CN110601477A - Radial magnetic field composite motor - Google Patents
Radial magnetic field composite motor Download PDFInfo
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- CN110601477A CN110601477A CN201910873710.8A CN201910873710A CN110601477A CN 110601477 A CN110601477 A CN 110601477A CN 201910873710 A CN201910873710 A CN 201910873710A CN 110601477 A CN110601477 A CN 110601477A
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- rotor
- stator
- motor
- rotating shaft
- salient pole
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- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 230000005389 magnetism Effects 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims description 47
- 230000005284 excitation Effects 0.000 claims description 22
- 241001611138 Isma Species 0.000 claims description 2
- 101100522751 Xenorhabdus nematophila (strain ATCC 19061 / DSM 3370 / CCUG 14189 / LMG 1036 / NCIMB 9965 / AN6) pvcA gene Proteins 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000005347 demagnetization Effects 0.000 abstract description 6
- 230000002427 irreversible effect Effects 0.000 abstract description 6
- 230000004907 flux Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- H02K16/00—Machines with more than one rotor or stator
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Synchronous Machinery (AREA)
Abstract
The invention relates to the field of motor design and discloses a radial magnetic field composite motor which comprises a rotating shaft, a first bearing, an inner stator, an inner rotor, a magnetism isolating ring, an outer rotor and an outer stator, wherein the first bearing surrounds the rotating shaft; air gaps are arranged between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner stator is rotationally connected with the rotating shaft through a first bearing, and the outer rotor is fixedly connected with the inner rotor through a magnetism isolating ring; the outer rotor, the magnetism isolating ring and the inner rotor form a motor rotor and are fixedly connected with the rotating shaft through a rotor support, and the outer stator is fixed on the shell and is rotatably connected with the rotating shaft. The invention meets the requirements of low-speed large-torque and wide speed regulation range operation of the driving motor on the premise of improving the operation reliability of the permanent magnet and avoiding irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation and high temperature.
Description
Technical Field
The invention relates to the field of motor design, in particular to a radial magnetic field composite motor.
Background
High torque density, low speed, high torque and wide speed range are performance requirements for drive motors, especially direct drive motors. The widely applied switched reluctance motor has a wider speed regulation range, a simple structure, no permanent magnet on the stator and the rotor, high working reliability, and obviously lower torque density than a permanent magnet motor. In the structure of the motor, permanent magnets and windings are arranged on the stator, the rotor structure is simple, and the reliability and the dynamic running performance of the motor are improved. However, due to the inherent characteristics of the permanent magnet, the air gap field of the stator permanent magnet motor is kept constant basically during operation, and during electric operation, the motor is difficult to control in excitation and limited in speed regulation range. The students mostly adopt a mixed excitation mode to increase the speed regulation range of the stator permanent magnet motor, and the stator is provided with an excitation winding besides a permanent magnet, so that the double excitation source mixed excitation mode is realized, the magnetic field regulation capacity can be improved, and the rotating speed operation range is widened. However, the high-speed weak-magnetic speed regulation in the speed regulation process of the motor can reduce the working performance of the permanent magnet, and can cause irreversible demagnetization of the permanent magnet when the working performance is serious. In addition, the stator in the mixed excitation stator permanent magnet motor structure has the permanent magnet and two sets of windings (excitation winding and armature winding) at the same time, on one hand, the magnetic circuit saturation degree is high, on the other hand, the placing space of the armature winding is restrained, the torque output capacity is limited to a certain degree, and because the heat sources are all positioned in the stator, the temperature rise of the stator winding and the permanent magnet is easily caused to be too high, and the insulation damage of the winding and the irreversible demagnetization of the permanent magnet are brought.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a radial magnetic field composite motor which meets the requirements of low-speed high-torque and wide speed regulation range operation of a driving motor on the premise of improving the operation reliability of a permanent magnet and avoiding irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation.
The technical scheme is as follows: the invention provides a radial magnetic field composite motor which comprises a rotating shaft, a first bearing surrounding the rotating shaft, an inner stator surrounding the first bearing, an inner rotor surrounding the inner stator, a magnetism isolating ring surrounding the inner rotor, an outer rotor surrounding the magnetism isolating ring, and an outer stator surrounding the outer rotor, wherein the first bearing is arranged on the inner side of the rotating shaft; air gaps are arranged between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner stator is rotationally connected with the rotating shaft through the first bearing, and the outer rotor is fixedly connected with the inner rotor through the magnetism isolating ring; the outer rotor, the magnetism isolating ring and the inner rotor form a motor rotor and are fixedly connected with the rotating shaft through a rotor support, and the outer stator is fixed on the shell and is rotatably connected with the rotating shaft.
