CN114640218B - Brushless motor and manufacturing method of coil thereof - Google Patents
Brushless motor and manufacturing method of coil thereof Download PDFInfo
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- CN114640218B CN114640218B CN202210533855.5A CN202210533855A CN114640218B CN 114640218 B CN114640218 B CN 114640218B CN 202210533855 A CN202210533855 A CN 202210533855A CN 114640218 B CN114640218 B CN 114640218B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/08—Forming windings by laying conductors into or around core parts
- H02K15/085—Forming windings by laying conductors into or around core parts by laying conductors into slotted stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- 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
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
Abstract
The invention provides a brushless motor and a manufacturing method of a coil thereof, relating to the field of motors and comprising a shell, a stator structure and a rotor structure; a cavity is arranged in the shell; the stator structure is inserted in the shell and is connected with the shell in a sliding way; the rotor structure is arranged in the stator structure; the rotor structure comprises a permanent magnet, an axle center, fan blades and a heat dissipation assembly, wherein one end of the axle center penetrates through the permanent magnet and one side surface of the shell, the other end of the axle center penetrates through the other side surface of the shell, and the axle center is rotatably connected with the shell; the heat dissipation assembly and the fan blades are arranged on the shaft center and in the cavity, and the heat dissipation assembly is abutted to the stator structure; the axle center is used for driving the fan blades to rotate. The invention solves the problem of poor heat dissipation effect of the traditional motor and has the advantages of simple structure and low manufacturing cost.
Description
Technical Field
The invention relates to the field of motors, in particular to a brushless motor and a manufacturing method of a coil of the brushless motor.
Background
The traditional motor is structurally generally composed of a shell, a stator, a rotor, a permanent magnet and a driving shaft, an end cover is fixed at one end of the shell, the traditional motors can only naturally radiate heat through a ventilation opening in the end cover, the radiating effect is poor, the motor is easy to overheat, the highest power cannot be output all the time, and the service life of the motor is shortened.
Disclosure of Invention
Based on the above, in order to solve the problem of poor heat dissipation effect of the traditional motor, the invention provides a brushless motor, which has the following specific technical scheme:
a brushless motor comprises
The shell is internally provided with a cavity;
the stator structure is inserted into the shell and arranged in the cavity; and
the rotor structure is arranged in the stator structure and comprises a permanent magnet, an axle center, fan blades and a heat dissipation assembly, one end of the axle center penetrates through one side face of the permanent magnet and one side face of the shell, the other end of the axle center penetrates through the other side face of the shell, the axle center is rotatably connected with the shell, the heat dissipation assembly and the fan blades are both arranged on the axle center and are both arranged in the cavity, the heat dissipation assembly is abutted against the stator structure, and the axle center is used for driving the fan blades to rotate;
the stator structure comprises a first framework, an iron core, a coil and a second framework; the iron core is inserted into the first framework, and the second framework is inserted into the iron core; the first framework comprises a first sleeve and a plurality of first fixing blocks; the first fixed blocks are arranged on the outer peripheral side of the first sleeve at intervals around the central axis of the first sleeve; the iron core is inserted into the first sleeve; the first sleeve is matched with the first fixing blocks to form a plurality of first grooves; the second framework comprises a second sleeve and a plurality of second fixing blocks; the second fixed blocks are arranged on the inner surface of the second sleeve at intervals around the central axis of the second sleeve; the second sleeve is inserted into the iron core; the second sleeve is matched with the second fixing blocks to form a plurality of second grooves, and the first grooves and the second grooves are arranged oppositely; the coil sequentially passes through the first groove and the second groove and is sleeved on the outer surfaces of the first framework, the iron core and the second framework.
The fan blades are driven to rotate through the axis of the brushless motor, so that an air channel is generated, heat of the stator structure is taken away through the air channel, cooling is achieved, overheating inside the brushless motor is avoided, the power of the brushless motor is reduced, and the output power is influenced; through being provided with first fixed block and second fixed block and coil and passing through in proper order first groove with the second groove avoids adjacent coil contact, leads to the heat to pile up, and then the motor is overheated, influences the motor life-span. This brushless motor has solved the poor problem of traditional motor radiating effect.
