A six-slot four-pole permanent magnet brush motor

Abstract

The utility model provides a kind of six-slot four-pole permanent magnet brush motor belongs to brush motor technical field.It solves the technical problems such as the compact structure of existing permanent magnet brush motor, limited output torque, large working current etc.The inner side wall of the shell in the six-slot four-pole permanent magnet brush motor is provided with four magnetic steels, the magnetic poles of the inner side of adjacent two magnetic steels are opposite, the rotor is rotatably installed in the shell, the rotor is fixedly connected with commutator and iron core, the commutator has six commutating sheets, six winding slots are provided on the iron core, two carbon brushes are vertically provided on the lower side of mounting plate, the carbon brush can contact and electrically connect with the commutator, and the coil winding is wound on the iron core.The utility model forms four-pole magnetic field by using four magnetic steels, and cooperates with six-slot rotor, significantly enhances the strength and uniformity of magnetic field, thereby effectively improves the electromagnetic torque output of motor, so that the output torque of motor is larger under the premise of compact structure.

Description

Technical Field

[0001] This utility model belongs to the field of brushed motor technology, specifically referring to a six-slot, four-pole permanent magnet brushed motor. Background Technology

[0002] Miniature brushed motors are widely used in household appliances, automotive parts, and small mechanical equipment due to their simple structure, low manufacturing cost, and convenient control. Their basic structure typically includes a housing, stator, rotor, carbon brush assembly, and end caps. Among these, the carbon brushes, as a key component for power transmission, directly affect the motor's commutation performance, heat dissipation efficiency, and overall lifespan through their installation method.

[0003] In existing technologies, such as the micro brushed motor structure disclosed in Chinese patent CN222192002U, the carbon brush plate is mounted upside down on the housing near the rotor fan blades, and ventilation holes are provided to enhance heat dissipation, thereby reducing the operating temperature of the carbon brush area and extending its service life. In this structure, the carbon brushes are arranged symmetrically, that is, two carbon brushes are mounted 180 degrees opposite each other on the upper side of the carbon brush plate, and the stator uses two permanent magnets to form a magnetic circuit. Although this design has certain advantages in terms of structural compactness and heat dissipation, it still has the following limitations:

[0004] 1. The 180-degree symmetrical installation of carbon brushes and the relatively fixed connection form of rotor windings limit the optimization space of winding method, resulting in the electromagnetic torque of the motor not being fully utilized during operation and the output torque being limited.

[0005] 2. Since the carbon brush is located on the upper side of the mounting plate, its contact angle and pressure distribution with the commutator are not easy to adjust, which may cause current fluctuations, increase the motor operating current, and affect energy efficiency.

[0006] 3. The magnetic field strength of the magnetic circuit formed by only two permanent magnets is limited, which further restricts the improvement of motor performance, especially in applications that require higher starting torque and stable output.

[0007] Therefore, it is necessary to optimize the carbon brush mounting method and magnetic circuit structure of existing micro brushed motors in order to further improve the output torque and reduce the operating current of the motor while ensuring a compact structure. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a six-slot four-pole permanent magnet brushed motor with a compact structure, greater output torque, and lower operating current.

[0009] The objective of this utility model can be achieved through the following technical solutions:

[0010] A six-slot, four-pole permanent magnet brushed motor includes a housing, a rotor, carbon brushes, a mounting plate, and an end cover. The housing has four magnets on its inner wall, with adjacent magnets having opposite magnetic poles. The rotor is rotatably mounted within the housing. A commutator and an iron core are fixedly connected to the rotor. The commutator has six commutator segments. The iron core has six winding slots. Two carbon brushes are vertically arranged on the lower side of the mounting plate, and these brushes can contact and be electrically connected to the commutator. A coil winding is wound around the iron core.

[0011] This permanent magnet brushed motor uses four magnets to form a quadrupole magnetic field, which, in conjunction with a six-slot rotor, significantly enhances the strength and uniformity of the magnetic field, thereby effectively improving the motor's electromagnetic torque output. This allows the motor to output greater torque while maintaining a compact structure. At the same time, the carbon brushes are mounted on the underside of the mounting plate, optimizing the contact angle and pressure distribution between the carbon brushes and the commutator, reducing current fluctuations, lowering the operating current, and improving energy efficiency. This overcomes the problems of insufficient output torque and current fluctuations caused by symmetrical carbon brush mounting and magnetic circuit limitations in existing technologies.

