Motor commutation device and motor assembly

Abstract

This invention discloses a commutation device and a motor assembly for an electric motor, relating to the field of electric motor technology. The commutation device includes a commutator and a brush assembly for an electric motor comprising a stator and a rotor. The commutator is coaxially connected to the rotor and includes a plurality of concentrically insulated commutation rings. Each commutation ring includes a commutation ring body and commutation segments arranged alternately and at equal intervals around the circumference of the commutation ring body. The brush assembly includes a plurality of power brushes positioned opposite the commutation segments and two commutation ring brushes opposite the commutation ring body. The power brushes abut against the commutation segments and are electrically connected to the positive and negative terminals of an external power source. The commutation ring brushes abut against the commutation ring body and are electrically connected to the stator coils. When the commutator rotates, different commutation segments alternately and cyclically abut against the power brushes, and the power brushes and commutation ring brushes achieve electrical conduction through the commutation rings. This invention solves the problems of high cost and high failure rate in existing electric motors.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to an electric motor commutation device and an electric motor assembly. Background Technology

[0002] With the improvement of people's living standards and the development of modern production and office automation, household appliances, industrial robots and other equipment are becoming more and more efficient, miniaturized and intelligent. As an important component of actuators, motors are also experiencing rapid growth in applications.

[0003] Currently, most three-phase DC motors used in the market are brushless motors. Electronically commutated three-phase DC motors mainly include: stator, rotor, PCBA, etc. The working principle of brushless motors is to complete commutation through program control, that is, current commutation can be completed without carbon brushes. Because program control is required, including filtering, rectification, high-frequency commutation, etc., the cost of PCBA is high, and due to the large number of electronic components, the failure rate is high when used in harsh environments for a long time. Summary of the Invention

[0004] The main objective of this invention is to provide a motor commutation device and a motor assembly, which aims to solve the problems of high cost and failure rate of existing motors.

[0005] To achieve the above objectives, the present invention provides a motor commutation device for a motor including a stator and a rotor, comprising:

[0006] A commutator, coaxially connected to the rotor, includes a plurality of commutator rings arranged concentrically, the plurality of commutator rings being insulated from each other; each commutator ring includes a commutator ring body and commutator segments connected to the commutator ring body, the commutator segments of the plurality of commutator rings being alternately and equally spaced in the circumferential direction; and

[0007] The brush assembly includes a plurality of power brushes disposed relative to the commutator segments and two commutator ring brushes relative to the commutator ring body; the power brushes abut against the commutator segments of the commutator ring and can be electrically connected to the positive and negative terminals of an external power supply; the commutator ring brushes abut against the commutator ring body and are electrically connected to the coils of the stator.

[0008] When the commutator rotates, different commutator segments alternately and cyclically contact the power brushes, and the power brushes and commutator ring brushes are electrically connected through the commutator ring.

[0009] In one embodiment, the commutator bodies of a plurality of commutator rings are disposed on the same plane, and the commutator segments are located outside the commutator ring bodies and extend toward the axial direction of the commutator ring bodies.

[0010] In one embodiment, the number of commutator rings is three, and each commutator ring includes four commutator segments equally spaced on the outside of the commutator ring body.

[0011] In one embodiment, the commutator further includes an insulating frame, the commutator ring body is connected to the end face of the insulating frame, the commutator segment is connected to the outer peripheral surface of the insulating frame, and the commutator ring and the insulating frame are integrally formed.

[0012] In one embodiment, the insulating frame includes a first connecting portion and a second connecting portion that are interconnected, the commutator ring is connected to the first connecting portion, and the second connecting portion is arranged in a hollow column shape for fitting around the outer periphery of the motor rotor.

[0013] In one embodiment, the end face of the first connecting portion facing away from the second connecting portion is provided with circumferentially spaced interval holes, the interval holes being located between two adjacent commutator ring bodies, and the outer peripheral surface of the first connecting portion is provided with interval grooves, the interval grooves being located between two adjacent commutator segments.