Furthermore, a plurality of U-shaped channels which are sequentially communicated are embedded in the side wall of the shell, and the U-shaped channels are used for cooling liquid to circulate; a liquid inlet and a liquid outlet are arranged on the outer surface of the side wall of the shell; the liquid inlet and the liquid outlet are communicated with the U-shaped channel.
Further, this brushless motor still including locating the water pump outside the casing, the output of water pump with the inlet intercommunication, the input of water pump with the liquid outlet intercommunication, the water pump is used for driving the coolant liquid in U type passageway inner loop.
Further, the heat dissipation assembly comprises a connecting block, a partition plate and a third sleeve made of iron; a guide block with an L-shaped outer contour is arranged in the third sleeve; the guide block is connected with the inner surface of the third sleeve; the third sleeve is arranged on one side face of the stator structure, the connecting block is inserted into the third sleeve, the partition plate is inserted into the connecting block, and the axis sequentially penetrates through the third sleeve, the connecting block, the partition plate and the fan blades.
Furthermore, the outer contour of the connecting block is arranged in a tubular shape, and the inner surface of the connecting block is provided with a guide block for the guide block to pass through; the inner surface of the connecting block is also provided with a cushion block; the partition plate is inserted into the connecting block and abutted against the cushion block; the baffle plate is provided with a notch for the guide block to pass through; the baffle plate is further provided with a protruding block, the axis of the protruding block penetrates through the axis of the baffle plate, and the protruding block is abutted to the fan blades.
Furthermore, the two side faces of the shell, which are rotatably connected by the axis, are provided with ventilation openings, and the ventilation openings are communicated with the cavity.
The invention also discloses a method for manufacturing the coil of the brushless motor, which comprises the following steps
S1, winding a coil along the outer surfaces of the first framework, the iron core and the second framework;
s2, enabling the wound coil to pass through a first groove and a second groove, and pressurizing the coil to form a wound body;
s3, a primary covering procedure, namely forming a primary covering layer in a manner of covering the winding body;
and S4, a secondary covering procedure, namely forming a secondary covering layer in a mode of covering the primary covering layer.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is an exploded view of a brushless motor according to an embodiment of the present invention;
fig. 2 is an exploded view of a housing of a brushless motor according to an embodiment of the present invention;
fig. 3 is a partial cross-sectional view of a housing of a brushless motor according to an embodiment of the present invention;
fig. 4 is a second partial sectional view of a housing of a brushless motor according to an embodiment of the present invention;
fig. 5 is an exploded view of a stator structure of a brushless motor according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a rotor structure of a brushless motor according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a stator structure of a brushless motor according to an embodiment of the present invention;
fig. 8 is a sectional view of a housing of a brushless motor according to an embodiment of the present invention.
Description of reference numerals:
1-a shell; 2-a stator structure; 21-a first backbone; 211-a first sleeve; 212-a first fixed block; 22-a core; 23-a second backbone; 231-a second sleeve; 232-a second fixed block; 3-a rotor structure; 31-permanent magnet blocks; 32-axis center; 33-a heat sink assembly; 331-connecting block; 332-fan blades; 333-partition plate; 334-a third sleeve; 34-a coil; 4-a guide block; 5-a guide block; 6-cushion block; 7-notch; 8-a protruding block; 9-a vent; a 10-U-shaped channel; 11-a water inlet; 12-a water outlet; 13-a lid; 14-a first bearing; 15-second bearing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terms "first" and "second" as used herein do not denote any particular order or quantity, but rather are used to distinguish one element from another.
