with the flux sleeve and the ...

Reversing differential driven magnetic bearing

The invention provides two magnetic bearings controlled by reverse differential driving. Each magnetic bearing comprises a stator, a rotor, a sensor, a controller and power amplifiers. A group of large turn windings and a group of small turn windings are wound on two opposite electromagnets in the freedom degree direction restrained by the magnetic bearings respectively, and the winding directions of the two groups of windings are opposite, wherein the large turn windings of the first magnetic bearing are connected in series with the small turn windings on the electromagnets in the opposite directions respectively, and driven by the same power amplifier. The two opposite electromagnets are excited by control current with equal intensity and opposite directions. The large turn windings andthe small turn windings of the second magnetic bearing are driven by two power amplifiers respectively, the large turn windings of the two opposite electromagnets are still excited by the control current ...

Hydraulic cylinder lightweight piston rod with composite structure and preparation method thereof

The invention relates to a hydraulic cylinder lightweight piston rod with a composite structure and a preparation method thereof. The piston rod comprises a rod head (1), flange bushings (2), a carbon fiber composite rod body inner layer (3), a rod body outer lining (4) and a shaft head (5), the flange bushings (2) are pre-buried at the two ends of the carbon fiber composite rod body inner layer (3) and integrally cured and formed along with the carbon fiber composite rod body inner layer (3), and the rod body outer lining (4) is fixedly arranged on the carbon fiber composite rod body inner layer (3) in a sleeving mode. And the rod head (1) and the shaft head (5) are fixed on the flange bushings (2) at the two ends of the carbon fiber composite rod body inner layer (3) through threads. An inverted pulling structure and an annular groove are arranged at the corresponding positions of the flange lining (2) to prevent the flange lining (2) from falling off together. Compared with an existing ...

Ribbed woven winding carbon fiber composite transmission shaft

The invention relates to a ribbed woven winding carbon fiber composite transmission shaft, which comprises a transmission shaft body (1) and metal flanges (2) connected with two ends of the transmission shaft body, wherein the transmission shaft body (1) is tubular and is formed by winding a carbon fiber composite, and the metal flanges (2) are arranged on two ends of the transmission shaft body. According to the carbon fiber composite transmission shaft, the contact area between the metal flanges and carbon fibers can be increased through ribs on the metal flanges, the strength of the carbon fibers can be fully utilized by utilizing weaving and winding methods, and the interlaminar shear strength and connection strength at the connection position of the transmission shaft body and the metal flanges is improved, so that torque can be stably transmitted. The connection reliability of the carbon fiber composite transmission shaft can be enhanced. The application fields of the carbon fiber ...

Surfing machine

The invention provides a surfing machine for simulating surfing sport, which includes a supporting frame equipped with an armrest and a device for simulating surfing motion, wherein the device comprises a surf-board, a chassis and a cone connected in turn from up to down, a ball hinge is arranged between the inner cavity of an angle adjusting disc and a support stand, the bottom end of the cone is connected with the ball hinge through a bolt, the angle adjusting disc is connected with the support stand through screwed joint, the support stand is connected with the baseboard to form the foundation for the device.

Magnetic suspension method and device

欠传感器磁悬浮转子系统

... 本发明涉及一种磁悬浮转子系统。欠传感器磁悬浮转子系统，包括转子(9)、电机转子(8)、壳体(7)、电机定子(6)、A/D、DSP、D/A及其功率放大器，其特征在于转子(9)外套有2个锥盘(10)，2个锥度磁力轴承定子(4)分别位于转子(9)上方和下方；传感器支架(11)位于2个锥度磁力轴承定子(4)之间，传感器支架(11)上装有4个传感器(5)，锥盘(10)与锥度磁力轴承定子(4)组成磁力轴承副。本发明能减少传感器所占的空间，特别适合磁悬浮硬盘驱动器、磁悬浮光盘驱动器等径向尺寸较大，轴向尺寸较小的磁悬浮转子应用场合，能在较小的轴向尺寸内实现了转子的磁悬浮。本发明同时适用于其它空间结构紧凑的微小磁悬浮转子系统。 ...