[0012] In the aforementioned six-slot four-pole permanent magnet brushed motor, each commutator segment has an outwardly protruding wiring hook formed at its lower end.

[0013] In this permanent magnet brushed motor, each commutator segment has an outwardly protruding terminal hook at its lower end, which makes the connection of the coil winding more convenient and reliable, simplifies the winding process, improves production efficiency, and reduces the contact resistance at the connection point, which helps to reduce energy loss and further improve the overall energy efficiency of the motor.

[0014] In the aforementioned six-slot four-pole permanent magnet brushed motor, the inner sidewall of the housing is formed with inwardly protruding limiting protrusions, and there are four limiting protrusions located between two adjacent magnets.

[0015] The permanent magnet brushed motor has four limiting protrusions on the inner wall of the housing, which can effectively fix the position of the magnet, prevent the magnet from shifting during motor operation, ensure the stability and consistency of the magnetic field distribution, thereby ensuring the reliability of motor performance and extending service life.

[0016] In the aforementioned six-slot four-pole permanent magnet brushed motor, a cylindrical protective cover is fitted on the outer side of the housing.

[0017] The permanent magnet brushed motor has a cylindrical protective cover on the outside of the housing, which provides additional mechanical protection and insulation barrier to prevent foreign objects from entering the motor. At the same time, it can help dissipate heat and reduce electromagnetic interference, thereby enhancing the motor's safety and environmental adaptability.

[0018] In the aforementioned six-slot four-pole permanent magnet brushed motor, the iron core includes a main body, teeth, and wedges. The rotor shaft passes through the main body and is fixed coaxially with it. The main body, teeth, and wedges are formed as an integral structure. There are six teeth arranged in a ring around the central axis of the main body. Each tooth is fixedly connected to a wedge at its outer end. The left and right sides of the wedge protrude from the left and right sides of the tooth. A winding groove is formed between two adjacent teeth, and there is a gap between two adjacent wedges.

[0019] The iron core of this permanent magnet brushed motor adopts an integrated structure, in which the wedge protrudes from both sides of the tooth section. This not only enhances the mechanical strength of the iron core, but also makes the winding slot structure more stable, which facilitates the tight winding of the coil winding, prevents the coil from coming off the tooth section during high-speed rotation, optimizes the magnetic circuit efficiency, reduces iron loss, and thus improves the output performance and energy efficiency of the motor.

[0020] In the aforementioned six-slot, four-pole permanent magnet brushed motor, the six commutator segments are numbered sequentially as commutator segments 1-6, and the six teeth are numbered sequentially as teeth 1-6. Teeth 1 is located below and between commutator segments 1 and 6. The coil winding is first hung on commutator segment 1, then on commutator segment 4, then wound onto tooth 2, then onto tooth 5; then first hung on commutator segment 2, then on commutator segment 5, then wound onto tooth 3, then onto tooth 6; finally, first hung on commutator segment 3, then on commutator segment 6, then wound onto tooth 1, then onto tooth 4.

[0021] This permanent magnet brushed motor optimizes the current path and magnetic field distribution through a specific winding connection method, making the electromagnetic torque more uniform and powerful, reducing torque pulsation, thereby reducing the operating current and further improving the output torque and running stability of the motor. Based on the above winding connection method, the carbon brushes can be installed at 90 degrees, which is conducive to optimizing the overall structure of this permanent magnet brushed motor.

[0022] In the aforementioned six-slot four-pole permanent magnet brushed motor, a fan is provided above the iron core, and several air outlets are provided circumferentially at intervals on the housing corresponding to the fan. Several lower air inlets are provided at the bottom of the housing, and several upper air inlets are provided on the end cover. A mounting hole is provided in the middle of the mounting plate, and the upper end of the commutator can be inserted into the lower part of the mounting hole. There is an air inlet gap between the outer peripheral surface of the commutator and the wall of the mounting hole.

[0023] This permanent magnet brushed motor is equipped with a fan, multiple air inlets and outlets, and an air inlet gap, forming a highly efficient cooling air duct. Air enters from the bottom and end cover, passes through the motor interior, and is discharged circumferentially from the housing. This effectively removes the heat generated by the carbon brushes, commutator, and coil windings, significantly reducing the motor's operating temperature, extending the life of key components, and ensuring stable output of the motor in high-temperature environments.

