CN109067024B - Large-torque micro-vibration magnetic suspension switched reluctance motor - Google Patents
Large-torque micro-vibration magnetic suspension switched reluctance motor Download PDFInfo
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- CN109067024B CN109067024B CN201810817739.XA CN201810817739A CN109067024B CN 109067024 B CN109067024 B CN 109067024B CN 201810817739 A CN201810817739 A CN 201810817739A CN 109067024 B CN109067024 B CN 109067024B
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- 239000000725 suspension Substances 0.000 title claims abstract description 39
- 238000004804 winding Methods 0.000 claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 5
- 238000005339 levitation Methods 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 238000004146 energy storage Methods 0.000 abstract description 5
- 230000005347 demagnetization Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 55
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Synchronous Machinery (AREA)
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Abstract
The invention discloses a large-torque micro-vibration magnetic suspension switched reluctance motor which comprises a stator, a first layer of stator teeth, a second layer of stator teeth, a first layer of rotor teeth, a second layer of rotor teeth, a rotor and a rotating shaft, wherein the first layer of stator teeth is arranged on the stator; the stator tooth pole windings are distributed according to the rule that the direction of a magnetic field generated by winding current is NNNSSS. 4 permanent magnets are embedded in the stator, so that the torque and the suspension force can be obviously increased, the temperature rise of the permanent magnets can be conveniently controlled, and the risk of demagnetization is reduced; the stator and the rotor both adopt a double-layer helical tooth pole structure, so that the vibration of the motor can be obviously reduced, the stable suspension of the rotor is facilitated, and the vibration noise is reduced. The motor has the advantages of simple structure, firm rotor, high speed, large torque, low noise, micro vibration, high efficiency, high power density, high reliability and the like, has high theoretical and practical value, and is suitable for the fields of turbomolecular pumps, high-speed machine tools, flywheel energy storage, aerospace and the like which have severe environments and require high precision and high reliability.
Description
Technical Field
The invention relates to a large-torque micro-vibration magnetic suspension switched reluctance motor which has the characteristics of large torque, low noise, small vibration and the like, can be used in occasions with high speed, high efficiency and high reliability, and is particularly suitable for the field of flywheel battery energy storage.
Background
Switched reluctance motors have attracted extensive attention in both the academic and industrial sectors due to the simple and robust advantages of their doubly salient structures, and their good operating characteristics under harsh operating conditions. With the development of the times, the switched reluctance motor has more and more important application value in the fields of turbo molecular pumps, high-speed machine tools, flywheel energy storage, aerospace and the like, so that the problems of mechanical abrasion, sharp loss, heating and the like of the high-speed or ultrahigh-speed motor supported by the traditional mechanical bearing are increasingly prominent, the service life of the motor is seriously influenced, and the maintenance cost is increased.
The reasonable method for solving the problems is to suspend the rotor by electromagnetic force, so that the magnetic suspension switched reluctance motor is produced. The magnetic suspension switched reluctance motor is developed at the end of the 20 th century, has the advantages of a magnetic bearing and a switched reluctance motor, and can utilize reluctance torque to the maximum extent. The salient pole type rotor magnetic suspension switched reluctance motor designed by A.Chiba et al in Japan has the advantages of simple structure, convenient maintenance, easy realization of high-speed or ultrahigh-speed operation and the like. However, the traditional magnetic suspension switched reluctance motor is lower than a permanent magnet motor in the aspects of torque, efficiency, power factor and the like, and has the problems of large vibration and large noise during running, so that the development and application of the traditional magnetic suspension switched reluctance motor in various fields are restricted.
The document with the chinese patent application number of CN201320829637.2 discloses a single-winding magnetic suspension switched reluctance motor, which overcomes the defect of difficult decoupling in control strategy and mathematical model caused by the strong coupling between the torque winding and the suspension winding of the traditional double-winding magnetic suspension switched reluctance motor. However, the magnetic suspension switched reluctance motor has a problem that the torque thereof is relatively low compared with the permanent magnet motor, and the vibration and noise thereof are large.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a large-torque micro-vibration magnetic suspension switched reluctance motor which is formed by injecting permanent magnets into a stator of the magnetic suspension switched reluctance motor and adopting double-layer stator and rotor helical tooth poles.
