CN114337121A - Driving motor and electric automobile - Google Patents
Driving motor and electric automobile Download PDFInfo
- Publication number
- CN114337121A CN114337121A CN202111566883.9A CN202111566883A CN114337121A CN 114337121 A CN114337121 A CN 114337121A CN 202111566883 A CN202111566883 A CN 202111566883A CN 114337121 A CN114337121 A CN 114337121A
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- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000004519 grease Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The invention relates to a driving motor and an electric automobile. The driving motor comprises a rotating shaft, a front end cover, a rear end cover and a junction box cover plate, wherein two ends of the rotating shaft are respectively installed on the front end cover and the rear end cover through bearing bearings, the outer side of the rear end cover is connected with the junction box cover plate, a bearing chamber is arranged on the junction box cover plate, a conductive bearing is installed in the bearing chamber, the rotating shaft is in interference fit with the conductive bearing, the junction box cover plate is used for being connected with a frame, shaft voltage generated by the rotating shaft is transmitted to the frame through the conductive bearing and the junction box cover plate, and then the shaft voltage is transmitted to the ground through the frame. The invention also provides an electric automobile which comprises the driving motor. The invention solves the problem of electric corrosion of the motor bearing of the existing electric automobile and can also solve the problem of high production cost.
Description
Technical Field
The invention relates to the technical field of automobile accessories, in particular to a driving motor and an electric automobile.
Background
In recent years, with the rapid development of new energy automobiles, the requirement on the rotating speed of a driving motor is higher and higher, the demand and the use amount of the high-rotating-speed driving motor are increased day by day, a driving motor system is used as the core of the new energy automobiles, the power performance of the whole automobile is determined, and the reliability of the driving motor system also determines the quality assurance and the economic performance of the whole automobile.
However, in the case of a vehicle motor with high rotation speed, high voltage and high power, the reliability of the motor is limited by the reliability of the motor bearing. Among them, the problem of galvanic corrosion is a crucial part of affecting the reliability of bearings of electric machines. At present, the main two ways of controlling the electric corrosion of the motor bearing are: firstly, increasing a magnetic ring through an inverter to reduce PWM wave amplitude, and restraining shaft current from the source; and secondly, cutting off a shaft current path by adopting an insulating bearing. Although the two modes improve the problem of electric corrosion of the motor bearing to a certain extent, the cost is greatly increased, and the development trend of high reliability and low cost of the motor is not met.
Disclosure of Invention
The invention aims to provide a driving motor and an electric automobile, which are used for solving the problem of electric corrosion of a motor bearing of the conventional electric automobile and solving the problem of high production cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a driving motor, includes pivot, front end housing, rear end cap and terminal box apron, the both ends of pivot are installed on front end housing and rear end cap through bearing the bearing respectively, and the terminal box apron is connected in the outside of rear end cap, set up the bearing room on the terminal box apron, install conductive bearing in it, pivot and conductive bearing interference fit, the terminal box apron is used for linking to each other with the frame, and the axle voltage that makes the pivot produce transmits the frame through conductive bearing and terminal box apron, and the rethread frame transmission gives ground.
Preferably, a spring is installed between the conductive bearing and the junction box cover plate, the spring is in a compressed state, and two ends of the spring are respectively attached to the bearing chamber of the junction box cover plate and the conductive bearing.
Preferably, the spring is a wave spring with a plane contact structure, and is in surface contact with the conductive bearing;
the thickness of the wave spring after compression is 3 mm.
Preferably, a groove is formed in the inner side wall of the bearing chamber on the junction box cover plate, an O-shaped ring is arranged in the groove, and the O-shaped ring is in interference fit with the outer ring of the conductive bearing;
the inner ring of the conductive bearing is in interference fit with the rotating shaft, and the outer ring of the conductive bearing is in clearance fit with the bearing chamber.
Preferably, the bearing is an insulating bearing, and the inner diameter of the bearing is 35 mm-40 mm;
the conductive bearing is a non-bearing conductive bearing, and the inner diameter of the conductive bearing is 7mm-8 mm.
Preferably, the conductive bearing is made of conductive grease.
