CN113595281A - High-torque-density composite permanent magnet motor - Google Patents
High-torque-density composite permanent magnet motor Download PDFInfo
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- CN113595281A CN113595281A CN202110849284.1A CN202110849284A CN113595281A CN 113595281 A CN113595281 A CN 113595281A CN 202110849284 A CN202110849284 A CN 202110849284A CN 113595281 A CN113595281 A CN 113595281A
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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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
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Linear Motors (AREA)
Abstract
The invention discloses a high-torque-density composite permanent magnet motor which comprises a stator and a rotor arranged on the outer side of the stator, wherein the rotor comprises a rotor ring and Halbach array magnetic steel uniformly arranged on the inner wall of the rotor ring; stator teeth are uniformly arranged on the stator, at least two modulation teeth are arranged at the radial end part of each stator tooth, and the total number of the modulation teeth is an integral multiple of the number of stator slots; small tooth part grooves facing outwards in the radial direction are formed in the modulation teeth, and large tooth part grooves are formed between adjacent modulation teeth; an air gap is arranged between the modulation tooth and the Halbach array magnetic steel; stator slots are formed between adjacent stator teeth, stator windings are arranged at the bottoms of the stator slots, permanent magnets fixed with the modulation teeth are arranged at notches of the outer ends of the stator slots, and the polarities of the adjacent permanent magnets are opposite. The invention can utilize the internal space of the motor to the maximum extent and greatly improve the torque and the torque density of the motor.
Description
Technical Field
The invention belongs to the technical field of motor equipment, and particularly relates to a high-torque-density composite permanent magnet motor.
Background
With the development of motor technology, the motor has higher requirements on the output capability of the motor, the motor is required to have higher torque output capability at low speed, the requirement on torque pulsation is low, and the requirement on control precision is high.
The permanent magnet vernier motor introduces a modulation pole structure on the stator teeth of the traditional permanent magnet motor, and modulates the stator armature winding magnetic field with low pole pair number and high rotating speed by using a special vernier effect so as to obtain a harmonic magnetic field component which can be matched and acted with the permanent magnet magnetic field with high pole pair number and low rotating speed. The mode can realize the purpose of low speed and high torque without increasing the volume and the number of slots of the motor.
The low-speed large torque of the permanent magnet vernier motor is suitable for direct drive occasions of the motor, the use of a gear box can be avoided by adopting direct drive of the permanent magnet motor, the mechanical structure is simplified, and noise and faults caused by gear meshing transmission are eliminated, so that the efficiency and the reliability of the system are improved. But permanent magnet vernier motors still require more effort and investment in breaking through the torque limit and reducing cogging torque.
In recent years, researchers have proposed a permanent magnet motor designed by utilizing a bidirectional modulation effect, the bidirectional field modulation effect is similar to a vernier effect principle, and the output torque of the motor is increased by introducing a Halbach permanent magnet array on a stator to enhance the air gap flux density of the motor, but the problems of the leakage flux, the cogging torque and the like of the motor are still obvious.
Chinese patent publication No. CN 111064332a discloses a bilateral Halbach alternating pole type permanent magnet vernier motor, which includes a double stator and a single rotor, wherein the tooth end portions of the outer stator and the inner stator are split into two modulation poles; an inner rotor groove and an outer rotor groove are formed in the inner side and the outer side of the rotor core at intervals in the circumferential direction, and Halbach permanent magnets are embedded in the grooves. Chinese patent publication No. CN109245471A discloses an alternating-pole permanent magnet vernier motor, which comprises an outer stator part, a rotor part and an inner stator part, wherein the outer stator part comprises an outer stator core, and outer stator slots and outer stator teeth are uniformly distributed at intervals in the inner circumference of the outer stator core; an armature winding is embedded in the outer stator slot; the outer stator teeth comprise stator teeth A and stator teeth B which are alternately arranged, and the end part of the stator teeth A is provided with a modulation pole; the end of the stator tooth B is split into two modulation poles, and an outer stator permanent magnet array is arranged between the modulation poles.
Above-mentioned two kinds of current motor structures all can increase the effective air gap area of motor, but motor torque density is still high inadequately, and two stator structure are complicated, have increased the degree of difficulty and the cost of manufacturing and installation, and easily lead to the air gap inhomogeneous, and motor vibration noise is big.
Disclosure of Invention
The invention provides a high-torque-density composite permanent magnet motor, which can utilize the internal space of the motor to the maximum extent and greatly improve the torque and the torque density of the motor.