[0014] In one embodiment, the commutation ring brush includes two copper alloy springs and a graphite sheet. One end of the two copper alloy springs is connected, and the other end is set at an angle. The graphite sheet is connected to the two copper alloy springs and extends out of the angle. The power brush includes a mounting frame and a brush head connected to the mounting frame. An elastic element is connected between the end of the brush head away from the commutation ring and the mounting frame.

[0015] In one embodiment, the commutator ring is made of copper alloy, and the surface roughness of the commutator ring is no greater than 3.2 μm.

[0016] The present invention also proposes an electric motor device, comprising:

[0017] case;

[0018] A stator is disposed within the housing. The stator includes a stator core, a coil, and a bearing. The coil is wound around the stator core, and the bearing is coaxially arranged with the stator core.

[0019] A rotor includes a rotor shaft and a permanent magnet sleeved on the rotor shaft. The rotor shaft is rotatably connected to the bearing, and the coil is sleeved on the permanent magnet. The rotor is rotatable relative to the stator.

[0020] As described above, in the motor commutation device, the commutator is connected to the end of the rotor away from the bearing, and the brush assembly is connected to the housing.

[0021] In one embodiment, the motor device further includes a motor PCBA, the commutation ring brush is electrically connected to the motor PCBA, and the motor PCBA is electrically connected to the coil.

[0022] The technical solution of this invention involves setting a commutator coaxially connected to the rotor of a motor. The commutator includes several commutator rings arranged concentrically, with insulation between them. Each commutator ring includes a commutator ring body and commutator segments connected to the commutator ring body. The commutator segments of the several commutator rings are arranged alternately and at equal intervals in the circumferential direction. The invention also includes a brush assembly, which includes several power brushes arranged opposite the commutator segments and two commutator ring brushes opposite the commutator ring body. The power brushes abut against the commutator segments of the commutator ring and can be electrically connected to the positive and negative terminals of an external power supply. The commutator ring brushes abut against the commutator ring body and are electrically connected to the stator coils. When the commutator rotates, different commutator segments alternately and cyclically abut against the power brushes, and the power brushes and commutator ring brushes achieve electrical conduction through the commutator rings. As the commutator rotates, the commutator segments that contact the power brushes also change direction, ultimately changing the direction of the current in the stator coils. This causes the direction of the magnetic field formed by the stator to change as well. Through the commutator and brush assembly, mechanical commutation of the stator current is achieved, avoiding the use of PCBA and its complex control circuits. This saves costs and makes the motor commutation device suitable for various complex and harsh working conditions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the electric motor device of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the structure when the rotor and commutator are connected;

[0026] Figure 3 for Figure 2 An explosion diagram;

[0027] Figure 4 for Figure 1 A schematic diagram of the intermediate commutator;

[0028] Figure 5 for Figure 4 A schematic diagram of the commutator from another perspective;

[0029] Figure 6 for Figure 4 Schematic diagram of the commutation ring structure;

[0030] Figure 7 for Figure 1 Exploded view of the middle stator;

[0031] Figure 8 for Figure 1 Schematic diagram of the commutation ring brush in the middle;

[0032] Figure 9 for Figure 1 A schematic diagram of the structure of the power supply brush.

[0033] Explanation of icon numbers:

[0034] 10 Electric motor 100 case 200 stator 210 stator core 220 coil 230 bearings 240 stator frame 300 Rotor 310 rotor shaft 320 permanent magnet 330 Rotor frame 400 Motor commutation device 410 commutator 411 commutation ring 4111 Commutation ring body 4112 Commutator 412 Insulating frame 4121 First connecting part 4121a Spacing hole 4121b Spacing slot 4122 Second connecting part 420 Brush assembly 421 Commutating ring brush 4211 Copper alloy shrapnel 4212 graphite sheet 422 Power brush 4221 elastic element 4222 electric brush head 4223 Mounting rack 500 Motor PCBA

[0035] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0039] Currently, most three-phase DC motors used in the market are brushless motors. Electronically commutated three-phase DC motors mainly include: stator, rotor, PCBA, etc. The working principle of brushless motors is to complete commutation through program control, that is, current commutation can be completed without carbon brushes. Because program control is required, including filtering, rectification, high-frequency commutation, etc., the cost of PCBA is high, and due to the large number of electronic components, the failure rate is high when used in harsh environments for a long time.