Stereo garage

This invention relates to a stereo-garage including a winding engine, a frame, a jiffy stand, a lifting platform, and an access device including an access device and an inter locking unit in which, the access unit has a car-carry plate and a drive unit, every jiffy stand holds a car-carry plate with track, a stopper and a fork at the back, the driving unit is set with a motor, a can mounted between duplex chain and a driving pin of the car-carry plate, the interlocking unit is set with a safety pin, a swing rod and a driving unit, the swing rod is hinged to a stand on the jiffy stand. The driving unit includes a motor, a slide pin, a gear and rakc bar.

Small magnetic suspension horizontal shaft wind power generator

The invention relates to a small magnetic suspension horizontal shaft wind power generator which comprises a rotating shaft, a stator and a rotor, wherein one end of the rotating shaft (2) is supported by adopting a rolling bearing (13), and the other end is supported by adopting a permanent magnet bearing and provided with a paddle; and the stator and the rotor are distributed between the permanent magnet bearing and the rolling bearing. A magnetic suspension support technology is applied to the traditional small wind power generator, and therefore, the invention has the advantages of small start resisting moment, simple structure, low cost, low-wind speed start, easy assembly, and the like.

Composite-material propeller

The invention discloses a composite-material propeller, which structurally comprises a propeller hub and a plurality of blades, wherein the propeller hub is a part for connecting the blades with a transmission shaft of the propeller; the roots of the blades are connected with the outer wall of the propeller hub in an arc fit way or a planar fit way, and are fixedly positioned in an adhesion way or a dowel or screw connecting way, so that requirements on the positions of the blades and the propeller hub are met. According to the composite-material propeller, the problems of structural design of the composite-material propeller are solved, the weight of the propeller is reduced by over 50 percent, the torque reaches 24,000N.m, and the vibration and the noise of the propeller are reduced.

Reversing differential driven magnetic bearing

The invention provides two magnetic bearings controlled by reverse differential driving. Each magnetic bearing comprises a stator, a rotor, a sensor, a controller and power amplifiers. A group of large turn windings and a group of small turn windings are wound on two opposite electromagnets in the freedom degree direction restrained by the magnetic bearings respectively, and the winding directions of the two groups of windings are opposite, wherein the large turn windings of the first magnetic bearing are connected in series with the small turn windings on the electromagnets in the opposite directions respectively, and driven by the same power amplifier. The two opposite electromagnets are excited by control current with equal intensity and opposite directions. The large turn windings and the small turn windings of the second magnetic bearing are driven by two power amplifiers respectively, the large turn windings of the two opposite electromagnets are still excited by the control current ...

Circular desktop type skiing machine

A sking simulator as an entertainment appliance is composed of a skiing simulating mechanism consisting of circular tablet type supporter and left and right pedals, a base, and a pair of handles. Said circular tablet type supporter has an axle rod which is pivoted to said base and is on the axis of theoretical aircular tablet. Said left and right pedals are positioned on the generating line of theoretical circular tablet.

带防静电结构设计的磁悬浮硬盘驱动器

... 带防静电结构设计的磁悬浮硬盘驱动器，涉及一项磁悬浮硬盘驱动器的防静电技术。磁悬浮硬盘驱动器由磁悬浮转子、位移传感器、A/D、DSP、D/A及功率放大器构成。本发明采用磁悬浮技术将硬盘转子完全悬浮起来，以磁力轴承取代传统的轴承，主轴有中心孔，中心孔内有油楔槽，并装有导电液；静电释放针一端与磁悬浮转子固定连接，另一端悬空地浸在导电液里，形成磁悬浮转子与地线间的静电释放通道，并且不影响磁悬浮转子的悬浮状态。盘片高速旋转时，因油楔槽的存在产生动压油膜，使静电释放针的中心稳定。本发明能安全有效地释放磁悬浮硬盘驱动器系统中因盘片高速旋转与空气摩擦所产生的静电，避免静电干扰磁悬浮硬盘的数据读、写工作。 ...