Furthermore, salient pole teeth are arranged on the opposite sides of the outer stator and the outer rotor and the opposite sides of the inner stator and the inner rotor, an outer side winding is arranged on the salient pole teeth of the outer stator, and an inner side winding and an excitation device are arranged on the salient pole teeth of the inner stator.
Preferably, the magnetizing direction of the exciting device is alternately magnetizing along the circumferential direction of the inner stator.
Preferably, the excitation device is a permanent magnet or a hybrid excitation device. When the hybrid excitation device is adopted, the electric excitation source is only used for low-speed magnetization to increase the output torque capacity, and a high-speed weak magnetic working mode is absent.
Preferably, the number of salient pole teeth of the outer stator isP soThe outer windings being formed by symmetrically distributed windingsP soA coil sleeved on the salient pole teeth of the outer stator, and the outer winding ismA phase concentrated winding, satisfyP so=2k 1 mWherein isk 1A positive integer; the number of the salient pole teeth of the outer rotor isP roSatisfy the following requirementsP ro=P so±2N1In which N is1Is a positive integer.
Preferably, the number of the inner stator salient pole teeth isP siThe inner windings being formed of symmetrically distributedP siA coil sleeved on the salient pole teeth of the inner stator, and the inner side winding isnA phase concentrated winding, satisfyP si=2k 2 nWherein isk 2A positive integer; the number of the salient pole teeth of the inner rotor isP riSatisfy the following requirementsP ri=P si±2N2In which N is2Is a positive integer.
Preferably, the salient pole teeth on the outer stator, the outer rotor, the inner stator and the inner rotor are all oriented in a radial direction.
Preferably, the inner winding and the outer winding are both multiphase concentrated armature windings.
Has the advantages that: the invention relates to a radial magnetic field composite motor, wherein an outer stator and an outer rotor form an outer motor, and an inner stator and an inner rotor form an inner motor. The inner and outer motors are completely independent and have no electromagnetic coupling, so that the inner and outer motors can be independently controlled. The inner motor and the outer motor have various motor structure options, for example, the inner motor can adopt a double salient pole permanent magnet motor and a magnetic flux reversal motor. The tooth groove matching, the phase number, the excitation mode and the like of the stator and the rotor of the inner motor and the outer motor of the radial magnetic field composite motor can be flexibly adjusted according to the performance requirements of the system.
In the invention, the inner stator is rotationally connected with the rotating shaft through the first bearing, and can rotate at a certain rotating speed during specific operation. The outer rotor is fixedly connected with the inner rotor through a magnetism isolating ring, the outer rotor, the magnetism isolating ring and the inner rotor form a motor rotor and are fixedly connected with the rotating shaft through a rotor support, the outer diameter of the outer stator is fixed on the shell, the rotating speed is zero, and the outer stator is rotatably connected with the rotating shaft through a second bearing and a third bearing.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the external motor mainly realizes that the speed of the motor is regulated according to the requirement of the rotating speed of a load, so that the output shaft of the rotor rotates at a target rotating speed; the inner motor is used for providing driving torque or braking torque according to load requirements so as to make up for the deficiency of the output torque of the outer motor, and the inner stator can rotate at a certain rotating speed and at a different speed with the inner rotor during the operation of the motor, so that the inner motor always works near a rated point with higher efficiency, and therefore, the inner motor has higher torque output capacity. When the motor runs at low speed or high speed, the shortage of the output torque of the outer motor can be provided by the inner motor, so that the requirements of low-speed large torque and wide speed regulation range running of the motor are met.
2. The outer stator and the outer rotor are both provided with no permanent magnet, so that irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation of the outer speed regulation motor can be avoided; for the internal motor, the excitation device only works in a magnetism increasing mode and does not participate in the field weakening speed regulation. Under a high-speed working condition, the speed regulation is finished by the outer motor, the inner motor always works near a rated point, the torque output is increased, and the irreversible demagnetization risk of the permanent magnet caused by the weak magnetic speed regulation of the inner motor is avoided; therefore, the invention improves the working stability of the permanent magnet and the working reliability of the motor.