Preferably, the front end cover and the motor inner shell are integrally formed, and the rear end cover and the motor outer shell are integrally formed.
Preferably, the front end cover is provided with a bearing chamber for accommodating one bearing, the inner ring of one bearing is in interference fit with the rotating shaft, and the outer ring is in clearance fit with the bearing chamber;
the rear end cover is provided with a bearing chamber for accommodating the other bearing, the inner ring of the other bearing is in interference fit with the rotating shaft, and the outer ring is in clearance fit with the bearing chamber.
Preferably, the driving motor is a water-cooling motor.
The invention also provides an electric automobile which comprises the driving motor.
The invention has the beneficial effects that:
1) through set up conductive bearing between pivot and terminal box apron, the axle voltage that makes the pivot produce transmits for the frame through conductive bearing and terminal box apron, and ground is transmitted to the rethread frame, has reduced the charge accumulation at bearing both ends, has effectively avoided the electric corrosion of axle voltage to bearing to avoid motor bearing to produce the electric corrosion trouble, promoted the reliability of motor. The problem of electric corrosion of the motor bearing of the existing electric automobile is solved, and the problem of high production cost can be solved;
2) the spring is arranged between the conductive bearing and the junction box cover plate and provides a certain pretightening force for the conductive bearing, so that the vibration generated by the rotation of the outer ring of the conductive bearing is reduced, and the stability of the motor is improved;
3) the spring is designed into the wave spring with a plane contact structure, so that the spring is in surface contact with the conductive bearing, the contact resistance between the conductive bearing and the wave spring is effectively reduced, the transmission speed of current is improved, and meanwhile, the pre-tightening force of the wave spring on the conductive bearing is reduced by adjusting the working height (namely the thickness after compression) of the conventional wave spring to 3mm, so that the damage of the friction force between the wave spring and the conductive bearing on the conductive bearing is reduced, and the service life of the conductive bearing is prolonged;
4) the groove is formed in the inner side wall of the bearing chamber on the junction box cover plate, and the O-shaped ring is arranged in the groove, so that the O-shaped ring is in interference fit with the outer ring of the conductive bearing, and the vibration of the outer ring of the conductive bearing is further reduced;
5) the bearing is set as an insulating bearing, so that a shaft voltage path is further cut off, and the problem of electric corrosion of a motor bearing is solved; meanwhile, the conductive bearing is set to be a non-bearing conductive bearing, the inner diameter of the conductive bearing is 7mm-8mm, and the size of the conductive bearing is far smaller than that of the bearing, so that the transmission efficiency of voltage is ensured, and the conductive bearing has the advantage of low cost and has popularization and application values in the technical field of automobile accessories.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural view of a conductive bearing;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a schematic structural view of a wave spring;
fig. 6 is a top view of fig. 5.
Wherein, 1-a rotating shaft; 2-front end cover; 3-rear end cap; 4- -terminal box cover plate; 5-a load bearing; 6-a conductive bearing; 7-a spring; 8-O-shaped ring.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure herein, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings and preferred embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1 to 6, a driving motor, including a rotating shaft 1, a front end cover 2, a rear end cover 3 and a terminal box cover plate 4, two ends of the rotating shaft 1 are respectively installed on the front end cover 2 and the rear end cover 3 through a bearing 5, the outer side of the rear end cover 3 is connected with the terminal box cover plate 4, a bearing chamber is arranged on the terminal box cover plate 4, a conductive bearing 6 is installed in the bearing chamber, the rotating shaft 1 is in interference fit with the conductive bearing 6, the terminal box cover plate 4 is used for being connected with a vehicle frame, so that a shaft voltage generated by the rotating shaft 1 is transmitted to the vehicle frame through the conductive bearing 6 and the terminal box cover plate 4, and then transmitted to the ground through the vehicle frame.
Through set up conductive bearing between pivot and terminal box apron, the axle voltage that makes the pivot produce transmits for the frame through conductive bearing and terminal box apron, and ground is transmitted to the rethread frame, has reduced the charge accumulation at bearing both ends, has effectively avoided the electric corrosion of axle voltage to bearing to avoid motor bearing to produce the electric corrosion trouble, promoted the reliability of motor. The problem of current electric automobile's motor bearing have the galvanic corrosion is solved, can also solve high in production cost's problem.