As shown in fig. 1, fig. 5, fig. 6 and fig. 7, a brushless motor according to an embodiment of the present invention includes a housing 1, a stator structure 2 and a rotor structure 3; a cavity is arranged in the shell 1; the stator structure 2 is inserted into the shell 1 and is connected with the shell in a sliding manner; the rotor structure 3 is arranged in the stator structure 2; the rotor structure 3 comprises a permanent magnet 31, an axle center 32, fan blades 332 and a heat dissipation assembly 33, wherein one end of the axle center 32 penetrates through the permanent magnet 31 and one side surface of the shell 1, the other end of the axle center 32 penetrates through the other side surface of the shell 1, and the axle center 32 is rotatably connected with the shell 1; the heat dissipation assembly 33 and the fan blades 332 are both sleeved on the shaft center 32 and are both arranged in the cavity, and the heat dissipation assembly 33 is abutted against the stator structure 2; the shaft 32 is used for driving the fan blades 332 to rotate; the stator structure 2 comprises a first framework 21, an iron core 22 and a second framework 23; the iron core 22 is inserted into the first framework 21, and the second framework 23 is inserted into the iron core 22; the first framework 21 comprises a first sleeve 211 and a plurality of first fixing blocks 212; the first fixing blocks 212 are arranged on the outer peripheral side of the first sleeve 211 at intervals around the central axis of the first sleeve 211; the iron core 22 is inserted into the first sleeve 211; the first sleeve 211 and the first fixing blocks 212 are matched to form a plurality of first grooves; the second framework 23 comprises a second sleeve 231 and a plurality of second fixing blocks 232; the second fixing blocks 232 are arranged on the inner surface of the second sleeve 231 at intervals around the central axis of the second sleeve 231; the second sleeve 231 is inserted into the iron core 22; the second sleeve 231 and the second fixing blocks 232 are matched to form a plurality of second grooves, and the first grooves and the second grooves are oppositely arranged; the stator structure 2 further includes a coil 34, wherein the coil 34 sequentially passes through the first slot and the second slot and is sleeved on the outer surfaces of the first framework 21, the iron core 22 and the second framework 23.
The brushless motor drives the fan blades 332 to rotate through the shaft center 32, so that an air channel is generated, heat of a stator structure is taken away through the air channel, cooling is achieved, and the phenomenon that the power of the brushless motor is reduced and the output power is influenced due to overheating inside the brushless motor is avoided; through being provided with first fixed block 212 and second fixed block 232 and coil 34 and pass through in proper order first groove with the second groove avoids adjacent coil 34 contact, leads to the heat to pile up, and then the motor is overheated, influences the motor life-span. This brushless motor has solved the poor problem of traditional motor radiating effect.
In one embodiment, as shown in fig. 2 to 4, a plurality of U-shaped channels 10 are embedded in the side wall of the housing 1, and the U-shaped channels 10 are sequentially communicated with each other, and the U-shaped channels 10 are used for the circulation of cooling fluid; a liquid inlet and a liquid outlet are arranged on the outer surface of the side wall of the shell 1; the liquid inlet and the liquid outlet are both communicated with the U-shaped channel 10; the brushless motor further comprises a water pump arranged outside the shell, the output end of the water pump is communicated with the liquid inlet, the input end of the water pump is communicated with the liquid outlet, and the water pump is used for driving cooling liquid to circulate in the U-shaped channel 10. So, on heat transfer to casing 1 in the brushless motor, through water pump drive coolant liquid along U type passageway 10 and water pump circulation flow, outside the coolant liquid heat transfer to casing 1 on with casing 1, the realization was dispelled the heat.
In one embodiment, as shown in fig. 1, the heat dissipation assembly 33 includes a connection block 331, a partition 333, and a third sleeve 334 made of iron; a guide block 4 with an L-shaped outer contour is arranged in the third sleeve 334; the guide block 4 is connected with the inner surface of the third sleeve 334; the third sleeve 334 is arranged on one side surface of the stator structure 2, the connecting block 331 is inserted into the third sleeve 334, the partition plate 333 is inserted into the connecting block 331, and the shaft center 32 sequentially penetrates through the third sleeve 334, the connecting block 331, the partition plate 333 and the fan blades 332; the outer contour of the connecting block 331 is tubular, and the inner surface of the connecting block 331 is provided with a guide block 5 for the guide block 4 to pass through; the inner surface of the connecting block 331 is also provided with a cushion block 6; the partition plate 333 is inserted into the connecting block 331 and abuts against the cushion block 6; the partition plate 333 is provided with a notch 7 for the guide block 5 to pass through; the partition plate 333 is further provided with a protruding block 8, the shaft center 32 penetrates through the protruding block 8, and the protruding block 8 is abutted to the fan blades 332. Thus, when the coil 34 is energized, the iron core 22 has magnetism, and then the third sleeve 334 made of iron is adsorbed on the coil 34, and heat on the coil 34 is transferred to the third sleeve 334, so that the heat dissipation area is increased, the heat dissipation effect is improved, the position of the third sleeve 334 is fixed, and the third sleeve 334 is prevented from moving and rotating; when the coil 34 is powered off, the heat dissipation assembly 33 can be detached by dragging the heat dissipation assembly 33 outwards along the axial lead direction of the axial center 32, so that the quick detachment is realized, and the maintenance and the motor maintenance of workers are facilitated; when the coil 34 is energized, the third sleeve 334 is adsorbed on the stator structure 2, and passes through the guide block 5 through the guide block 4, so that the connecting block 331 is prevented from rotating and moving in the motor, and the heat dissipation assembly is prevented from colliding with the rotor structure to cause damage; by arranging the cushion block 6, the partition plate 333 is prevented from approaching the permanent magnet 31 along the axial lead direction of the axial center 32, thereby influencing the rotation of the permanent magnet 31; by providing the protruding block 8, the contact area between the fan blades 332 and the partition 333 is reduced, and the friction force is reduced, thereby improving the output efficiency of the motor.