[0040] To address the aforementioned problems, this invention proposes a motor commutation device and a motor device equipped with the motor commutation device.

[0041] Please see Figure 1 and Figure 6 The motor commutation device 400 is used for a motor including a stator 200 and a rotor 300. In this embodiment, the motor commutation device 400 includes a commutator 410 and a brush assembly 420. The commutator 410 is coaxially connected to the rotor 300. The commutator 410 includes a plurality of concentric commutator rings 411, which are insulated from each other. Each commutator ring 411 includes a commutator ring body 4111 and commutator segments 4112 connected to the commutator ring body 4111. The commutator segments 4112 of the plurality of commutator rings 411 are alternately and equally spaced in the circumferential direction. The brush assembly 420 includes a plurality of power brushes 422 disposed opposite to the commutator segments 4112, and two brushes opposite to the commutator segments 4112. The commutator ring body 4111 has a commutator ring brush 421; the power brush 422 abuts against the commutator segment 4112 of the commutator ring 411 and can be electrically connected to the positive and negative terminals of an external power supply; the commutator ring brush 421 abuts against the commutator ring body 4111 and is electrically connected to the coil 220 of the stator 200; when the commutator ring 411 rotates, different commutator segments 4112 alternately and cyclically abut against the power brush 422, and the power brush 422 and the commutator ring brush 421 are electrically connected through the commutator ring 411.

[0042] When the power brush 422 is electrically connected to the positive and negative terminals of the external power supply, the current flows through the power brush 422 to the commutator ring 411, then from the commutator ring 411 to the commutator ring brush 421, and finally flows into the coil 220 of the stator 200, generating a magnetic field. When the rotor 300 also forms a magnetic field, and the magnetic field formed by the stator 200 and the magnetic field formed by the rotor 300 are in opposite directions, the rotor 300 begins to rotate under the action of the magnetic field. Since the commutator 410 is coaxially connected to the rotor 300, the commutator 410 also rotates synchronously under the drive of the rotor 300. As the commutator 410 rotates, the commutator segment 4112 that abuts against the power brush 422 also changes accordingly. Ultimately, the direction of the current in the coil 220 also changes, causing the direction of the magnetic field formed by the stator 200 to also change, thus ensuring that the directions of the magnetic field formed by the stator 200 and the magnetic field formed by the rotor 300 always remain opposite. When the commutator 410 rotates, the rotor 300 can be continuously rotated by the different commutator segments 4112 alternatingly contacting the power brushes 422.

[0043] Based on a DC power supply, the motor commutation device 400 achieves mechanical commutation of the stator current 200 through the commutator 410 and brush assembly 420, avoiding the use of PCBA and its complex control circuits. While saving costs, it also makes the motor commutation device 400 applicable to various complex and harsh working conditions.

[0044] Specifically, to achieve alternating and cyclic contact between different commutator segments 4112 and the power brushes 422, the commutator segments 4112 of different commutator rings 411 are arranged at the same height on the same circumference, ensuring consistency when the power brushes 422 contact different commutator segments 4112. The commutator segments 4112 are connected to the commutator ring body 4111, and can be arranged at the same height as the commutator ring body 4111, extending radially towards the commutator ring body 4111. That is, the contact surfaces of the power brushes 422 and commutator segments 4112, and the contact surfaces of the commutator ring brushes 421 and commutator ring body 4111, are located on the same plane. When the commutator segment 4112 is located on the outside of the commutator ring body 4111, the commutator segment 4112 increases the maximum outer diameter of the commutator 410. When the commutator segment 4112 is located on the inside of the commutator ring body 4111, the diameter of the commutator ring body 4111 needs to meet certain requirements in order to arrange the commutator segment 4112, that is, the maximum outer diameter of the commutator 410 needs to meet certain requirements.