A spring 7 is arranged between the conductive bearing 6 and the junction box cover plate 4, the spring 7 is in a compressed state, and two ends of the spring are respectively attached to the bearing chamber of the junction box cover plate 4 and the conductive bearing 6.
Through set up the spring between conductive bearing and terminal box apron, the spring provides certain pretightning force for conductive bearing, has reduced conductive bearing outer lane and has rotated and produce the vibration, has improved the stability of motor.
The spring 7 is a wave spring with a plane contact structure and is in surface contact with the conductive bearing 4;
the compressed thickness of the wave spring 5 is 3 mm.
Through establishing the wave spring into the plane contact structure with the spring for be surface contact between it and the conductive bearing, effectively reduced the contact resistance between conductive bearing and the wave spring, improved the transmission speed of electric current, simultaneously, through the working height (the thickness after compressing promptly) adjustment with current wave spring for 3mm, reduced wave spring to the pretightning force of conductive bearing, thereby reduced the damage of frictional force between wave spring and the conductive bearing to conductive bearing, prolonged conductive bearing's life.
In the prior art, the working height (namely the thickness after compression) of the wave spring connected with the common bearing is 2mm, although the pre-tightening force of the wave spring on the common bearing is larger, the bearing is damaged at the same time, and the service life is shortened.
A groove is formed in the inner side wall of the bearing chamber on the junction box cover plate 4, an O-shaped ring 8 is arranged in the groove, and the O-shaped ring 8 is in interference fit with the outer ring of the conductive bearing 6;
the inner ring of the conductive bearing 6 is in interference fit with the rotating shaft 1, and the outer ring is in clearance fit with the bearing chamber.
The groove is formed in the inner side wall of the bearing chamber on the junction box cover plate, and the O-shaped ring is arranged in the groove, so that the O-shaped ring is in interference fit with the outer ring of the conductive bearing, and the vibration of the outer ring of the conductive bearing is further reduced.
In this embodiment, in order to reduce the damage of frictional force to conductive bearing, the operating height (thickness after compressing promptly) adjustment of wave spring is for 3mm to also reduced the pretightning force of wave spring to conductive bearing, but through setting up O type circle after, O type circle produces certain pretightning force to conductive bearing, thereby reduces the vibration of conductive bearing outer lane through O type circle and wave spring combined action, but the pretightning force has obtained effective dispersion, has reduced the damage to conductive bearing.
The bearing 5 is an insulating bearing, and the inner diameter of the bearing is 35 mm-40 mm;
the conductive bearing 6 is a non-bearing conductive bearing, and the inner diameter of the conductive bearing is 7mm-8 mm.
The bearing is set as an insulating bearing, so that a shaft voltage path is further cut off, and the problem of electric corrosion of a motor bearing is solved; meanwhile, the conductive bearing is set to be a non-bearing conductive bearing, the inner diameter of the conductive bearing is 7mm-8mm, and the size of the conductive bearing is far smaller than that of the bearing, so that the transmission efficiency of voltage is ensured, and meanwhile, the conductive bearing has the advantage of low cost.
In the actual research and development process, one of the bearing bearings is set as a conductive bearing, so that the conductive bearing has both a conductive function and a bearing function, but the size of the bearing is large, so that the resistance is large, the transmission efficiency of voltage is low, and the electric corrosion problem of the bearing cannot be effectively improved.
The conductive bearing 6 is made of conductive grease.
The conductive bearing is made of the conductive grease, so that the transmission efficiency of the shaft voltage is further improved.
The front end cover 2 and the motor inner shell are integrally formed, and the rear end cover 3 and the motor outer shell are integrally formed.
The front end cover 2 is provided with a bearing chamber for accommodating a bearing 5, the inner ring of the bearing 5 is in interference fit with the rotating shaft 1, and the outer ring is in clearance fit with the bearing chamber;
the rear end cover 3 is provided with a bearing chamber for accommodating another bearing 5, the inner ring of the other bearing 5 is in interference fit with the rotating shaft 1, and the outer ring is in clearance fit with the bearing chamber.