In one embodiment, as shown in fig. 2 to 4, two side surfaces of the housing 1 rotatably connected to the shaft center 32 are provided with vents 9, and the vents 9 are communicated with the cavity. In this way, the fan blades 332 rotate and suck the outside air from one ventilation opening 9 and discharge the outside air from the other ventilation opening 9, so that the heat in the cavity is transferred to the outside.
Specifically, the housing 1 comprises a body and a cover 13, the body and the cover 13 cooperate to form the cavity, and the cover 13 is in threaded connection with the body; one end of the shaft 32 passes through the body, and the other end of the shaft 32 passes through the cover 13. Thus, the cover 13 can be detached by rotating the cover 13, and the maintenance of the motor by workers is facilitated.
Specifically, slide rails corresponding to the first fixing blocks 212 one to one are further arranged in the body; the first fixing block 212 is inserted into the slide rail and is slidably connected to the slide rail. The first fixing block 212 is inserted into the slide rail, so that the stator structure 2 is prevented from rotating around the axis of the shaft center 32; dismantle the back with lid 13, take stator structure 2 out from this internal, can accomplish the process of dismantling stator structure 2 to the stator of having solved traditional brushless motor passes through threaded connection and installs in casing 1, the problem of the installation of being not convenient for.
In one embodiment, as shown in fig. 8, a second bearing 15 is embedded in the body of the housing; a first bearing 14 is embedded in the cover 13; one end of the shaft center 32 is inserted into the inner ring of the second bearing 15 and connected with the inner ring of the second bearing 15, and the other end of the shaft center 32 is inserted into the inner ring of the first bearing 14 and connected with the inner ring of the first bearing 14.
The invention also discloses a manufacturing method of the coil of the brushless motor, which comprises the following steps: winding a coil 34 along the outer surfaces of the first frame 21, the iron core 22 and the second frame 23; so that the wound coil 34 passes through the first and second slots and the coil 34 is pressurized to form a wound body; a primary covering step of forming a primary covering layer so as to cover the wound body; and a secondary covering step of forming a secondary covering layer so as to cover the primary covering layer. In this manner, by pressurizing the coils 34, the coils 34 are made more compact, facilitating the primary coating on the wound body; by providing the winding body, the primary coating layer and the secondary coating layer, the brushless motor has a stronger inductance and improves the operation efficiency of the motor, compared with a conventional single-layer coil motor.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (5)
1. A brushless motor, comprising:
the shell is internally provided with a cavity;
the stator structure is inserted into the shell and arranged in the cavity; and
the rotor structure is arranged in the stator structure and comprises a permanent magnet, an axle center, fan blades and a heat dissipation assembly, one end of the axle center penetrates through one side face of the permanent magnet and one side face of the shell, the other end of the axle center penetrates through the other side face of the shell, the axle center is rotatably connected with the shell, the heat dissipation assembly and the fan blades are both arranged on the axle center and are both arranged in the cavity, the heat dissipation assembly is abutted against the stator structure, and the axle center is used for driving the fan blades to rotate;
the stator structure comprises a first framework, an iron core, a coil and a second framework; the iron core is inserted into the first framework, and the second framework is inserted into the iron core; the first framework comprises a first sleeve and a plurality of first fixing blocks; the first fixed blocks are arranged on the outer peripheral side of the first sleeve at intervals around the central axis of the first sleeve; the iron core is inserted into the first sleeve; the first sleeve is matched with the first fixing blocks to form a plurality of first grooves; the second framework comprises a second sleeve and a plurality of second fixing blocks; the second fixed blocks are arranged on the inner surface of the second sleeve at intervals around the central axis of the second sleeve; the second sleeve is inserted into the iron core; the second sleeve is matched with the second fixing blocks to form a plurality of second grooves, and the first grooves and the second grooves are arranged oppositely; the coil sequentially passes through the first groove and the second groove and is sleeved on the outer surfaces of the first framework, the iron core and the second framework;
