CN112510907B - Alternating current rare earth permanent magnet servo motor - Google Patents
Alternating current rare earth permanent magnet servo motor Download PDFInfo
- Publication number
- CN112510907B CN112510907B CN202011368482.8A CN202011368482A CN112510907B CN 112510907 B CN112510907 B CN 112510907B CN 202011368482 A CN202011368482 A CN 202011368482A CN 112510907 B CN112510907 B CN 112510907B
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- motor
- permanent magnet
- rare earth
- alternating current
- servo motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/02—Casings or enclosures characterised by the material thereof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/08—Insulating casings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
- H02K2205/09—Machines characterised by drain passages or by venting, breathing or pressure compensating means
Abstract
The invention discloses an alternating current rare earth permanent magnet servo motor, which relates to the technical field of motors, in particular to an alternating current rare earth permanent magnet servo motor. This exchange tombarthite permanent magnet servo motor, design convenience through the connecting axle is connected driven shaft and motor output shaft, and the convenient to use that utilizes fixed slot and fixed block and connecting strip and compression spring makes motor output shaft and connecting axle fix or separate, has made things convenient for the change of motor axle head, makes the device be convenient for change the axle head after using the production wearing and tearing, and it is long when effectively reducing the change of axle head simultaneously, conveniently carries out the axle head of quick replacement wearing and tearing when using.
Description
Technical Field
The invention relates to the technical field of motors, in particular to an alternating current rare earth permanent magnet servo motor.
Background
The rare earth permanent magnet motor is a novel permanent magnet motor appearing in the early 70 s, and has a series of advantages of small size, light weight, high efficiency, good characteristics and the like due to the high magnetic energy product and the high coercive force of the rare earth permanent magnet. The rare earth permanent magnet motor has a wide application range, and almost extends to various fields of aviation, aerospace, national defense, equipment manufacturing, industrial and agricultural production and daily life. The permanent magnet synchronous motor comprises a permanent magnet synchronous motor, a permanent magnet generator, a direct current motor, a brushless direct current motor, an alternating current permanent magnet servo motor, a permanent magnet linear motor, a special permanent magnet motor and a related control system, and almost covers the whole motor industry.
When current interchange tombarthite permanent magnet servo motor's use, can have some problems, at first when the high-speed rotation of motor when the normal use of motor, can have great load to the pivot of motor, the axle head of motor produces the wearing and tearing back simultaneously, can need to change, need change whole pivot, it is more troublesome, and need unpack whole motor apart, be unfavorable for the normal use of motor, internal failure can appear after the long-time use of current motor, can lead to the electric leakage when serious, if directly overhaul can have some dangers, we propose an interchange tombarthite permanent magnet servo motor for this.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an alternating current rare earth permanent magnet servo motor, which solves the problems in the background technology.
In order to achieve the purpose, the invention is realized by the following technical scheme: an alternating current rare earth permanent magnet servo motor comprises a motor, wherein a rubber protective shell is fixedly sleeved outside the motor, a radiating net is arranged outside the rubber protective shell, a lead is fixedly connected above the motor, an alarm device is fixedly mounted above the rubber protective shell, the top end of the lead is fixedly connected with the alarm device, a motor output shaft is fixedly mounted inside the motor, a connecting groove is formed in the right side of the motor output shaft, a fixing groove is formed in the outer side of the motor output shaft, fixing blocks are interactively sleeved inside the fixing groove, a connecting strip is fixedly connected to the bottom of each fixing block, a connecting ring is movably sleeved inside the right side of each connecting groove, a compression spring is fixedly mounted inside each connecting ring, a connecting shaft is fixedly connected to the right side of each connecting ring, threads are formed in the inner side of each connecting shaft, the utility model discloses a motor, including connecting axle, connecting shaft, motor, outer grip ring, adjusting bolt, connecting shaft, the inboard of connecting shaft has the spliced pole through the fixed cover of screw thread, the left side fixed mounting of spliced pole has the fixed column, the left side fixedly connected with of fixed column pushes away the awl, the right side fixedly connected with driven shaft of spliced pole, the right side fixed mounting of motor has outer grip ring, the inboard fixed mounting of outer grip ring has the connection piece, the inboard of connection piece has cup jointed the telescopic link through the bearing activity, the outside activity of driven shaft has cup jointed interior grip ring, adjusting bolt has been cup jointed in the outside activity of telescopic link.