[0024] In the aforementioned six-slot four-pole permanent magnet brushed motor, the impeller includes an upper ring, a lower ring, and blades. The upper end of the blades is fixedly connected to the upper ring, and the lower end is fixedly connected to the lower ring. Multiple blades are arranged at intervals along the circumference of the upper ring. A downwardly extending positioning protrusion is fixed on the lower side of the lower ring. The positioning protrusion can be inserted into the gap between two wedges.

[0025] In this permanent magnet brushed motor, the impeller achieves precise positioning and stable rotation through the gap fit between the positioning protrusion and the wedge of the iron core, improving impeller efficiency and heat dissipation uniformity. At the same time, the integrated design of the fan blades and the upper and lower rings fixedly connected reduces vibration and noise, enhancing the overall reliability of the motor and the user experience.

[0026] In the aforementioned six-slot, four-pole permanent magnet brushed motor, the mounting plate is provided with two terminals, which are positioned at 90 degrees. Each terminal is electrically connected to an adjacent carbon brush via a connecting wire. The terminals and carbon brushes are fixedly connected to the lower side of the mounting plate. Each terminal includes an upper terminal and a lower terminal. Each carbon brush includes a brush body and a brush frame. The upper terminal passes upward through the mounting plate and the end cap. The lower terminal is electrically connected to one end of the connecting wire, and the other end of the connecting wire is electrically connected to the brush body of the carbon brush. The brush frame is fixedly connected to the lower side of the mounting plate. The brush body can reciprocate relative to the brush frame along the radial direction of the mounting plate. A torsion spring is provided on the mounting plate to drive the brush body to move inward.

[0027] In this permanent magnet brushed motor, the terminals are set at 90 degrees, which optimizes the spatial layout and makes the structure more compact. The carbon brushes are driven by torsion springs to maintain a constant pressure with the commutator, ensuring stable electrical contact, reducing arcing and current fluctuations, thereby further reducing the operating current, improving motor energy efficiency and carbon brush life, and facilitating external wiring and maintenance.

[0028] Compared with the prior art, the technical effects of this utility model are as follows:

[0029] This invention uses four magnets to form a quadrupole magnetic field, which, in conjunction with a six-slot rotor, significantly enhances the strength and uniformity of the magnetic field, thereby effectively improving the electromagnetic torque output of the motor and enabling the motor to output greater torque while maintaining a compact structure.

[0030] In this invention, the carbon brush is installed on the lower side of the mounting plate, which optimizes the contact angle and pressure distribution between the carbon brush and the commutator, reduces current fluctuations, lowers the operating current, and improves energy efficiency. It overcomes the problems of insufficient output torque and current fluctuations caused by the symmetrical installation of carbon brushes and magnetic circuit limitations in the prior art. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0032] Figure 2 This is an overall sectional view of the present invention.

[0033] Figure 3 This is an exploded structural diagram of the present invention.

[0034] Figure 4 This is a schematic diagram of the rotor structure of this utility model.

[0035] Figure 5 This is a schematic diagram of the lower side of the mounting plate of this utility model.

[0036] Figure 6 This is a schematic diagram of the iron core and wind turbine of this utility model.

[0037] Figure 7 This is a schematic diagram of the winding structure of this utility model.