Undersensor magnetic suspension rotor system

The invention refers to an undersensor magnetic suspended rotor system, including the rotor, the electric machine rotor, the shell, the electric machine stator, A/D, DSP, D/A and the power amplifier.Its character: the coat of the rotor has two awl-shaped trays, two taper magnetic force bearing stators respectively are lied above and below the rotor; there are 4 sensors installed on the bracket of the sensor, and the awl-shaped tray and the taper magnetic force bearing stator compose the magnetic force bearing pair. It is also applied to other small magnetic suspended rotor systems with compact space construction.

Magnetic field coupling-eliminating magnetic bearing and manufacturing method thereof

The invention relates to a magnetic bearing used for eliminating magnetic field coupling. The magnetic bearing consists of four magnet cores (1), four coils (7), two magnet isolating rings (5) and four rivets (4). The two magnet isolating rings are matched with the outer circles of the magnet cores by spigots of the magnet isolating rings and are respectively arranged at two sides of the magnet cores to clamp the magnet cores. The magnet isolating rings and the magnet cores are riveted as a whole by the rivets (4). The four magnet cores are respectively winded with a coil (7) to form the whole magnetic bearing. The four magnet cores of the magnetic bearing consist of a plurality of silicon steel sheets which are coincided and are all structured as character E, both two ends of each silicon steel sheet are provided with semicircular slots (2), and the rivets (4) restrain the circumferential position between each silicon steel sheet by the semicircular slots. The magnetic bearing adopts four ...

A magnetic suspending flying wheel battery

This invention provides a magnetic suspension flywheel cell including an energy storage and transform part and a support part, in which, the storage and transform part includes a flywheel, rotor of a motor or a generator and a stator of a motor or a gnerator, the support part includes electromagnets, shift sensors, an axial protection bearing and a radial protection bearing, and the flywheel is linked with the rotor, the stator is fixed on the shell, at least three electromagnets and three shift sensors are installed on an inverted round table-board of a pallet staggered uniformly along the circle direction, and the top of the flywheel is in an inverted round table and the flywheel is magnetic-suspended under the pallet to be non-contacted with spare parts around it.

Large-air gap mixed magnetic bearing performance testing device

The invention provides a large-air gap mixed magnetic bearing performance testing device, sequentially consisting of a drive system, a large-air gap mixed magnetic bearing system, a measuring system and a loading system which are connected in a mechanical way, wherein the drive system comprises a motor (1) and a coupler (2); the large-air gap mixed magnetic bearing system comprises a large-air gap mixed magnetic bearing (3) and a pedestal (4); the measuring system comprises a rotating main shaft (5) and a displacement sensor (6); the loading system comprises a dynamic balance disc (7) and a weight loading device (8); from left to right, the motor (1), the pedestal (4) and a loading support (16) are fixed on a pedestal platform (9) by bolts in sequence. The device can be used for measuring and testing the large-air gap mixed magnetic bearing under static and dynamic states, and an experiment basic is provided for the design optimization of the large-air gap mixed magnetic bearing.

Hydraulic cylinder of carbon fiber composite material

The invention discloses a hydraulic cylinder of a carbon fiber composite material. A cylinder body (2) is made of a high-strength carbon fiber precursor of which the strength is greater than or equal to 3500MPa as a reinforcing material and thermosetting resin as a substrate by adopting a technology of winding and molding carbon fiber into a carbon fiber composite material layer; a cylinder bottom (1), a piston (6) and a cylinder cover (10) are made of a high-strength aluminum alloy of which the strength is greater than or equal to 500MPa; a piston rod (9) is made of hard chromium-plated steel. Compared with a common hydraulic cylinder made of metal, the hydraulic cylinder has the significant advantage of weight reduction, and the weight-carrying capacity is obviously superior to that of an existing common hydraulic cylinder made of metal. Therefore, the hydraulic cylinder has a good application prospect in hydraulic drive and hydraulic control equipment in which water is used as a fluid ...

DPS based intellectual high speed magnetic suspension control and analog power amplifying device

基于虚拟仪器技术的多传感器噪声和振动测量分析仪

An instrument based on virtual instrument technique for measuring and analyzing the noise of multiple sensors including mois sensor, vibration sensor, and rotation speed sensor is composed of sensors, front-end processor with analog input, and PC with measuring software module for analyzing digital signals. Its advantages are high measuring precision, and high resolution.