The technical scheme of the invention is as follows:
a large-torque micro-vibration magnetic suspension switched reluctance motor comprises a stator, a first layer of stator teeth, a second layer of stator teeth, a first layer of rotor teeth, a second layer of rotor teeth, a rotor and a rotating shaft; the inner circumferential surface of the stator is fixedly provided with two layers of 24 teeth poles in total, wherein 12 teeth poles form a first layer of stator teeth poles, and the other 12 teeth poles form a second layer of stator teeth poles; two layers of 16 teeth poles in total are fixedly arranged on the outer circumferential surface of the rotor, wherein 8 teeth poles form a first layer of rotor teeth poles, and the other 8 teeth poles form a second layer of rotor teeth poles; and all the tooth poles of the stator are wound with windings, and the windings are distributed according to the rule that the direction of a magnetic field generated by winding current is NNNSSS.
Furthermore, the large-torque micro-vibration magnetic suspension switched reluctance motor also comprises permanent magnets, wherein 4 permanent magnets are positioned between the second-phase stator tooth pole and the first-phase stator tooth pole and are uniformly distributed at intervals of 90 degrees; the adjacent permanent magnets are oppositely arranged in the same pole.
Further, the axial length of the permanent magnet is consistent with that of the stator; the radial width of the permanent magnet is smaller than that of the stator.
Further, the permanent magnet is made of ferrite or neodymium iron boron.
Further, the stator and the rotor are provided with double layers of helical tooth poles.
Furthermore, each layer of tooth poles of the stator and the rotor adopts the same deflection angle, no displacement angle exists between the first layer of stator tooth poles and the second layer of stator tooth poles, and no displacement angle exists between the first layer of rotor tooth poles and the second layer of rotor tooth poles, so that when the first layer of rotor tooth poles and the first layer of stator tooth poles are in aligned positions, the second layer of rotor tooth poles and the second layer of stator tooth poles which correspond up and down are also in aligned positions.
Furthermore, the permanent magnet is obliquely arranged, and the deflection angle of the permanent magnet is the same as that of the tooth pole.
After the technical scheme is adopted, the invention has the beneficial effects that:
the large-torque micro-vibration magnetic suspension switched reluctance motor has the advantages of simple structure, firm rotor, high power density, high efficiency and the like, and can be used in the fields of flywheel energy storage, various high-speed machine tool spindle motors and sealing pumps, centrifuges, compressors, high-speed micro hard disk drive devices and the like.
1. The advantages of compact structure, good fault-tolerant performance and good robust performance of the single-winding magnetic suspension switched reluctance motor are kept on the structure;
2. the permanent magnet is injected into the stator, so that the advantages of large torque, small loss, large power density and high efficiency of the permanent magnet motor are kept in performance, the temperature rise of the permanent magnet is convenient to control, the demagnetization is not easy to occur, and the service life is prolonged;
3. double-layer helical tooth poles are formed on the stator and the rotor, so that the inherent defects of large vibration and large noise of the switched reluctance motor are overcome, and the stability and reliability of system operation are improved; the two layers of tooth poles have the same shape and no displacement angle, the manufacturing difficulty is consistent with that of the single-layer helical tooth pole, but the capability of inhibiting vibration and noise is greatly superior to that of the single-layer helical tooth pole.
Drawings
Fig. 1 is a radial split view of a high-torque micro-vibration magnetic suspension switched reluctance motor.
Fig. 2 is an axial split view of a high-torque micro-vibration magnetic suspension switched reluctance motor.
Fig. 3 is a schematic diagram of electrical connection of windings of a high-torque micro-vibration magnetic levitation switched reluctance motor.