The driving motor is a water-cooling motor.
The embodiment also provides an electric automobile which comprises the driving motor in the embodiment.
According to the driving motor and the electric automobile, firstly, the conductive bearing is arranged between the rotating shaft and the junction box cover plate, so that shaft voltage generated by the rotating shaft is transmitted to the frame through the conductive bearing and the junction box cover plate and then transmitted to the ground through the frame, the charge accumulation at two ends of the bearing is reduced, the electric corrosion of the shaft voltage to the bearing is effectively avoided, the electric corrosion fault of the bearing of the motor is avoided, and the reliability of the motor is improved. The problem of electric corrosion of the motor bearing of the existing electric automobile is solved, and the problem of high production cost can be solved; secondly, a spring is arranged between the conductive bearing and the junction box cover plate and provides a certain pretightening force for the conductive bearing, so that the vibration generated by the rotation of an outer ring of the conductive bearing is reduced, and the stability of the motor is improved; thirdly, the spring is designed into the wave spring with a plane contact structure, so that the spring is in surface contact with the conductive bearing, the contact resistance between the conductive bearing and the wave spring is effectively reduced, the transmission speed of current is improved, meanwhile, the working height (namely the thickness after compression) of the existing wave spring is adjusted to be 3mm, the pre-tightening force of the wave spring on the conductive bearing is reduced, the damage of the friction force between the wave spring and the conductive bearing on the conductive bearing is reduced, and the service life of the conductive bearing is prolonged; fourthly, a groove is formed in the inner side wall of the bearing chamber on the junction box cover plate, and an O-shaped ring is arranged in the groove, so that the O-shaped ring is in interference fit with the outer ring of the conductive bearing, and the vibration of the outer ring of the conductive bearing is further reduced; finally, the bearing is set as an insulating bearing, so that a shaft voltage path is further cut off, and the problem of electric corrosion of a motor bearing is solved; meanwhile, the conductive bearing is set to be a non-bearing conductive bearing, the inner diameter of the conductive bearing is 7mm-8mm, and the size of the conductive bearing is far smaller than that of the bearing, so that the transmission efficiency of voltage is ensured, and the conductive bearing has popularization and application values in the technical field of automobile accessories.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention.
Claims (10)
1. The utility model provides a driving motor, includes pivot (1), front end housing (2), rear end housing (3) and terminal box apron (4), install on front end housing (2) and rear end housing (3) through bearing (5) respectively at the both ends of pivot (1), and terminal box apron (4) are connected in the outside of rear end housing (3), its characterized in that, set up the bearing room on terminal box apron (4), install conductive bearing (6) in it, pivot (1) and conductive bearing (6) interference fit, terminal box apron (4) are used for linking to each other with the frame, and the axle voltage that makes pivot (1) produce transmits for the frame through conductive bearing (6) and terminal box apron (4), and ground is given in the rethread frame transmission.
2. The drive motor according to claim 1, characterized in that a spring (7) is mounted between the conductive bearing (6) and the terminal block cover plate (4), the spring (7) being in a compressed state, both ends of which are respectively attached to the bearing chamber of the terminal block cover plate (4) and the conductive bearing (6).
3. The drive motor according to claim 2, wherein the spring (7) is a wave spring of a planar contact type structure, and is in surface contact with the conductive bearing (6);
the thickness of the wave spring after compression is 3 mm.
4. The drive motor according to claim 2, wherein the inner side wall of the bearing chamber on the terminal box cover plate (4) is provided with a groove, an O-shaped ring (8) is arranged in the groove, and the O-shaped ring (8) is in interference fit with the outer ring of the conductive bearing (6);
the inner ring of the conductive bearing (6) is in interference fit with the rotating shaft (1), and the outer ring is in clearance fit with the bearing chamber.
5. The drive motor according to claim 1, wherein the carrier bearing (5) is an insulating bearing having an inner diameter of 35mm to 40 mm;
the conductive bearing (6) is a non-bearing conductive bearing, and the inner diameter of the conductive bearing is 7mm-8 mm.