A high-torque-density composite permanent magnet motor comprises a stator and a rotor arranged on the outer side of the stator, wherein the rotor comprises a rotor ring and Halbach array magnetic steel uniformly arranged on the inner wall of the rotor ring;
the stator comprises stator teeth and stator slots, the radial end part of each stator tooth is provided with at least two modulation teeth, and the total number of the modulation teeth is integral multiple of the number of the stator slots; small tooth part grooves facing outwards in the radial direction are formed in the modulation teeth, and large tooth part grooves are formed between adjacent modulation teeth; an air gap is arranged between the modulation tooth and the Halbach array magnetic steel;
the bottom of the stator slot is provided with a stator winding, the outer end notch of the stator slot is provided with a permanent magnet fixed with the modulation teeth, the outer end faces of the permanent magnet and the modulation teeth are arranged in a common arc shape, and the polarities of the adjacent permanent magnets are opposite.
According to the invention, the Halbach magnetic steel array is arranged on the inner wall of the rotor ring in a sticking mode, so that a rotor magnetic yoke part can be omitted, and the outer ring of the rotor directly adopts a non-magnetic structure, so that the internal space of the motor can be utilized to the maximum extent. The modulation teeth are designed in a special structure, and each modulation tooth is provided with a small groove, so that torque fluctuation can be reduced, harmonic waves are fully utilized, and the torque of the motor is further improved. Meanwhile, the permanent magnets which are magnetized in the radial direction and are distributed with NS poles alternately and uniformly are arranged on the notches of the stator, so that the internal space of the motor can be fully utilized, the air gap flux density of the motor is improved, and the torque density and the power density of the motor are improved.
Furthermore, in the Halbach array magnetic steel, two adjacent Halbach magnetic steels with vertical magnetizing directions form a magnetic pole pair, and the polarities of 2 adjacent magnetic pole pairs are opposite; the width m3 of each Halbach magnetic steel along the circumferential direction is the same, and the thickness m4 of each Halbach magnetic steel along the radial direction is the same.
Further, the pole pair number Pr of the Halbach array magnetic steel, the total number Zm of the modulation teeth and the pole pair number Ps of the stator winding satisfy the following relations:
Pr＝Zm±Ps。
the stator teeth of the motor are split and can form modulation poles to form a modulation magnetic field, and the stator armature winding magnetic field with low pole pair number and high rotating speed is modulated by using a special vernier effect to obtain a harmonic magnetic field component which can be matched with and acts on the permanent magnet magnetic field with high pole pair number and low rotating speed. The structure can realize low speed and large torque under the condition of not increasing the volume and the number of slots of the motor.
Further, the width and thickness of the permanent magnet satisfy the following relationship:
m1＝(1～1.5)m3
m2＝(1～1.5)m4
wherein m1 represents the width of the permanent magnet along the circumferential direction, m2 represents the thickness of the permanent magnet along the radial direction, m3 represents the width of the Halbach magnetic steel along the circumferential direction, and m4 represents the thickness of the Halbach magnetic steel along the radial direction.
When the relation is met, the air gap magnetic density generated by the motor is larger, and the low-order harmonic existing in the air gap can be fully utilized to act with the armature winding, so that the torque is provided for the motor. That is, this relationship can make full use of harmonics, further improving motor torque and torque density.
Preferably, the outer end part of each stator tooth is provided with two modulation teeth; the modulating teeth are provided with a tooth part small groove at the central position, or a plurality of tooth part small grooves are uniformly distributed.
Further, the radial thickness t2 of the modulation tooth is the same as the radial depth s2 of the small groove of the tooth part; the circumferential width t1 of the large groove of the tooth part is 1/3 of the width t3 of the outer end of the stator tooth; the circumferential width s1 of the small tooth grooves and the circumferential width t1 of the large tooth grooves satisfy the relationship: s1 is (0.1-0.4) t 1.
When the above relationship is satisfied, the motor torque is maximum and the torque ripple is minimum. The invention effectively utilizes harmonic waves and improves torque density.
Preferably, the stator winding adopts fractional slot concentrated winding. Compared with distributed winding, the fractional-slot concentrated winding has shorter winding end and less stator copper consumption.