Magnetic suspension hard disk single free degree property experiment platform

The invention refers to a magnetic suspension hard disk single free degree performance experiment table, it includes controlling part, and this part is made up of displacement sensor, A/D, DSP, D/A, and the power amplifier, its character is that the testing mechanism aprt contains central shaft, magnetism device and controlling part; the magnetism may be permanent magnet or electrical magnet or all of them, the magnetism devices are at the outside of the central shaft; the power amplifier connects with the stator coil of testing mechanism part, the control system measures the displacement of the rotor through the displacement sensor, the displacement sensor turns the displacement signal into voltage signal, the voltage signal feedbacks to the controllers, the controller sends out control signal.

Fault monitoring method, device and equipment for coal mill pull rod and storage medium

The invention relates to a coal mill pull rod fault monitoring method and device, equipment and a storage medium. The method comprises the steps that a coal mill simulation model is established according to an actual coal mill, the coal mill simulation model is operated, and the installation position of a strain sensor is determined according to simulation data; actual pull rod strain data of the coal mill are collected in real time through the strain sensor, and the pull rod strain data are preprocessed; and when the pre-processed pull rod strain data reaches a preset alarm threshold value within a first preset time, sending out a pull rod fault early warning signal. According to the fault monitoring method, device and equipment for the pull rod of the coal mill and the storage medium, the position where the pull rod is prone to fracture is determined by establishing the coal mill simulation model, the strain data of the pull rod at the position are collected, preprocessing and fault monitoring ...

Hemp scraping device

The invention relates to a hemp scraping device which comprises a rack, a driving structure and a plurality of groups of scraper structures, a material guide plate and a rotating part are arranged on the rack, and the rotating part can rotate around the axial direction of the rotating part; the multiple sets of scraper structures are arranged on the rotating part, arranged in the circumferential direction of the rotating part at intervals and located on one side of the material guiding plate so that a material guiding gap can be formed between the scraper structures and the material guiding plate, the material guiding gap is provided with a feeding end and a discharging end which are located in the circumferential direction of the rotating part, all the scraper structures can rotate in the axial direction of the scraper structures, and the axial direction of the scraper structures is the same as the axial direction of the rotating part. Each scraper structure is provided with a plurality ...

Multiple sensor noise and vibration measuring analyzer based on virtual apparatus technology

A magnetic suspending flying wheel battery

This invention provides a magnetic suspension flywheel cell including an energy storage and transform part and a support part, in which, the storage and transform part includes a flywheel, rotor of a motor or a generator and a stator of a motor or a gnerator, the support part includes electromagnets, shift sensors, an axial protection bearing and a radial protection bearing, and the flywheel is linked with the rotor, the stator is fixed on the shell, at least three electromagnets and three shift sensors are installed on an inverted round table-board of a pallet staggered uniformly along the circle direction, and the top of the flywheel is in an inverted round table and the flywheel is magnetic-suspended under the pallet to be non-contacted with spare parts around it.

Small magnetic suspension horizontal shaft wind power generator

The invention relates to a small magnetic suspension horizontal shaft wind power generator which comprises a rotating shaft, a stator and a rotor, wherein one end of the rotating shaft (2) is supported by adopting a rolling bearing (13), and the other end is supported by adopting a permanent magnet bearing and provided with a paddle; and the stator and the rotor are distributed between the permanent magnet bearing and the rolling bearing. A magnetic suspension support technology is applied to the traditional small wind power generator, and therefore, the invention has the advantages of small start resisting moment, simple structure, low cost, low-wind speed start, easy assembly, and the like.

Magnetic bearing electromagnetic force sensing device based on optical fiber grating and on-line measurement system

The invention relates to an optical fiber grating magnetic force bearing electromagnetic force sensing device and an online measuring system, belonging to the optical fiber grating magnetic force sensing technical field, wherein the device comprises an L-shaped magnetic elastic unit 1 and an optical fiber grating 2 enclosed in the elastic unit groove, a magnetic force bearing stator 4, a magnetic force bearing rotor 5. The convex part of the L-shaped magnetic elastic unit is spliced in the groove at the bottom of the magnetic force bearing stator 4, and the other part is suspended in the air gap to form the cantilever structure. When in measurement, the wideband light source transmits the light with certain bandwidth and the conversion part into the optical fiber grating magnetic force sensing device through the light transmission, wherein the optical fiber grating 2 in the device generates the wavelength excursion due to the strain, according to the wavelength selection of the optical ...