[0045] Please see Figure 6Preferably, in one embodiment, the commutator ring bodies 4111 of the plurality of commutator rings 411 are arranged on the same plane, and the commutator segments 4112 are located outside the commutator ring bodies 4111 and extend toward the axis of the commutator ring bodies 4111. Specifically, when the commutator ring bodies 4111 are arranged horizontally, the commutator segments 4112 can extend upward or downward. The contact surfaces of the power brushes 422 and the commutator segments 4112 and the contact surfaces of the commutator ring brushes 421 and the commutator ring bodies 4111 are not on the same plane. With the outer diameter of the commutator ring bodies 4111 remaining unchanged, the commutator segments 4112 can be adequately arranged without excessively increasing the maximum outer diameter of the commutator 410. Furthermore, when the commutator 410 is connected to the upper end of the rotor 300, the commutator segment 4112 extends downward along the axial direction of the commutator ring body 4111, thereby reducing the overall volume occupied by the commutator 410 and the rotor 300.

[0046] Please continue reading. Figure 6 In one embodiment, the number of commutator rings 411 is three, and each commutator ring 411 includes four commutator segments 4112 equally spaced outside the commutator ring body 4111. In this case, the motor commutation device 400 can convert two-phase DC to three-phase DC, realizing the cyclical change of current direction within the coil 220. When the rotor speed 300 and the spacing of the commutator segments 4112 remain constant, the number of commutator segments 4112 affects the frequency of current commutation. The more commutator segments 4112 in the same commutator ring 411, the smaller the angle range required for setting commutator segments 4112 in three different commutator rings 411, and the more times the current commutates during one revolution of the rotor 300. Since the commutator 410 and the rotor 300 rotate synchronously, the frequency of current commutation needs to be adapted to the rotation speed of the rotor 300. If the current direction is changed before the rotor 300 has rotated to the corresponding angle, it will not be able to drive the rotor 300 to rotate. Preferably, each of the commutator rings 411 is configured to include four commutator segments 4112 that are equally spaced on the outside of the commutator ring body 4111, so that the frequency of current commutation has a better matching effect with the rotation speed of the rotor 300.

[0047] To achieve the effect of current commutation, the different commutator rings 411 need to be insulated from each other. Specifically, the commutator rings 411 can be integrally formed and insulated from each other by setting an insulating layer between them. Alternatively, the commutator rings 411 can be set separately and insulated from each other by setting them at intervals.

[0048] Please see Figure 4 and Figure 5 In one embodiment, the commutator 410 further includes an insulating frame 412. The commutator ring body 4111 is connected to the end face of the insulating frame 412, and the commutator segment 4112 is connected to the outer peripheral surface of the insulating frame 412. The commutator ring 411 and the insulating frame 412 are integrally formed. The insulating frame 412 achieves insulation between different commutator rings 411 and also provides a fixed support for the commutator ring 411, facilitating the installation and connection of the commutator ring 411 with other components. Preferably, the commutator ring 411 and the insulating frame 412 are integrally formed, and the insulating frame 412 is formed by injection molding and overmolding the commutator ring 411, avoiding the installation steps between the commutator ring 411 and the insulating frame 412, thus saving installation time.