3. The inner motor and the outer motor can operate in different working modes such as independent driving or common driving, and when one motor fails, the other motor can operate independently for a short time, so that the motors have certain fault tolerance.
Drawings
Fig. 1 is a cross-sectional view of a radial magnetic field composite motor with an inner motor of 3-phase stator 12 slots/rotor 22 poles and an outer motor of 3-phase stator 12 slots/rotor 8 poles.
Fig. 2 is a sectional view of the radial magnetic field composite motor of the present invention.
In the figure: the rotor comprises an outer stator 1, an outer rotor 2, an inner rotor 3, an inner stator 4, a rotating shaft 5, a shell 6, a rotor support 7, a first bearing 8, a second bearing 9, a third bearing 10, an outer side winding 1-1, a magnetic isolating ring 2-3, an inner side winding 4-1 and an excitation device 4-2.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present embodiment provides a radial magnetic field composite motor, as shown in fig. 1, which mainly includes a rotating shaft 5, a first bearing 8 surrounding the rotating shaft 5, an inner stator 4 surrounding the first bearing 8, an inner rotor 3 surrounding the inner stator 4, magnetism isolating rings 2-3 surrounding the inner rotor 3, an outer rotor 2 surrounding the magnetism isolating rings 2-3, and an outer stator 1 surrounding the outer rotor 2. An air gap is arranged between the outer stator 1 and the outer rotor 2, an air gap is arranged between the inner stator 4 and the inner rotor 3, one side of the outer rotor 2 facing the outer stator 1 and one side of the inner rotor 3 facing the inner stator 4 are both provided with salient pole teeth without windings, the inner side of the outer stator 1 is provided with the salient pole teeth and an outer side winding 1-1 wound on the salient pole teeth, the outer side of the inner stator 4 is provided with the salient pole teeth and an inner side winding 4-1 wound on the salient pole teeth, the salient pole teeth of the inner stator 4 are provided with an excitation device 4-2, and the magnetization direction of the excitation device 4-2 is alternately magnetized along the circumferential tangential direction of the inner stator. The excitation device 4-2 in the present embodiment is a permanent magnet, but a hybrid excitation device may be used. Note that, in the present embodiment, the salient poles of the stator and the rotor are oriented in the radial direction.
Referring to fig. 1, the present embodiment specifically describes the technical solution of the present invention by taking a radial magnetic field composite motor with an inner motor of 3-phase stator 12 slots/rotor 22 poles and an outer motor of 3-phase stator 12 slots/rotor 8 poles as an example.
The radial inner side of a magnetic yoke of the outer stator 1 protrudes 12 salient pole teeth, permanent magnets are not arranged on the salient pole teeth, 12 armature winding coils are sleeved on the 12 salient pole teeth, and every 4 coils are connected in series to form a phase concentrated winding, so that a three-phase outer armature winding is formed, namely an outer winding 1-1, the number of salient pole teeth of the outer rotor 2 is 8, and the outer stator 1, the outer rotor 2 and the outer winding 1-1 on the outer stator 1 form a three-phase 12/8-pole switch reluctance outer motor; the inner stator 4 is distributed with 12V-shaped magnetic conductive cores and 12 rectangular permanent magnets 4-2 along the circumference to be alternately and adjacently placed to form 12 inner stator magnetic poles, each inner stator magnetic pole is composed of a permanent magnet and two adjacent inner stator teeth of the V-shaped magnetic conductive cores on two sides of the circumference, the opening of the V-shaped magnetic conductive core faces to the inner rotor 3, the number of salient pole teeth of the inner rotor 3 is 22, 12 winding coils are wound on the 12 inner stator magnetic poles of the inner stator 4, wherein each 4 winding coils form a phase concentration winding, and thus an inner three-phase concentration armature winding, namely an inner winding 4-1, is formed. The inner rotor 3, the inner stator 4, the permanent magnet 4-2 on the inner stator and the inner winding 4-1 form a three-phase 12/22-pole permanent magnet flux switching inner motor structure.