Differential magnetic suspension vibration isolator

The invention discloses a differential magnetic suspension vibration isolator which comprises an upper annular E-shaped electromagnet (15), a lower annular E-shaped electromagnet (11), an upper coil winding (8), a lower coil winding (10), a displacement sensor (1), a connecting flange plate (3), an adjusting nut (4), a spring (6), a linear bearing (7) and an armature (9). The upper annular E-shaped electromagnet (15) and the lower annular E-shaped electromagnet (11) are fixed onto a shell (14) and a base (12) respectively, the upper coil winding (8) and the lower coil winding (10) are fixed onto the upper annular E-shaped electromagnet (15) and the lower annular E-shaped electromagnet (11) respectively, the displacement sensor (1) is fixed onto the shell (14) through a support (16), the connecting flange plate (3), the adjusting nut (4), the spring (6), the linear bearing (7) and the armature (9) are sequentially connected in series from top to bottom through connecting rods (5), the shell ...

Method, device and equipment for evaluating health state of coal mill and storage medium

The invention relates to a coal mill health state assessment method and device, equipment and a storage medium. The method comprises the steps that an initial dynamic model of a coal mill is established; based on a preset method, parameters of the initial dynamic model of the coal mill are determined according to historical operation data of the coal mill, and a target dynamic model of the coal mill is obtained; inputting a coal mill operation data sequence into the coal mill target dynamic model, and determining a coal mill health index initial value according to an output result; and optimizing the initial value of the health index of the coal mill according to the running data of the main measuring point of the coal mill to obtain a final value of the health index. According to the coal mill health state assessment method, device and equipment and the storage medium, the coal mill operation data sequence is input into the coal mill target dynamic model, the coal mill health index final ...

Antistatic technique for magnetically floating hard disk drive

The invention relates to a technique for anti-static electricity of magnetic-suspension hard disk drive. The drive consists of magnetic-suspension rotor, displacement sensor, A/D, DSP, A/D and power amplifier. The rotor of hard disk drive is totally magnetic-suspended. magnetic bearing replaces the traditional bearing. There is a central hole on the principal axis, and there is an oil-wedge groove containing oil in the central hole. On end of needle for releasing static electricity is fixed on the magnetic-suspension rotor, and the other end is hung and immersed in a conduction liquid, forming a channel for releasing static electricity between the rotor and ground wire. The invention can safety release the static electricity caused by air friction, and the said needle does not affect the operation of the rotor and works stable so as to prevent the hard disk from interference of static electricity.

Mangetically suspended fixed disk drive based on force control

There is a MAGLE hard disk driver based on force control, which referse to a kind of hard disk driver. It is made up of disc, MAGLE rotor, force sensor, A/D, DSP, D/A and power amplifier. The MAGLE rotor consists of principal axis and its inner and outer magnetic ring, statoriron core and its outer winding. The wrap of the statoriron core has a force sensor which can measure 6 components of forces of 3D space. The invention applies MAGLE technology to completely suspended the hard disk rotor and replaces traditional bearing with magnetic force one. The voltage signal of 6 components of forcesof 3D space by sensor measuring is converted into control signal, and then after power amplified it is converted into current signal, so the current produces magnetic force inside the electromagneticto make the MAGLE rotor in the state of suspended balance at any moment.

Maglev galloping train device

The invention provides a maglev galloping train device. In the invention, the train body of a galloping train is suspended on an overhead track by using the maglev technology, the galloping train is driven to run along the track by air flow generated by a propeller-powered thruster on the galloping train, and the galloping train is composed of a maglev system and the propeller-powered thruster. Because the galloping train is suspended in the air and has no friction with the track, the power loss caused by friction can be avoided, thereby making the high-speed running of the galloping train possible. The maglev galloping train device provided by the invention can become a transportation facility with a totally new concept and a new carrying mode and has the advantages of novel principle, simple structure and the like.