Compared with the prior art, the invention has the following beneficial effects:
1. in the invention, the rotor of the motor adopts an array surface-mounted Halbach, so that the torque capacity of the motor can be effectively improved; modulation teeth are arranged on the outer ring of the stator, and the number of the modulation teeth is an integral multiple of the number of the slots; the stator not only plays a role in providing a rotating magnetic field, but also plays a role in modulating the magnetic field by the tooth part, so that the power and the torque of the motor are further improved, and the motor is suitable for occasions with high power density and high torque.
2. The invention directly arranges a plurality of modulation teeth on the stator to form a new stator tooth with auxiliary teeth, omits a magnetic modulation block, thereby reducing the number of stator slots, adopting a fractional slot concentrated winding form, leading the structure of the motor to be simpler and more compact, and leading the processing and the manufacturing to be more convenient and faster, and leading the low-order harmonic wave existing in the air gap to act with the armature winding to provide torque for the motor.
3. The modulation teeth of the invention adopt special structural design, and each modulation tooth is provided with a small groove. The torque fluctuation is reduced, the harmonic waves are fully utilized, and the motor torque is further improved.
4. Permanent magnets are arranged on the notches of the stator, and N, S poles are alternately and uniformly distributed; the internal space of the motor is fully utilized, the air gap flux density of the motor is improved, and the torque density and the power density of the motor are improved.
Drawings
Fig. 1 is a schematic structural diagram of a high torque density composite permanent magnet motor according to the present invention;
fig. 2 is a partially enlarged view of the area a in fig. 1.
In the figure: 1-rotor ring, 2-Halbach array magnetic steel, 3-permanent magnet, 4-air gap, 5-stator, 6-stator tooth, 7-modulation tooth, 8-tooth small groove, 9-tooth large groove and 10-stator groove.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in fig. 1 and 2, the high-torque-density composite permanent magnet motor comprises a stator 5 and a rotor arranged outside the stator 5, wherein the rotor comprises a rotor ring 1 and Halbach array magnetic steel 2 uniformly arranged on the inner wall of the rotor ring 1.
The stator 5 comprises stator teeth 6 and stator slots 10, the outer end part of each stator tooth 6 is provided with two modulation teeth 7, and the total number of the modulation teeth 7 is integral multiple of the number of the stator slots; small tooth part grooves 8 facing outwards in the radial direction are formed in the modulation teeth 7, and large tooth part grooves 9 are formed between adjacent modulation teeth 7; an air gap 4 is arranged between the modulation teeth 7 and the Halbach array magnetic steel 2.
The bottom of the stator slot 10 is provided with a stator winding, the outer end notch of the stator slot 10 is provided with a permanent magnet 3 fixed with the modulation teeth 7, and the polarities of the adjacent permanent magnets 3 are opposite.
Specifically, Halbach array magnet steel 2 adopts to paste the mode and is fixed in on the inner wall of rotor ring 1, and in Halbach array magnet steel 2, two blocks of adjacent Halbach magnet steel's the direction of magnetizing is perpendicular, constitutes a magnetic pole pair, and the polarity of 2 adjacent magnetic pole pairs is opposite.
The width m3 of each Halbach magnetic steel along the circumferential direction is the same, and the thickness m4 of each Halbach magnetic steel along the radial direction is the same.
The pole pair number Pr of the Halbach array magnetic steel 2, the total number Zm of the modulation teeth 7 and the pole pair number Ps of the stator winding satisfy the following relations: pr is Zm + -Ps.
The width and thickness of the permanent magnet 3 satisfy the following relationship:
m1＝(1～1.5)m3
m2＝(1～1.5)m4
wherein m1 represents the width of the permanent magnet along the circumferential direction, m2 represents the thickness of the permanent magnet along the radial direction, m3 represents the width of the Halbach magnetic steel along the circumferential direction, and m4 represents the thickness of the Halbach magnetic steel along the radial direction.
A small tooth part groove 8 is formed in the modulation tooth 7 at the central position, and the radial thickness t2 of the modulation tooth 7 is the same as the radial depth s2 of the small tooth part groove 8; the circumferential width t1 of the tooth large slot 9 is 1/3 of the outer end width t3 of the stator tooth 6; the circumferential width s1 of the small tooth grooves 8 and the circumferential width t1 of the large tooth grooves 9 satisfy the relationship: s1 is (0.1-0.4) t 1. At the moment, the motor torque is maximum, and the torque ripple is minimum.