Optionally, the wire extends from above the motor to the outside of the rubber protective shell through a heat dissipation mesh adapted to the wire.
Optionally, twelve fixed grooves are formed in the outer portion of the motor output shaft, and the fixed grooves are formed in the outer portion of the connecting groove, so that the inner portion of the connecting groove is communicated with the outer portion through the fixed grooves.
Optionally, the connecting bar extends to the right to the inside of the connecting ring, and the connecting bar is fixedly connected with the connecting ring through a compression spring.
Optionally, the outer side of the connecting column is provided with a thread, and the diameter value of the connecting column is larger than that of the fixing column.
Optionally, the pushing cone is conical, the diameter value of the right side of the pushing cone is larger than that of the left side of the pushing cone, and the diameter value of the right side of the pushing cone is the same as that of the fixed column.
Optionally, the outer portion of the inner clamping ring is fixedly connected with a connecting sheet, and the right end of the telescopic rod is movably connected with the connecting sheet through a bearing.
The invention provides an alternating current rare earth permanent magnet servo motor which has the following beneficial effects:
1. this exchange tombarthite permanent magnet servo motor, design convenience through the connecting axle is connected driven shaft and motor output shaft, the convenient to use that utilizes fixed slot and fixed block and connecting strip and compression spring makes motor output shaft and connecting axle fix or separate, make things convenient for the dismouting, the cooperation through screw thread and spliced pole simultaneously makes driven shaft and connecting axle carry out dismouting or separation, the change of motor axle head has been made things convenient for, make the device be convenient for after the use produces wearing and tearing change axle head, it is long when effectively reducing the change of axle head simultaneously, conveniently carry out the axle head of quick replacement wearing and tearing when using.
2. This exchange tombarthite permanent magnet servo motor, through the outer grip ring of right side design at the motor, the inside that makes outer grip ring is connected with the telescopic link through the connection piece, grip ring in the other end of telescopic link passes through the connection piece installation, grip ring carries out the fixed of motor work axle head in the convenient utilization, prevents the wearing and tearing of motor axle head, is unfavorable for the long-time use of motor shaft, can little increase motor shaft's life, the life-span of messenger's device obtains effectual promotion.
3. This exchange tombarthite permanent magnet servo motor, there is the rubber protective housing through the externally mounted at the motor, the radiator-grid has been seted up to the utilization in the inside of rubber protective housing, make the wire connect in the top of motor, make the wire pass the radiator-grid and upwards extend to the top of rubber protective housing and be connected with alarm device, after the long-time use of motor, the condition of inside wearing and tearing appears, lead to the motor electric leakage, can prevent the mistake through the rubber protective housing and touch, alarm device can produce the police dispatch newspaper simultaneously, the setting of radiator-grid is convenient for ventilate.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a protective shell according to the present invention;
FIG. 3 is a schematic structural view of a connecting shaft according to the present invention;
FIG. 4 is a schematic structural view of the motor output shaft and the driven shaft connecting driving assembly of the present invention;
FIG. 5 is a schematic view of the outer clamp ring of the present invention.