FIG. 4 is a schematic view of a radial subdivision of a stator part of a large-torque micro-vibration magnetic suspension switched reluctance motor.
Fig. 5 is a schematic view of a rotor of a high-torque micro-vibration magnetic suspension switched reluctance motor.
In the figure: 1. a stator; 2. a permanent magnet; 3. a first layer of stator teeth; 4. a second layer of stator teeth; 5. a first layer of rotor teeth; 6. a second layer of rotor teeth; 7. a rotor; 8. a rotating shaft; 9. a coil winding; 10. a photoelectric encoder; 11. an eddy current sensor; 12. a housing; 13. a self-aligning ball bearing; 14. an auxiliary bearing; 15. an internal thread cooling tube; 16. a left end cap; 17. and a right end cover.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1, the radial split view of the large-torque micro-vibration magnetic suspension switched reluctance motor of the present invention includes a stator 1, a permanent magnet 2, a first layer of stator teeth 3, a second layer of stator teeth 4, a first layer of rotor teeth 5, a second layer of rotor teeth 6, a rotor 7, and a rotating shaft 8. Two layers of 24 teeth poles are fixed on the inner circumferential surface of the stator 1, wherein 12 teeth poles form a first layer of stator teeth poles 3, and the other 12 teeth poles form a second layer of stator teeth poles 4; two layers of 16 teeth poles in total are fixed on the outer circumferential surface of the rotor 7, wherein 8 teeth poles form a first layer of rotor teeth poles 5, and the other 8 teeth poles form a second layer of rotor teeth poles 6; the 4 permanent magnets 2 are positioned between the second-phase stator tooth pole 4 and the first-phase stator tooth pole 3, the axial lengths of the permanent magnets are consistent with the axial length of the stator 1, and the permanent magnets are uniformly distributed at intervals of 90 degrees; the permanent magnet 2 is injected into the stator 1 and does not completely cut off the stator 1, namely the radial width of the permanent magnet 2 is smaller than that of the stator 1; two adjacent 4 permanent magnets 2 have opposite magnetic poles with the same polarity; the permanent magnet 2 is at the same angle of declination as the stator 1 and the rotor 7. The permanent magnet magnetic field and the electric excitation field are superposed, so that the air gap magnetic density is increased, and the torque and the levitation force are increased.
As shown in fig. 2, the large-torque micro-vibration magnetic suspension switched reluctance motor of the present invention is an axial split view, an air gap is provided between the inner wall of the stator and the outer wall of the rotor, and the thickness of the air gap is related to the power grade of the motor, the selected permanent magnet material, and the processing and assembling processes of the stator 1 and the rotor 7. The casing 12 is used for fixing the stator 1, the left end cover 16 and the right end cover 17, the left end cover 16 is used for fixing the self-aligning ball bearing 13, and the right end cover 17 is used for fixing the auxiliary bearing 14. The self-aligning ball bearing 13 makes one end of the motor rotating shaft fixed in the axial direction and flexibly move in two radial degrees of freedom, and the auxiliary bearing 14 is used for avoiding collision caused in the suspension or static process of the motor. The photoelectric encoder 10 and the eddy current sensor 11 are respectively installed at the left end and the right end of the rotating shaft 8 and used for detecting the rotating speed and the radial displacement of the motor.
As shown in fig. 3, the winding electrical connection schematic diagram of the large-torque micro-vibration magnetic suspension switched reluctance motor of the present invention is that a stator 1 is provided with two layers of teeth, namely a first layer stator tooth 3 and a second layer stator tooth 4, and there are 24 stator poles in total, each stator pole is provided with only one set of winding, and the windings are distributed according to the rule that the direction of a magnetic field generated by winding current is NNNSSS, so as to achieve the optimal distribution effect of the internal magnetic field of the motor. The 4 windings with 90 degrees interval form one phase, and A, B, C three phases are shared, wherein the A-phase winding is composed of A1, A2, A3 and A4 coils, the B-phase winding is composed of B1, B2, B3 and B4 coils, and the C-phase winding is composed of C1, C2, C3 and C4 coils. The 24 coils are wound on one stator pole each, and are distributed on the corresponding stator in the counterclockwise direction in the order of a1 → B1 → C1 → a2 → B2 → C2 → A3 → B3 → C3 → a4 → B4 → C4 coils.