[0038] In the diagram, 1. Housing; 11. Magnet; 12. Limiting protrusion; 13. Air outlet; 14. Lower air inlet; 2. Rotor; 20. Shaft; 21. Iron core; 211. Main body; 212. Tooth; 213. Wedge; 214. Winding groove; 22. Commutator; 221. Commutator segment; 222. Terminal hook; 3. Mounting plate; 30. Mounting hole; 31. Carbon brush; 311. Brush body; 312. Brush frame; 32. Terminal; 321. Upper wiring section; 322. Lower wiring section; 33. Connecting wire; 4. End cover; 41. Upper air inlet; 5. Impeller; 51. Upper ring; 52. Lower ring; 53. Fan blade; 54. Positioning protrusion; 6. Protective cover. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0040] This six-slot four-pole permanent magnet brushed motor includes a housing 1, a rotor 2, carbon brushes 31, a mounting plate 3, and an end cover 4. Four magnets 11 are arranged on the inner side wall of the housing 1, with the magnetic poles of adjacent magnets 11 being opposite. The rotor 2 is rotatably mounted inside the housing 1. A commutator 22 and an iron core 21 are fixedly connected to the rotor 2. The commutator 22 has six commutator segments 221. The iron core 21 is provided with six winding slots 214. Two carbon brushes 31 are vertically arranged on the lower side of the mounting plate 3. The carbon brushes 31 can contact and be electrically connected to the commutator 22. A coil winding is wound on the iron core 21. This permanent magnet brushed motor uses four magnets 11 to form a quadrupole magnetic field, which, in conjunction with a six-slot rotor 2, significantly enhances the strength and uniformity of the magnetic field, thereby effectively improving the electromagnetic torque output of the motor. This allows the motor to output greater torque while maintaining a compact structure. At the same time, the carbon brushes 31 are mounted on the lower side of the mounting plate 3, optimizing the contact angle and pressure distribution between the carbon brushes 31 and the commutator 22, reducing current fluctuations, lowering the operating current, and improving energy efficiency. This overcomes the problems of insufficient output torque and current fluctuations caused by the symmetrical mounting of the carbon brushes 31 and magnetic circuit limitations in existing technologies.

[0041] like Figure 4 As shown, each commutator segment 221 has an outwardly protruding hook 222 formed at its lower end. The outwardly protruding hook 222 at the lower end of each commutator segment 221 in this permanent magnet brushed motor makes the connection of the coil windings more convenient and reliable, simplifies the winding process, improves production efficiency, and reduces contact resistance at the connection points, thus helping to reduce energy loss and further improve the overall energy efficiency of the motor.

[0042] like Figure 2 As shown, four inwardly protruding limiting protrusions 12 are formed on the inner sidewall of the housing 1, and are located between two adjacent magnets 11. The four limiting protrusions 12 on the inner sidewall of the housing 1 in this permanent magnet brushed motor effectively fix the position of the magnets 11, preventing them from shifting during motor operation, ensuring the stability and consistency of the magnetic field distribution, thereby guaranteeing the reliability of the motor performance and extending its service life.

[0043] Furthermore, a cylindrical protective cover 6 is fitted onto the outer side of the housing 1. The cylindrical protective cover 6 fitted onto the outer side of the housing 1 in this permanent magnet brushed motor provides additional mechanical protection and insulation barrier, preventing external foreign objects from entering the motor, while also assisting in heat dissipation and reducing electromagnetic interference, thereby enhancing the motor's safety and environmental adaptability.

[0044] like Figure 1-4As shown, the iron core 21 includes a main body 211, teeth 212 and wedges 213. The rotor shaft 20 of the rotor 2 passes through the main body 211 and is fixed coaxially with the main body 211. The main body 211, teeth 212 and wedges 213 are formed into an integral structure. There are six teeth 212 arranged in a ring around the central axis of the main body 211. Each tooth 212 is fixedly connected to a wedge 213 at its outer end. The left and right sides of the wedge 213 protrude from the left and right sides of the tooth 212. A winding groove 214 is formed between two adjacent teeth 212 and there is a gap between two adjacent wedges 213. In this permanent magnet brushed motor, the iron core 21 adopts an integrated structure, in which the wedge 213 protrudes from both sides of the tooth 212, which not only enhances the mechanical strength of the iron core 21, but also makes the structure of the winding groove 214 more stable, facilitates the tight winding of the coil winding, prevents the coil from coming off the tooth 212 during high-speed rotation, optimizes the magnetic circuit efficiency, reduces iron loss, and thus improves the output performance and energy efficiency of the motor.

[0045] like Figure 7 As shown, the six commutator segments 221 are numbered sequentially as commutator segments 1-6, and the six teeth 212 are numbered sequentially as teeth 1-6. Among them, tooth 1 is located below and between commutator segment 1 and commutator segment 6. The coil winding is first hung on commutator segment 1, then on commutator segment 4, then wound to tooth 2, then wound to tooth 5; then first hung on commutator segment 221, then on commutator segment 5, then wound to tooth 3, then wound to tooth 6; finally, first hung on commutator segment 3, then on commutator segment 6, then wound to tooth 1, then wound to tooth 4. This permanent magnet brushed motor optimizes the current path and magnetic field distribution through a specific winding connection method, making the electromagnetic torque more uniform and powerful, reducing torque pulsation, thereby reducing the operating current and further improving the output torque and running stability of the motor. Based on the above winding connection method, the carbon brush 31 can be installed at 90 degrees, which is conducive to optimizing the overall structure of this permanent magnet brushed motor.