Air spring-magnetic suspension combined vibration isolator

The invention discloses an air spring-magnetic suspension combined vibration isolator. The combined vibration isolator comprises air springs (17), a magnetic suspension vibration isolator body (18) and a connecting component (19). The magnetic suspension vibration isolator body (18) is arranged between inner bag bodies (7) of the air springs (17). The connecting component (19) comprises a thrust disc (4), a pressing plate (5) and balls (3) with a holder, wherein the balls (3) with the holder are arranged on the thrust disc (4) in the vertical direction. The thrust disc (4) and the pressing plate (5) are connected with a connecting rod (1) of the magnetic suspension vibration isolator body (18) and an upper cover plate (8) of the air springs (17). The air spring-magnetic suspension combined vibration isolator has the advantages of being wide in working band, high in reliability, compact in structure, high in bearing capacity, convenient to maintain and the like and has great application ...

Spinning rotor bearing

Double elliptic motion exercising equipment

A dual-elliptical setting-up machine for the simulation of ski, stepping-up, slow running and pedaling bicycle is composed of base, two fixed handrails, two crank-rocker mechanisms, damping regulator, pedals, vertical frame, and two damping blocks.

Washer for automobile head light

The washer for automobile head light consists of a nozzle assembly, a piston, a spring, a base, a water inlet, and a cylinder mainly. The base with ring groove and the cylinder with inlet and outlet constitute one flow channel, the piston with guide hole to the inner cavity is provided with sealing ring and end cap to the tail, the nozzle assembly consists of a spray head, a guide cone and a nozzle and is communicated with the piston cavity, and all the said parts constitute one passage for the cleaning liquid. The present invention has excellent cleaning effect, simple structure, low cost and other advantages.

Method for testing coupling property of magnetic suspension rotor system and test platform

Structure for connecting carbon fiber composite shaft and metal shaft

The invention discloses a structure for connecting a carbon fiber composite shaft and a metal shaft. The structure is structurally characterized by consisting of polygonal metal ends (1) and a carbon fiber composite shaft (2), wherein two ends of the carbon fiber composite shaft are respectively formed in the shape of a polygon consistent with the end shape of the polygonal metal end in a way of twining and the like; two ends of the carbon fiber composite shaft are respectively connected with the end parts of the polygonal metal ends in a bonding way; alternately, the structure consists of the polygonal metal ends (1), a metal internal layer (3) and a carbon fiber pipe (4); the end parts of the polygonal metal ends are respectively connected with polygonal holes in the interior of the metal internal layer in a sheathing way; the carbon fiber pipe is twined on the external surface of the metal internal layer, and fixed in a resin connection way. According to the structure, the defect of ...

Integrated magnetic suspension rotor dynamic displacement measuring device

Combined type magnetic suspension hard disk driver

The invention provides a combined type magnetic suspension hard disk driver comprising a disc motor, hard discs, a rotation shaft and its support and control device, a displacement transducer for measuring hard disc space attitude, and antistatic structure composed of conductive liquid and conductive pins.

Magnetic bearing electromagnetic force sensing device based on optical fiber grating and on-line measurement system

The invention relates to an optical fiber grating magnetic force bearing electromagnetic force sensing device and an online measuring system, belonging to the optical fiber grating magnetic force sensing technical field, wherein the device comprises an L-shaped magnetic elastic unit 1 and an optical fiber grating 2 enclosed in the elastic unit groove, a magnetic force bearing stator 4, a magneticforce bearing rotor 5. The convex part of the L-shaped magnetic elastic unit is spliced in the groove at the bottom of the magnetic force bearing stator 4, and the other part is suspended in the air gap to form the cantilever structure. When in measurement, the wideband light source transmits the light with certain bandwidth and the conversion part into the optical fiber grating magnetic force sensing device through the light transmission, wherein the optical fiber grating 2 in the device generates the wavelength excursion due to the strain, according to the wavelength selection of the optical fiber ...