the heat dissipation assembly comprises a connecting block, a partition plate and a third sleeve made of iron; a guide block with an L-shaped outer contour is arranged in the third sleeve; the guide block is connected with the inner surface of the third sleeve; the third sleeve is arranged on one side face of the stator structure, the connecting block is inserted into the third sleeve, the partition plate is inserted into the connecting block, and the axis sequentially penetrates through the third sleeve, the connecting block, the partition plate and the fan blade;
the outer contour of the connecting block is arranged in a tubular shape, and the inner surface of the connecting block is provided with a guide block for the guide block to pass through; the inner surface of the connecting block is also provided with a cushion block; the partition plate is inserted into the connecting block and abutted against the cushion block; the baffle plate is provided with a notch for the guide block to pass through; the baffle plate is further provided with a protruding block, the axis of the protruding block penetrates through the axis of the baffle plate, and the protruding block is abutted to the fan blades.
2. The brushless motor of claim 1, wherein a plurality of U-shaped channels are embedded in the side wall of the housing, the U-shaped channels being sequentially connected to each other, and the U-shaped channels are used for the circulation of cooling fluid; a liquid inlet and a liquid outlet are arranged on the outer surface of the side wall of the shell; the liquid inlet and the liquid outlet are communicated with the U-shaped channel.
3. The brushless electric machine of claim 2, further comprising a water pump disposed outside the housing, an output end of the water pump being in communication with the liquid inlet, an input end of the water pump being in communication with the liquid outlet, the water pump being configured to drive the coolant to circulate within the U-shaped channel.
4. The brushless electric machine of claim 1, wherein the housing has vents on both sides that are rotatably connected to the shaft, the vents communicating with the cavity.
5. A method of manufacturing a coil of a brushless motor according to any one of claims 1 to 4, comprising the steps of:
s1, winding a coil along the outer surfaces of the first framework, the iron core and the second framework;
s2, enabling the wound coil to pass through a first groove and a second groove, and pressurizing the coil to form a wound body;
s3, a primary covering procedure, namely forming a primary covering layer in a mode of covering the winding body;
and S4, a secondary covering procedure, namely forming a secondary covering layer in a mode of covering the primary covering layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210533855.5A CN114640218B (en) | 2022-05-17 | 2022-05-17 | Brushless motor and manufacturing method of coil thereof |
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| CN202210533855.5A CN114640218B (en) | 2022-05-17 | 2022-05-17 | Brushless motor and manufacturing method of coil thereof |
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| CN114640218A CN114640218A (en) | 2022-06-17 |
| CN114640218B true CN114640218B (en) | 2022-08-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101150990B1 (en) * | 2010-06-19 | 2012-06-13 | 김유정 | Brushless dc motor with slotless stator core |
| CN103986251B (en) * | 2014-06-04 | 2017-02-22 | 江苏利得尔电机有限公司 | High-power density motor with water cooling structure |
| CN206272458U (en) * | 2016-11-22 | 2017-06-20 | 宁波市君纬电气有限公司 | A kind of energy-conservation self-starting synchronous motor |
| JP2019170066A (en) * | 2018-03-23 | 2019-10-03 | 日本電産トーソク株式会社 | motor |
| CN108347148B (en) * | 2018-05-03 | 2024-02-02 | 包头天工电机有限公司 | Permanent-magnet slotless DC motor armature and its processing technology |
| CN209375320U (en) * | 2019-01-26 | 2019-09-10 | 无锡市迅驰焊接设备制造有限公司 | A kind of servo motor water cooling plant |
| CN112366845A (en) * | 2020-12-17 | 2021-02-12 | 哈尔滨理工大学 | High-efficiency back-wound winding tooth-groove-free permanent magnet synchronous motor |
| CN112821675B (en) * | 2020-12-30 | 2024-02-06 | 苏州大原电器有限公司 | Compact DC motor |
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