In this embodiment, the motor employs 18 slots 56 poles. Halbach array magnetic steel 2 is uniformly distributed on the inner wall of the rotor ring 1, 56 poles are shared, one pole is composed of 2 pieces of Halbach magnetic steel, and the polarities of the adjacent 2 poles are opposite. The outer diameter D4 of the rotor ring 1 is 204mm, and the inner diameter D3 is 200 mm; the circumferential width m3 of the Halbach magnetic steel is 5.6mm, the radial thickness m4 is 4mm, and the inner circle diameter D2 of the magnetic steel is 192 mm.
And a 0.35mm air gap (namely the air gap between the modulation teeth 7 and the Halbach array magnetic steel 2) is arranged between the rotor and the stator 5. The stator outer diameter D1 is 191.3mm, and the number of stator slots is 18. The stator teeth 6 are provided with modulation teeth 7, and the number of the modulation teeth is 36. According to the basic relation of the invention, the pole pair number Pr of the Halbach array magnetic steel is 28, the number Zm of the stator modulation teeth is 36, and the pole pair number Ps of the stator winding is 8, and the following relation is followed: pr is Zm +/-Ps, i.e. 28 is 36-8.
The modulation teeth 7 are provided with small tooth part slots 8 at the central positions. The radial thickness t2 of the modulation tooth 7 is equal to the radial depth s2 of the small groove of the tooth part, and the size is 3.5 mm. The circumferential width t1 of the tooth large slot 9 is 8mm, and the outer end width t3 of the stator tooth 6 is 24. The bottom of the stator slot 10 is provided with an armature winding, the top of the notch is provided with a permanent magnet 3, the permanent magnet 3 adopts radial magnetization, and N, S of adjacent permanent magnets 3 are alternately and uniformly distributed, and the total number of poles is 18. The circumferential width m1 of the permanent magnet is 7.4 mm; the radial thickness m2 is 4.8 mm.
Compared with the traditional external rotor motor and the magnetic gear motor. The Halbach array magnetic steel 2 is arranged on the inner wall of the rotor ring, so that the air gap flux density of the motor is enhanced, and the output torque of the motor is increased. The rotor yoke is omitted, the rotor yoke is directly attached to the rotor part without magnetic conduction, the internal space of the motor is fully utilized, and the torque density of the motor is further improved.
Through set up the modulation tooth on the outer lane of stator, the stator not only plays the effect that provides rotating magnetic field, and its tooth portion more plays the effect of magnetic field modulation, reaches the effect of output torque simultaneously, and then has improved the moment of torsion output ability of motor, and simple structure, and the manufacturing difficulty is low.
Through set up N, S permanent magnet of utmost point alternative equipartition at the stator notch, make full use of motor inner space, improved motor air gap flux density, promoted motor torque density and power density.
The magnetic field modulation motor has the characteristics of high torque density, high power density and low torque fluctuation. The device is particularly suitable for the application occasions of low speed and large torque. In addition, the invention is not limited to an outer rotor motor, and is also suitable for a high-torque density composite permanent magnet motor of an inner rotor.
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A high-torque-density composite permanent magnet motor comprises a stator (5) and a rotor arranged on the outer side of the stator (5), and is characterized in that the rotor comprises a rotor ring (1) and Halbach array magnetic steel (2) uniformly arranged on the inner wall of the rotor ring (1);
the stator (5) comprises stator teeth (6) and stator slots (10), the outer end of each stator tooth (6) is provided with at least two modulation teeth (7), and the total number of the modulation teeth (7) is an integral multiple of the number of the stator slots; small tooth grooves (8) which face outwards in the radial direction are formed in the modulation teeth (7), and large tooth grooves (9) are formed between adjacent modulation teeth (7); an air gap (4) is arranged between the modulation tooth (7) and the Halbach array magnetic steel (2);
the stator slot structure is characterized in that a stator winding is arranged at the bottom of the stator slot (10), a permanent magnet (3) fixed with the modulation tooth (7) is arranged at the notch of the outer end of the stator slot (10), the outer end faces of the permanent magnet (3) and the modulation tooth (7) are arranged in a common arc mode, and the polarities of the adjacent permanent magnets (3) are opposite.
2. The high-torque-density composite permanent magnet motor according to claim 1, wherein in the Halbach array magnetic steel (2), two adjacent Halbach magnetic steels with vertical magnetizing directions form a magnetic pole pair, and the polarities of the adjacent 2 magnetic pole pairs are opposite;
the width m3 of each Halbach magnetic steel along the circumferential direction is the same, and the thickness m4 of each Halbach magnetic steel along the radial direction is the same.