In the figure: 1. an electric motor; 2. a rubber protective shell; 3. a heat-dissipating web; 4. a wire; 5. an output shaft of the motor; 6. connecting grooves; 7. fixing grooves; 8. a fixed block; 9. a connecting strip; 10. a compression spring; 11. a connecting ring; 12. a connecting shaft; 13. a thread; 14. pushing the cone; 15. fixing a column; 16. connecting columns; 17. a driven shaft; 18. an outer clamp ring; 19. connecting sheets; 20. a telescopic rod; 21. adjusting the bolt; 23. an inner clamping ring; 24. an alarm device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 5, the present invention provides a technical solution: an alternating current rare earth permanent magnet servo motor comprises a motor 1, a rubber protective shell 2 is fixedly sleeved outside the motor 1, a radiating net 3 is arranged outside the rubber protective shell 2, a lead 4 is fixedly connected above the motor 1, the lead 4 penetrates through the radiating net 3 from the upper side of the motor 1 and extends to the outside of the rubber protective shell 2, the radiating net 3 is matched with the lead 4, the rubber protective shell 2 mainly plays a role of safety protection, the working personnel are protected after electric leakage through the design of the rubber protective shell 2, the radiating net 3 mainly plays a role of ventilation, more heat can be emitted in the operation process of the motor 1, the heat generated by the motor 1 can be conveniently emitted into the air through the radiating net 3, the motor 1 can conveniently exchange heat with the air, and the lead 4 extends out through the radiating net 3, the alarm device 24 is convenient to alarm when running, the alarm device 24 is fixedly arranged above the rubber protective shell 2, the top end of the wire 4 is fixedly connected with the alarm device 24, the motor output shaft 5 is fixedly arranged inside the motor 1, the connecting groove 6 is formed in the right side of the motor output shaft 5, the fixing groove 7 is formed in the outer side of the motor output shaft 5, twelve fixing grooves 7 are formed in the outer side of the motor output shaft 5, the fixing grooves 7 are formed in the outer side of the connecting groove 6, the inner portion of the connecting groove 6 is communicated with the outer portion through the fixing grooves 7, the fixing grooves 7 are formed by the fixing grooves 7 to facilitate the fixing block 8 to rotate, stress of the fixing block 8 is reduced, meanwhile, the connecting shaft 12 and the motor output shaft 5 are conveniently fixed due to the design of the connecting groove 6 and the fixing grooves 7, the device is conveniently connected with the connecting ring 11 due to the formation of the connecting groove 6, and the fixing grooves 7 play a role of fixing the fixing block 8, through the action of the fixed groove 7 and the connecting groove 6, the connection with the connecting shaft 12 is convenient, the fixed block 8 is interactively sleeved inside the fixed groove 7, the connecting strip 9 is fixedly connected to the bottom of the fixed block 8, the connecting ring 11 is movably sleeved inside the right side of the connecting groove 6, the compression spring 10 is fixedly installed on the inner side of the connecting ring 11, the connecting strip 9 extends to the right inside of the connecting ring 11, the connecting strip 9 is fixedly connected with the connecting ring 11 through the compression spring 10, the compression spring 10 can be in an extending state in a normal state, the connecting strip 9 can form a small circle in the state of the compression spring 10, the diameter value of the fixed block 8 can be the same as that of the connecting ring 11, when the connecting strip 9 is pressed outwards by the fixed column 15, the connecting strip 9 can drive the fixed block 8 to be clamped inside the fixed groove 7, the connection between the fixed groove 7 and the fixed block 8 is convenient, and the connecting strip 9 is connected with the connecting ring 11 through the compression spring 10, the connection between the fixed block 8 and the connection ring 11 is facilitated, the right side of the connection ring 11 is fixedly connected with a connection shaft 12, the inner side of the connection shaft 12 is provided with a thread 13, the inner side of the connection shaft 12 is fixedly sleeved with a connection column 16 through the thread 13, the outer side of the connection column 16 is provided with the thread 13, the diameter value of the connection column 16 is larger than that of a fixed column 15, the fixed column 15 plays a role of expanding the connection strip 9, when in use, the fixed column 15 is clamped towards the inside of the connection strip 9, the connection strip 9 extrudes a compression spring 10, the diameter of a circle supported by the connection strip 9 is enlarged, the connection strip 9 drives the fixed block 8 to be clamped towards the inside of a fixed groove 7, the fixed block 8 and the fixed groove 7 are fixed, the fixed column 15 is fixedly installed on the left side of the connection column 16, the left side of the fixed column 15 is fixedly connected with a push cone 14, the push cone 14 is conical, the diameter value on the right side of the push cone 14 is larger than that on the left side, the diameter value of the right side of the pushing cone 14 is the same as that of the fixed column 15, the motor 1 is inserted into the connecting groove 6 on the right side of the motor output shaft 5, the fixed block 8 is located on the inner side of the fixed groove 7, then the driven shaft 17 moves towards the left side of the connecting shaft 12 through the connecting shaft 12 and the connecting column 16 from the right side of the connecting shaft 12 under the matching of the threads 13, the connecting strip 9 is outwards spread by the pushing cone 14 and the fixed column 15, the connecting strip 9 can drive the fixed block 8 to move towards the inside of the fixed groove 7, the fixed block 8 is clamped with the fixed groove 7 to complete the fixation of the shaft end, the driven shaft 17 is fixedly connected to the right side of the connecting column 16, the outer clamping ring 18 is fixedly installed on the right side of the motor 1, the connecting sheet 19 is fixedly installed on the inner side of the outer clamping ring 18, the telescopic rod 20 is movably sleeved on the inner side of the connecting sheet 19 through a bearing, the inner clamping ring 23 is movably sleeved on the outer part of the driven shaft 17, adjusting bolt 21 has been cup jointed in telescopic link 20's outside activity, the outside fixedly connected with connection piece 19 of interior grip ring 23, bearing and 19 swing joint of connection piece are passed through to telescopic link 20's right-hand member, adjust bolt 21 unscrews when using, make telescopic link 20 be in tensile state, move interior grip ring 23 to driven shaft 17's right side afterwards, grip ring 23 removes the outside to driven shaft 17 in making, it fixes to twist dead adjusting bolt 21's length that makes telescopic link 20 afterwards, can fix driven shaft 17 through interior grip ring 23, the convenience supports the wearing and tearing that prevent the axle head to the axle head, lead to the device to need frequent change axle head.