Referring to fig. 2, an inner stator 4 is rotatably connected with a rotating shaft 5 through a first bearing 8, an outer rotor 2 is fixedly connected with an inner rotor 3 through a magnetism isolating ring 2-3, the outer rotor 2, the magnetism isolating ring 2-3 and the inner rotor 3 form a motor rotor and are fixedly connected with the rotating shaft 5 through a rotor support 7, and the outer diameter of the outer stator 1 is fixed on a shell 6 and is rotatably connected with the rotating shaft 5 through a second bearing 9 and a third bearing 10.
The radial magnetic field composite motor in the embodiment is functionally divided into two parts: one part is an external speed-regulating motor, a three-phase 12/8-pole switched reluctance motor structure is adopted, the structure is simple, the motor is suitable for high-speed operation, the motor is easy to cool, and high temperature rise can be allowed due to the absence of permanent magnets; the other part is a torque-adjusting internal motor, a three-phase 12/22-pole permanent magnet flux switching motor structure is adopted, and the rotor is simple in structure and has high torque density and high efficiency. Because outer rotor 2 and inner rotor 3 all with pivot 5 fixed connection, consequently interior motor and outer motor have the same rotor rotational speed, outer stator 1 and shell 6 fixed connection on the frame, no rotational speed, inner stator 4 can rotate with certain rotational speed according to operating mode needs owing to the existence of first bearing 8. In the invention, the external motor mainly realizes that the speed regulation of the motor is completed according to the requirement of the rotating speed of the load, so that the rotating shaft 5 rotates at a target rotating speed and simultaneously outputs a certain torque; the inner motor is used for providing driving torque or braking torque according to load requirements to make up for the deficiency of the output torque of the outer motor, and the inner stator 4 and the inner rotor 3 can rotate in the same direction at a different speed in specific operation, so that the inner motor always works near a rated point with higher efficiency. The outer motor has no permanent magnet, so that the speed regulation is realized without utilizing the weak magnetism of the permanent magnet in the speed regulation operation of the motor, the motor cost is reduced, and the operation reliability of the outer motor is improved. Interior motor adopts the permanent-magnet machine structure that has the effect of gathering magnetism to realize big torque density and high efficiency, have great torque regulation ability, and because first bearing 8's effect, interior motor can work near rated point all the time when different operating modes, no matter in addition when low-speed or high-speed operation, outer motor output torque's not enough all can be provided by interior motor, thereby realizes the demand of motor low-speed big torque and wide speed governing range operation.
The inner motor system and the outer motor system of the radial magnetic field composite motor have no electromagnetic coupling, can be independently controlled according to two common motors, have controllable parameters which are greatly more than those of a common magnetic flux switching motor, and are very flexible. The inner motor and the outer motor can run in different working modes such as single-machine driving, double-machine common driving, double-machine power generation and the like according to different working condition requirements, and when the inner motor and the outer motor both do power generation, two groups of electric energy with different power, frequency, amplitude and voltage grade can be output; the internal and external motor systems can also be operated by one for power generation and the other for electric operation, so as to meet different application occasions and performance requirements.
The radial magnetic field composite motor integrates the permanent magnetic flux switching outer motor and the switched reluctance inner motor in a radial magnetic field motor space, and provides two power flow paths. The inner motor and the outer motor can adopt other motor structures, so that the flexibility of the system is greatly improved, and the application range is expanded.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A radial magnetic field composite motor is characterized by comprising a rotating shaft (5), a first bearing (8) surrounding the rotating shaft (5), an inner stator (4) surrounding the first bearing (8), an inner rotor (3) surrounding the inner stator (4), a magnetism isolating ring (2-3) surrounding the inner rotor (3), an outer rotor (2) surrounding the magnetism isolating ring (2-3), and an outer stator (1) surrounding the outer rotor (2); air gaps are arranged between the outer stator (1) and the outer rotor (2) and between the inner stator (4) and the inner rotor (3); the inner stator (4) is rotationally connected with the rotating shaft (5) through the first bearing (8), and the outer rotor (2) is fixedly connected with the inner rotor (3) through the magnetism isolating ring (2-3); the outer rotor (2), the magnetism isolating ring (2-3) and the inner rotor (3) form a motor rotor and are fixedly connected with the rotating shaft (5) through a rotor support (7), and the outer stator (1) is fixed on the shell (6) and is rotationally connected with the rotating shaft (5).
2. The radial magnetic field composite motor according to claim 1, wherein salient pole teeth are provided on the opposite sides of the outer stator (1) and the outer rotor (2) and the opposite sides of the inner stator (4) and the inner rotor (3), and an outer winding (1-1) is provided on the salient pole teeth of the outer stator (1), and an inner winding (4-1) and an excitation device (4-2) are provided on the salient pole teeth of the inner stator (4).