As shown in fig. 4, a stator part of a large-torque micro-vibration magnetic suspension switched reluctance motor according to the present invention is shown as a schematic radially split view, and a stator 1 has double-layer helical teeth. The 24 teeth of the first layer of stator teeth 3 and the second layer of stator teeth 4 are all at the same deflection angle, and no displacement angle exists between the first layer of stator teeth 3 and the second layer of stator teeth 4.
As shown in fig. 5, a rotor part of a high-torque micro-vibration magnetic suspension switched reluctance motor according to the present invention is schematically illustrated, and the rotor 7 has double-layer skewed teeth. 16 teeth of the first layer of rotor teeth 5 and the second layer of rotor teeth 6 are all at the same deflection angle, and there is no displacement angle between the first layer of rotor teeth 5 and the second layer of rotor teeth 6, so that when the first layer of rotor teeth 5 and the first layer of stator teeth 3 are in the aligned position, the second layer of rotor teeth 6 and the second layer of stator teeth 4 corresponding to each other up and down are also in the aligned position, that is, the upper and lower four groups of stator teeth and rotor teeth in one phase are in the aligned position. The main sources of vibration and noise are that the radial component of torque force in the vicinity of an air gap between a stator and a rotor changes rapidly, and the torque force changes most intensely on a stator yoke in the vicinity of a rotor pole, so that sudden changes of the stator and the rotor can be relieved by inclining the stator and the rotor teeth, the stator and the rotor teeth can be distributed on the whole stator more, the peak value of the stator is reduced, and vibration suppression and noise reduction are realized.
In summary, the invention is a large-torque micro-vibration magnetic suspension switched reluctance motor designed on the basis of the traditional 12/8 single-winding magnetic suspension switched reluctance motor, which consists of a stator, a permanent magnet and a rotor. The 4 permanent magnets are embedded in the stator, so that the torque and the suspension force can be obviously increased, the temperature rise of the permanent magnets can be conveniently controlled, and the demagnetization risk is reduced; the stator and the rotor both adopt a double-layer helical tooth pole structure, so that the vibration of the motor can be obviously reduced, the stable suspension of the rotor is facilitated, and the vibration noise is reduced. The magnetic suspension switched reluctance motor has the advantages of simple structure, firm rotor, high speed, large torque, low noise, micro vibration, high efficiency, high power density and high reliability, has very high theoretical and practical values, and is suitable for the fields of severe environments, high precision and high reliability, such as a turbo molecular pump, a high-speed machine tool, flywheel energy storage, aerospace and the like.
The present invention can be realized in light of the above. Other variations and modifications which may occur to those skilled in the art without departing from the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A high-torque micro-vibration magnetic suspension switched reluctance motor is a single-winding magnetic suspension switched reluctance motor and is characterized by comprising a stator (1), a first layer of stator teeth (3), a second layer of stator teeth (4), a first layer of rotor teeth (5), a second layer of rotor teeth (6), a rotor (7) and a rotating shaft (8); the inner circumferential surface of the stator (1) is fixedly provided with two layers of 24 teeth poles in total, wherein 12 teeth poles form a first layer of stator teeth poles (3), and the other 12 teeth poles form a second layer of stator teeth poles (4); two layers of 16 teeth poles in total are fixedly arranged on the outer circumferential surface of the rotor (7), wherein 8 teeth poles form a first layer of rotor teeth poles (5), and the other 8 teeth poles form a second layer of rotor teeth poles (6); windings are wound on all tooth poles of the stator (1), and are distributed according to the rule that the direction of a magnetic field generated by winding current is NNNSSS; the permanent magnets (2) are 4, are positioned between the B-phase second-layer stator tooth pole (4) and the C-phase first-layer stator tooth pole (3), and are uniformly distributed at intervals of 90 degrees; the homopolar opposite arrangement of adjacent permanent magnet (2); the permanent magnet (2) is obliquely arranged, and the deflection angle of the permanent magnet is the same as that of the tooth pole; the stator (1) and the rotor (7) are both provided with double-layer helical tooth poles; the stator (1) and the rotor (7) are respectively provided with the same deflection angle at each layer of tooth poles, no displacement angle exists between the first layer of stator tooth poles (3) and the second layer of stator tooth poles (4), and no displacement angle exists between the first layer of rotor tooth poles (5) and the second layer of rotor tooth poles (6), so that when the first layer of rotor tooth poles (5) and the first layer of stator tooth poles (3) are in an aligned position, the second layer of rotor tooth poles (6) and the second layer of stator tooth poles (4) which correspond to each other up and down are also in an aligned position.