3. The high torque density compound permanent magnet motor according to claim 2, characterized in that the pole pair number Pr of the Halbach array magnet steel (2), the total number Zm of the modulation teeth (7) and the pole pair number Ps of the stator winding satisfy the following relationship:
Pr＝Zm±Ps。
4. the high torque density compound permanent magnet machine according to claim 2, characterized in that the width and thickness of the permanent magnet (3) satisfy the following relation:
m1＝(1～1.5)m3
m2＝(1～1.5)m4
wherein m1 represents the width of the permanent magnet along the circumferential direction, m2 represents the thickness of the permanent magnet along the radial direction, m3 represents the width of the Halbach magnetic steel along the circumferential direction, and m4 represents the thickness of the Halbach magnetic steel along the radial direction.
5. The high torque density composite permanent magnet motor according to claim 1, wherein the outer end of each stator tooth (6) is provided with two modulation teeth (7); the modulating teeth (7) are provided with a tooth part small groove (8) at the central position, or a plurality of tooth part small grooves (8) are uniformly distributed.
6. The high torque density compound permanent magnet machine according to claim 1, characterized in that the radial thickness t2 of the modulation teeth (7) is the same as the radial depth s2 of the teeth slots (8).
7. The high torque density compound permanent magnet motor according to claim 6, wherein the circumferential width t1 of the tooth large slot (9) is 1/3 of the outer end width t3 of the stator teeth (6).
8. The high torque density composite permanent magnet motor according to claim 7, wherein the circumferential width s1 of the small tooth slots (8) and the circumferential width t1 of the large tooth slots (9) satisfy the relationship: s1 is (0.1-0.4) t 1.
9. The high torque density compound permanent magnet machine of claim 1, wherein the stator winding is fractional slot concentrated winding.
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| CN202110849284.1A CN113595281B (en) | 2021-07-27 | 2021-07-27 | High-torque-density composite permanent magnet motor |
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| CN202110849284.1A CN113595281B (en) | 2021-07-27 | 2021-07-27 | High-torque-density composite permanent magnet motor |
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| CN113595281B CN113595281B (en) | 2022-10-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337116A (en) * | 2021-12-31 | 2022-04-12 | 华中科技大学 | Motor with rotor cooling structure and application thereof |
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| JP2001258221A (en) * | 2000-03-10 | 2001-09-21 | Genesis:Kk | Self-starting synchronous motor |
| CN104184290A (en) * | 2014-07-16 | 2014-12-03 | 江苏大学 | Permanent-magnetism fault-tolerant vernier motor made of mixed magnetic materials |
| CN105162302A (en) * | 2015-08-26 | 2015-12-16 | 江苏大学 | Low-speed high-torque hybrid magnetic material permanent-magnet fault-tolerant motor |
| CN107959367A (en) * | 2016-10-18 | 2018-04-24 | 中国科学院宁波材料技术与工程研究所 | A kind of bimorph transducer composite excitation eddy current damping device |
| CN112737160A (en) * | 2020-12-29 | 2021-04-30 | 东南大学 | Method for improving power factor of concentrated winding outer rotor vernier motor |
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2021
- 2021-07-27 CN CN202110849284.1A patent/CN113595281B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001258221A (en) * | 2000-03-10 | 2001-09-21 | Genesis:Kk | Self-starting synchronous motor |
| CN104184290A (en) * | 2014-07-16 | 2014-12-03 | 江苏大学 | Permanent-magnetism fault-tolerant vernier motor made of mixed magnetic materials |
| CN105162302A (en) * | 2015-08-26 | 2015-12-16 | 江苏大学 | Low-speed high-torque hybrid magnetic material permanent-magnet fault-tolerant motor |
| CN107959367A (en) * | 2016-10-18 | 2018-04-24 | 中国科学院宁波材料技术与工程研究所 | A kind of bimorph transducer composite excitation eddy current damping device |
| CN112737160A (en) * | 2020-12-29 | 2021-04-30 | 东南大学 | Method for improving power factor of concentrated winding outer rotor vernier motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337116A (en) * | 2021-12-31 | 2022-04-12 | 华中科技大学 | Motor with rotor cooling structure and application thereof |
| CN114337116B (en) * | 2021-12-31 | 2023-03-31 | 华中科技大学 | Motor with rotor cooling structure and application thereof |
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