6. The drive motor according to claim 1, characterized in that the electrically conductive bearing (6) is made of electrically conductive grease.
7. The drive motor according to claim 1, wherein the front end cover (2) is integrally formed with the motor inner housing, and the rear end cover (3) is integrally formed with the motor outer housing.
8. The drive motor according to claim 7, wherein the front end cover (2) is provided with a bearing chamber for accommodating one of the load bearings (5), an inner ring of the one of the load bearings (5) is in interference fit with the rotating shaft (1), and an outer ring is in clearance fit with the bearing chamber;
the rear end cover (3) is provided with a bearing chamber for accommodating the other bearing (5), the inner ring of the other bearing (5) is in interference fit with the rotating shaft (1), and the outer ring is in clearance fit with the bearing chamber.
9. The drive motor of claim 1, wherein the drive motor is a water cooled motor.
10. An electric vehicle characterized by comprising the drive motor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111566883.9A CN114337121A (en) | 2021-12-20 | 2021-12-20 | Driving motor and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111566883.9A CN114337121A (en) | 2021-12-20 | 2021-12-20 | Driving motor and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114337121A true CN114337121A (en) | 2022-04-12 |
Family
ID=81054851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111566883.9A Pending CN114337121A (en) | 2021-12-20 | 2021-12-20 | Driving motor and electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114337121A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117411249A (en) * | 2023-10-26 | 2024-01-16 | 浙江大学先进电气装备创新中心 | Electric excitation motor capable of avoiding overcurrent damage by utilizing conductive bearing |
| TWI837790B (en) * | 2022-08-25 | 2024-04-01 | 大陸商深圳興奇宏科技有限公司 | Shaft voltage reduction structure applicable to electric machine |
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| CN106357049A (en) * | 2016-11-02 | 2017-01-25 | 常州机电职业技术学院 | Composite motor |
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| CN109194039A (en) * | 2018-09-30 | 2019-01-11 | 广州小鹏汽车科技有限公司 | A kind of motor shaft current eliminates structure and motor |
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| CN212225928U (en) * | 2020-03-19 | 2020-12-25 | 菲仕绿能科技(宁波)有限公司 | Motor and reducer connecting structure for electric vehicle |
| CN212486269U (en) * | 2020-08-11 | 2021-02-05 | 北京科环新源工程技术有限公司 | End cover assembling structure for bearing and wind generating set comprising same |
| CN213185745U (en) * | 2020-08-05 | 2021-05-11 | 福迈医疗科技(佛山)有限公司 | Brushless motor for electric tool |
| CN113346704A (en) * | 2021-06-07 | 2021-09-03 | 银川威马电机有限责任公司 | Permanent magnet synchronous motor and high-power electric mine car using same |
| CN214543908U (en) * | 2020-12-18 | 2021-10-29 | 郑州宇通客车股份有限公司 | Driving motor and vehicle using same |
-
2021
- 2021-12-20 CN CN202111566883.9A patent/CN114337121A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203632426U (en) * | 2013-12-28 | 2014-06-04 | 王必生 | Motor cover device preventing shaft current |
| CN106357049A (en) * | 2016-11-02 | 2017-01-25 | 常州机电职业技术学院 | Composite motor |
| CN107681836A (en) * | 2017-11-24 | 2018-02-09 | 合肥巨动力系统有限公司 | A kind of motor for eliminating bearing galvano-cautery |
| CN109194039A (en) * | 2018-09-30 | 2019-01-11 | 广州小鹏汽车科技有限公司 | A kind of motor shaft current eliminates structure and motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI837790B (en) * | 2022-08-25 | 2024-04-01 | 大陸商深圳興奇宏科技有限公司 | Shaft voltage reduction structure applicable to electric machine |
| CN117411249A (en) * | 2023-10-26 | 2024-01-16 | 浙江大学先进电气装备创新中心 | Electric excitation motor capable of avoiding overcurrent damage by utilizing conductive bearing |
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Application publication date: 20220412 |