2. A high torque micro-vibrating magnetic levitation switched reluctance machine as claimed in claim 1, wherein the axial length of the permanent magnet (2) is identical to the axial length of the stator (1); the radial width of the permanent magnet (2) is smaller than that of the stator (1).
3. A high-torque micro-vibration magnetic suspension switched reluctance motor as claimed in claim 1, wherein said permanent magnet (2) is made of ferrite or neodymium iron boron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810817739.XA CN109067024B (en) | 2018-07-24 | 2018-07-24 | Large-torque micro-vibration magnetic suspension switched reluctance motor |
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| CN201810817739.XA CN109067024B (en) | 2018-07-24 | 2018-07-24 | Large-torque micro-vibration magnetic suspension switched reluctance motor |
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| CN109067024B true CN109067024B (en) | 2021-02-12 |
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| CN111852883B (en) * | 2019-04-29 | 2023-01-03 | 苏州苏磁智能科技有限公司 | High-efficiency magnetic coupling suspension pump |
| CN110829723A (en) * | 2019-10-25 | 2020-02-21 | 上海品星防爆电机有限公司 | Motor internal circulation heat dissipation method and structure thereof |
| CN112994279B (en) * | 2021-02-19 | 2022-02-11 | 杭州星成电气科技有限公司 | Switched reluctance motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202565044U (en) * | 2012-05-21 | 2012-11-28 | 南京信息工程大学 | Stator permanent magnet bearingless motor |
| GB2497667A (en) * | 2011-12-16 | 2013-06-19 | Samsung Electro Mech | A switch reluctance machine having a rotor acting as a fluid impeller |
| CN103647359A (en) * | 2013-12-13 | 2014-03-19 | 江苏大学 | Magnetic suspension switch magnetic resistance motor |
| CN106921277A (en) * | 2015-12-25 | 2017-07-04 | 郑州吉田专利运营有限公司 | Interior eight spirals mover bar |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218763B (en) * | 2014-07-08 | 2017-04-12 | 哈尔滨工业大学 | Multi-phase reluctance machine |
| CN106899183A (en) * | 2015-12-20 | 2017-06-27 | 郑州吉田专利运营有限公司 | The outer halbach array helical arrangement stator switch magnetic resistance motors of double straight-tooth |
| CN205647062U (en) * | 2016-05-30 | 2016-10-12 | 上海鼎特电器有限公司 | Motor core's structure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2497667A (en) * | 2011-12-16 | 2013-06-19 | Samsung Electro Mech | A switch reluctance machine having a rotor acting as a fluid impeller |
| CN202565044U (en) * | 2012-05-21 | 2012-11-28 | 南京信息工程大学 | Stator permanent magnet bearingless motor |
| CN103647359A (en) * | 2013-12-13 | 2014-03-19 | 江苏大学 | Magnetic suspension switch magnetic resistance motor |
| CN106921277A (en) * | 2015-12-25 | 2017-07-04 | 郑州吉田专利运营有限公司 | Interior eight spirals mover bar |
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