[0046] like Figure 1-3 and Figure 6As shown, a windmill 5 is provided above the iron core 21. Several air outlet holes 13 are provided circumferentially at positions corresponding to the windmill 5 on the housing 1. Several lower air inlet holes 14 are provided at the bottom of the housing 1. Several upper air inlet holes 41 are provided on the end cover 4. A mounting hole 30 is provided in the middle of the mounting plate 3. The upper end of the commutator 22 can be inserted into the lower part of the mounting hole 30. There is an air inlet gap between the outer circumferential surface of the commutator 22 and the hole wall of the mounting hole 30. The windmill 5 includes an upper ring 51, a lower ring 52 and a fan blade 53. The upper end of the fan blade 53 is fixedly connected to the upper ring 51 and the lower end is fixedly connected to the lower ring 52. There are multiple fan blades 53 and they are arranged circumferentially at intervals along the upper ring 51. A downwardly extending positioning protrusion 54 is fixed on the lower side of the lower ring 52. The positioning protrusion 54 can be inserted into the gap between the two wedges 213.

[0047] This permanent magnet brushed motor features a fan wheel 5, multiple air inlets and outlets 13, and an air inlet gap, forming a highly efficient cooling airflow. Air enters from the bottom and end cover 4, passes through the motor interior, and exits circumferentially from the housing 1, effectively carrying away the heat generated by the carbon brushes 31, commutator 22, and coil windings. This significantly reduces the motor's operating temperature, extends the lifespan of key components, and ensures stable output under high-temperature conditions. The fan wheel 5 in this permanent magnet brushed motor achieves precise positioning and stable rotation through a clearance fit between the positioning protrusion 54 and the wedge 213 of the iron core 21, improving the efficiency and heat dissipation uniformity of the fan wheel 5. Simultaneously, the integrated design of the fan blades 53 and the upper and lower rings 52, which are fixedly connected, reduces vibration and noise, enhancing the overall reliability of the motor and the user experience.

[0048] like Figure 5 As shown, the mounting plate 3 is provided with two terminals 32, which are set at 90 degrees. Each terminal 32 is electrically connected to the adjacent carbon brush 31 through a connecting wire 33. The terminals 32 and the carbon brush 31 are fixedly connected to the lower side of the mounting plate 3. The terminals 32 include an upper terminal 321 and a lower terminal 322. The carbon brush 31 includes a brush body 311 and a brush frame 312. The upper terminal 321 passes upward through the mounting plate 3 and the end cap 4. The lower terminal 322 is electrically connected to one end of the connecting wire 33. The other end of the connecting wire 33 is electrically connected to the brush body 311 of the carbon brush 31. The brush frame 312 is fixedly connected to the lower side of the mounting plate 3. The brush body 311 can reciprocate relative to the brush frame 312 along the radial direction of the mounting plate 3. The mounting plate 3 is provided with a torsion spring that drives the brush body 311 to move inward. In this permanent magnet brushed motor, the terminal block 32 is set at a 90-degree angle, which optimizes the spatial layout and makes the structure more compact. The carbon brush 31 maintains a constant pressure with the commutator 22 through the torsion spring drive, which ensures stable electrical contact, reduces electric arc and current fluctuation, thereby further reducing the operating current, improving the motor energy efficiency and the service life of the carbon brush 31, while also facilitating external wiring and maintenance.

[0049] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A six-slot, four-pole permanent magnet brushed motor, comprising a housing (1), a rotor (2), carbon brushes (31), a mounting plate (3), and an end cover (4), characterized in that: The inner wall of the housing (1) is provided with four magnets (11), and the magnetic poles of two adjacent magnets (11) are opposite. The rotor (2) is rotatably installed in the housing (1). The rotor (2) is fixedly connected with a commutator (22) and an iron core (21). The commutator (22) has six commutator segments (221). The iron core (21) is provided with six winding slots (214). The lower side of the mounting plate (3) is vertically provided with two carbon brushes (31). The carbon brushes (31) can contact and be electrically connected to the commutator (22). The iron core (21) is wound with coil windings.