In conclusion, when the alternating current rare earth permanent magnet servo motor is used, firstly, the motor 1 is inserted into the connecting groove 6 on the right side of the motor output shaft 5, the fixed block 8 is positioned on the inner side of the fixed groove 7, then the driven shaft 17 passes through the connecting shaft 12 and the connecting column 16 from the right side of the connecting shaft 12, moves towards the left side of the connecting shaft 12 under the matching of the screw thread 13, the pushing cone 14 and the fixed column 15 are used for expanding the connecting strip 9 outwards, the connecting strip 9 can drive the fixed block 8 to move towards the inner part of the fixed groove 7, the fixed block 8 is clamped with the fixed groove 7, then after the driven shaft 17 is screwed to be in contact with the connecting shaft 12, the adjusting bolt 21 can be stopped, the adjusting bolt 21 is unscrewed, the telescopic rod 20 is in a loosening state, then the inner clamping ring 23 moves towards the right, the inner clamping ring 23 is moved to the outer part of the driven shaft 17, then the telescopic rod 20 is in a stretching state, and the adjusting bolt 21 is unscrewed, make telescopic link 20's length fixed, the starter motor, make driven shaft 17 be connected with the foreign object, make motor output shaft 5's rotation, drive the rotation of fixed block 8 through fixed slot 7, fixed block 8 drives connecting axle 12 and rotates, connecting axle 12 can drive driven shaft 17 and rotate, it is fixed to carry out the centre gripping to driven shaft 17 through interior grip ring 23, if long-time use when using, can lead to inside wearing and tearing, easily lead to the device electric leakage, can prevent staff and motor direct contact through rubber protecting crust 2, motor 1 passes through wire 4 transmission to alarm device 24 with the electric current when the electric leakage, make alarm device 24 carry out the police dispatch newspaper, can.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. An alternating current rare earth permanent magnet servo motor comprises a motor (1), and is characterized in that: the rubber protective shell (2) is fixedly sleeved outside the motor (1), the radiating net (3) is arranged outside the rubber protective shell (2), a lead (4) is fixedly connected to the upper portion of the motor (1), an alarm device (24) is fixedly mounted on the upper portion of the rubber protective shell (2), the top end of the lead (4) is fixedly connected with the alarm device (24), a motor output shaft (5) is fixedly mounted inside the motor (1), a connecting groove (6) is formed in the right side of the motor output shaft (5), a fixing groove (7) is formed in the outer side of the motor output shaft (5), a fixing block (8) is sleeved inside the fixing groove (7) in an interactive mode, a connecting strip (9) is fixedly connected to the bottom of the fixing block (8), and a connecting ring (11) is sleeved inside the right side of the connecting groove (6), the compression spring (10) is fixedly mounted on the inner side of the connecting ring (11), the connecting shaft (12) is fixedly connected to the right side of the connecting ring (11), threads (13) are formed in the inner side of the connecting shaft (12), a connecting column (16) is fixedly sleeved on the inner side of the connecting shaft (12) through the threads (13), a fixing column (15) is fixedly mounted on the left side of the connecting column (16), a pushing cone (14) is fixedly connected to the left side of the fixing column (15), a driven shaft (17) is fixedly connected to the right side of the connecting column (16), an outer clamping ring (18) is fixedly mounted on the right side of the motor (1), a connecting sheet (19) is fixedly mounted on the inner side of the outer clamping ring (18), a telescopic rod (20) is movably sleeved on the inner side of the connecting sheet (19) through a bearing, and an inner clamping ring (23) is movably sleeved on the outer side of the driven shaft (17), an adjusting bolt (21) is movably sleeved outside the telescopic rod (20).