3. A radial magnetic field composite motor according to claim 2, wherein the magnetizing direction of the exciting means (4-2) is alternately magnetizing in a tangential direction along the circumference of the inner stator (4).
4. Radial field hybrid machine according to claim 2, characterized in that the excitation means (4-2) are permanent magnets or hybrid excitation means.
5. Radial field composite machine according to claim 1, characterised in that the number of salient pole teeth of the outer stator (1) isP soThe outer windings (1-1) are symmetrically distributedP soThe coils are sleeved on salient pole teeth of the outer stator (1), and the outer winding (1-1) ismA phase concentrated winding, satisfyP so=2k 1 mWherein isk 1A positive integer;
the number of salient pole teeth of the outer rotor (2) isP roSatisfy the following requirementsP ro=P so±2N1In which N is1Is a positive integer.
6. A radial-field hybrid machine according to claim 5, characterized in that the number of salient poles of the inner stator (4) isP siThe inner windings (4-1) are symmetrically distributedP siA coil sleeved on the salient pole teeth of the inner stator, and the inner side winding (4-1) isnA phase concentrated winding, satisfyP si=2k 2 nWherein isk 2A positive integer;
the number of the salient pole teeth of the inner rotor (3) isP riSatisfy the following requirementsP ri=P si±2N2In which N is2Is a positive integer.
7. The radial field compound motor according to any of claims 1 to 6, characterized in that the salient pole teeth on the outer stator (1), the outer rotor (2), the inner stator (4) and the inner rotor (3) are oriented in radial direction.
8. A radial field composite machine according to any of claims 1 to 6, characterized in that the inner winding (4-1) and the outer winding (1-1) are both polyphase concentrated armature windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873710.8A CN110601477A (en) | 2019-09-17 | 2019-09-17 | Radial magnetic field composite motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910873710.8A CN110601477A (en) | 2019-09-17 | 2019-09-17 | Radial magnetic field composite motor |
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| Publication Number | Publication Date |
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| CN110601477A true CN110601477A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910873710.8A Pending CN110601477A (en) | 2019-09-17 | 2019-09-17 | Radial magnetic field composite motor |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951091A (en) * | 2010-09-09 | 2011-01-19 | 中国科学院长春光学精密机械与物理研究所 | Double-rotor multi-pole motor of micro unmanned aerial vehicle |
| CN103997171A (en) * | 2014-05-30 | 2014-08-20 | 广州市昊志机电股份有限公司 | Novel birotor motor |
| CN104201848A (en) * | 2014-07-04 | 2014-12-10 | 东南大学 | Double-stator permanent-magnet vernier wind driven generator |
| CN104362822A (en) * | 2014-10-24 | 2015-02-18 | 东南大学 | Self-flux-weakening composite flux-switching permanent-magnet motor |
| CN108448847A (en) * | 2018-03-21 | 2018-08-24 | 重庆大学 | A kind of brushless bimorph transducer-double-rotor machine of radial magnetic field modulation system |
| CN210608876U (en) * | 2019-09-17 | 2020-05-22 | 淮阴工学院 | Radial magnetic field composite motor |
-
2019
- 2019-09-17 CN CN201910873710.8A patent/CN110601477A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951091A (en) * | 2010-09-09 | 2011-01-19 | 中国科学院长春光学精密机械与物理研究所 | Double-rotor multi-pole motor of micro unmanned aerial vehicle |
| CN103997171A (en) * | 2014-05-30 | 2014-08-20 | 广州市昊志机电股份有限公司 | Novel birotor motor |
| CN104201848A (en) * | 2014-07-04 | 2014-12-10 | 东南大学 | Double-stator permanent-magnet vernier wind driven generator |
| CN104362822A (en) * | 2014-10-24 | 2015-02-18 | 东南大学 | Self-flux-weakening composite flux-switching permanent-magnet motor |
| CN108448847A (en) * | 2018-03-21 | 2018-08-24 | 重庆大学 | A kind of brushless bimorph transducer-double-rotor machine of radial magnetic field modulation system |
| CN210608876U (en) * | 2019-09-17 | 2020-05-22 | 淮阴工学院 | Radial magnetic field composite motor |
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