2. A six-slot, four-pole permanent magnet brushed motor according to claim 1, characterized in that: Each commutator segment (221) has an outwardly protruding wiring hook (222) formed at its lower end.

3. A six-slot, four-pole permanent magnet brushed motor according to claim 1, characterized in that: The inner wall of the housing (1) is formed with inwardly protruding limiting protrusions (12), and there are four limiting protrusions (12) located between two adjacent magnets (11).

4. A six-slot, four-pole permanent magnet brushed motor according to claim 1, characterized in that: The outer side of the housing (1) is fitted with a cylindrical protective cover (6).

5. A six-slot, four-pole permanent magnet brushed motor according to any one of claims 1-4, characterized in that: The iron core (21) includes a main body (211), teeth (212) and wedges (213). The rotor (2) shaft (20) passes through the main body (211) and is fixed coaxially with the main body (211). The main body (211), teeth (212) and wedges (213) are formed as an integral structure. There are six teeth (212) arranged in a ring around the central axis of the main body (211). Each tooth (212) is fixedly connected to a wedge (213) at its outer end. The left and right sides of the wedge (213) protrude from the left and right sides of the tooth (212). A winding groove (214) is formed between two adjacent teeth (212), and there is a gap between two adjacent wedges (213).

6. A six-slot, four-pole permanent magnet brushed motor according to claim 5, characterized in that: The six commutator segments (221) are numbered sequentially as commutator segments 1-6, and the six teeth (212) are numbered sequentially as teeth (212). Teeth (212) 1 is located below and between commutator segments 1 and 6. The coil winding is first hung on commutator segment 1 (221), then on commutator segment 4 (221), and then wound onto teeth (212). 2) Wind the wire, then wind it to the 5th gear (212); then first hang it on the 2nd commutator segment (221), then hang it on the 5th commutator segment (221), then wind it to the 3rd gear (212), then wind it to the 6th gear (212); finally first hang it on the 3rd commutator segment (221), then hang it on the 6th commutator segment (221), then wind it to the 1st gear (212), then wind it to the 4th gear (212).

7. A six-slot, four-pole permanent magnet brushed motor according to claim 5, characterized in that: A fan wheel (5) is provided above the iron core (21). Several air outlet holes (13) are provided circumferentially at positions corresponding to the fan wheel (5) on the housing (1). Several lower air inlets (14) are provided at the bottom of the housing (1). Several upper air inlets (41) are provided on the end cover (4). An installation hole (30) is provided in the middle of the mounting plate (3). The upper end of the commutator (22) can be inserted into the lower part of the installation hole (30). There is an air inlet gap between the outer peripheral surface of the commutator (22) and the hole wall of the installation hole (30).

8. A six-slot, four-pole permanent magnet brushed motor according to claim 7, characterized in that: The wind turbine (5) includes an upper ring (51), a lower ring (52) and a blade (53). The upper end of the blade (53) is fixedly connected to the upper ring (51) and the lower end is fixedly connected to the lower ring (52). The blade (53) consists of multiple blades and is spaced apart circumferentially along the upper ring (51). The lower side of the lower ring (52) is fixed with a downwardly extending positioning protrusion (54). The positioning protrusion (54) can be inserted into the gap between two wedges (213).

9. A six-slot, four-pole permanent magnet brushed motor according to claim 5, characterized in that: The mounting plate (3) is provided with two terminals (32), which are set at 90 degrees. Each terminal (32) is electrically connected to an adjacent carbon brush (31) via a connecting wire (33). The terminals (32) and carbon brushes (31) are fixedly connected to the lower side of the mounting plate (3). The terminals (32) include an upper wiring portion (321) and a lower wiring portion (322). The carbon brush (31) includes a brush body (311) and a brush frame (312). The wire portion (321) passes upward through the mounting plate (3) and the end cap (4). The lower wire portion (322) is electrically connected to one end of the connecting wire (33). The other end of the connecting wire (33) is electrically connected to the brush body (311) of the carbon brush (31). The brush frame (312) is fixedly connected to the lower side of the mounting plate (3). The brush body (311) can reciprocate relative to the brush frame (312) along the radial direction of the mounting plate (3). The mounting plate (3) is provided with a torsion spring that drives the brush body (311) to move inward.

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