2. An alternating current rare earth permanent magnet servo motor according to claim 1, wherein: the lead (4) passes through the heat dissipation net (3) from the upper part of the motor (1) and extends to the outside of the rubber protective shell (2), and the heat dissipation net (3) is adapted to the lead (4).
3. An alternating current rare earth permanent magnet servo motor according to claim 1, wherein: twelve fixed grooves (7) are formed in the outer portion of the motor output shaft (5), the fixed grooves (7) are formed in the outer portion of the connecting groove (6), and the inner portion of the connecting groove (6) is communicated with the outer portion through the fixed grooves (7).
4. An alternating current rare earth permanent magnet servo motor according to claim 1, wherein: the connecting strip (9) extends rightwards to the inside of the connecting ring (11), and the connecting strip (9) is fixedly connected with the connecting ring (11) through a compression spring (10).
5. An alternating current rare earth permanent magnet servo motor according to claim 1, wherein: the outer side of the connecting column (16) is provided with a thread (13), and the diameter value of the connecting column (16) is larger than that of the fixing column (15).
6. An alternating current rare earth permanent magnet servo motor according to claim 1, wherein: the pushing cone (14) is conical, the diameter value of the right side of the pushing cone (14) is larger than that of the left side of the pushing cone, and the diameter value of the right side of the pushing cone (14) is the same as that of the fixed column (15).
7. An alternating current rare earth permanent magnet servo motor according to claim 1, wherein: the outer portion of the inner clamping ring (23) is fixedly connected with a connecting sheet (19), and the right end of the telescopic rod (20) is movably connected with the connecting sheet (19) through a bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011368482.8A CN112510907B (en) | 2020-11-30 | 2020-11-30 | Alternating current rare earth permanent magnet servo motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011368482.8A CN112510907B (en) | 2020-11-30 | 2020-11-30 | Alternating current rare earth permanent magnet servo motor |
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| Publication Number | Publication Date |
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| CN112510907A CN112510907A (en) | 2021-03-16 |
| CN112510907B true CN112510907B (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011368482.8A Active CN112510907B (en) | 2020-11-30 | 2020-11-30 | Alternating current rare earth permanent magnet servo motor |
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| CN (1) | CN112510907B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112865412B (en) * | 2021-04-13 | 2023-08-04 | 江苏嘉瑞丰机电设备有限公司 | Permanent magnet slotless motor |
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| CN111162628A (en) * | 2020-01-17 | 2020-05-15 | 耿思宇 | Improved motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2628488B1 (en) * | 1988-03-14 | 1990-12-28 | Ecia Equip Composants Ind Auto | QUICK ATTACHMENT OF THE IMPROVED BAYONET TYPE |
| CH680303A5 (en) * | 1990-02-16 | 1992-07-31 | Syma Intercontinental Sa | |
| JP4651056B2 (en) * | 2008-10-28 | 2011-03-16 | 日本航空電子工業株式会社 | Adapter device |
| CN202560852U (en) * | 2012-03-26 | 2012-11-28 | 中国核电工程有限公司 | Shaft coupling capable of being rapidly mounted and dismounted |
| US9360035B2 (en) * | 2014-01-13 | 2016-06-07 | Jeffrey D. Carnevali | Rod-to-tube adapter |
| CN106931048B (en) * | 2017-04-25 | 2023-07-14 | 中冶华天工程技术有限公司 | Rotary clutch device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100898961B1 (en) * | 2009-01-07 | 2009-05-25 | 미래테크(주) | A connector for square pipe |
| CN206678541U (en) * | 2017-04-06 | 2017-11-28 | 嵊州市创汇纺织机械有限公司 | A kind of detachable roller of textile machinery |
| CN209503962U (en) * | 2018-12-17 | 2019-10-18 | 武义县盛隆金属制品有限公司 | A kind of electric ratchet wrench |
| CN110048581A (en) * | 2019-05-25 | 2019-07-23 | 马闪 | A kind of stepper motor preventing eccentric operating |
| CN111162628A (en) * | 2020-01-17 | 2020-05-15 | 耿思宇 | Improved motor |
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| CN112510907A (en) | 2021-03-16 |
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