[0049] Furthermore, to facilitate the installation and connection between the commutator 410 and the rotor 300, the insulating frame 412 is configured to include a first connecting part 4121 and a second connecting part 4122 that are interconnected. The commutator ring 411 is connected to the first connecting part 4121, and the second connecting part 4122 is a hollow columnar configuration for fitting around the outer periphery of the motor rotor 300. When the commutator 410 is connected to the rotor 300, the commutator 410 can be directly fitted onto the rotor 300 through the second connecting part 4122. It can also be disassembled for replacement or maintenance, thus achieving flexible installation of the commutator 410 and the rotor 300.

[0050] Specifically, the material used for injection molding the commutator ring 411 is thermosetting plastic, that is, the material of the insulating skeleton 412 is thermosetting plastic. Thermosetting plastic has excellent insulation, corrosion resistance and water resistance, and low material cost, which can further reduce the production cost required for the motor commutation device 400.

[0051] In one embodiment, the first connecting portion 4121 has circumferentially spaced interval holes 4121a on its end face facing away from the second connecting portion 4122. The interval holes 4121a are located between two adjacent commutator ring bodies 4111. The outer circumferential surface of the first connecting portion 4121 has interval grooves 4121b spaced between two adjacent commutator segments 4112. During injection molding of the commutator ring 411, the interval holes 4121a ensure the radial spacing between adjacent commutator ring bodies 4111, and the interval grooves 4121b ensure the circumferential spacing between adjacent commutator segments 4112. This reduces the accuracy error between different commutators 410 during production and improves the consistency of the finished product.

[0052] The power brush 422 and the commutation ring brush 421 are electrically connected through the commutation ring 411. The commutation ring 411 acts as a bridge and needs to have a certain conductivity, which means that the commutation ring 411 is made of conductive material. Preferably, the commutation ring 411 is made of copper alloy. Copper alloy has good conductivity and good ductility, which makes it easy to manufacture and process into the required structural shape.

[0053] Please see Figure 8 and Figure 9 In one embodiment, the commutation ring brush 421 includes two copper alloy springs 4211 and a graphite sheet 4212. One end of the two copper alloy springs 4211 is connected, and the other end is set at an angle. The graphite sheet 4212 is connected to the two copper alloy springs 4211 and extends out of the angle. The power brush 422 includes a mounting bracket 4223 and a brush head 4222 connected to the mounting bracket 4223. An elastic element 4221 is connected between the end of the brush head 4222 away from the commutation ring 411 and the mounting bracket 4223. The lower end of the graphite sheet 4212 extending beyond the included angle abuts against the commutator ring body 4111. As the commutator 410 rotates, sliding friction occurs between the commutator ring body 4111 and the graphite sheet 4212, inevitably causing some wear on the graphite sheet 4212, resulting in a shorter length of the portion extending beyond the included angle. Similarly, as the commutator 410 rotates, sliding friction occurs between the commutator segment 4112 and the brush head 4222, also inevitably causing some wear on the brush head 4222.

[0054] To ensure that the graphite sheet 4212 always abuts against the commutator ring body 4111, two copper alloy spring sheets 4211 are connected at one end and set at an angle at the other end. The upper copper alloy spring sheet 4211 bends to a certain extent while forming an angle with the other copper alloy spring sheet 4211. The resulting elasticity causes the upper copper alloy spring sheet 4211 to have a downward tendency to press against the graphite sheet 4212, so that the graphite sheet 4212 always abuts against the commutator ring body 4111. To ensure that the brush head 4222 always abuts against the commutator segment 4112, an elastic element 4221 is connected between the end of the brush head 4222 away from the commutator ring 411 and the mounting bracket 4223. Under the action of elastic force, the elastic element 4221 tends to move the brush head 4222 towards the commutator segment 4112, so that the brush head 4222 can always abut against the commutator segment 4112. Specifically, the elastic element 4221 includes a spring, etc.

[0055] Furthermore, to reduce the wear of the power brush 422 and the commutation ring brush 421, the surface roughness of the commutation ring 411 can be reduced, that is, the frictional resistance between the power brush 422, the commutation ring brush 421, and the commutation ring 411 can be reduced. Preferably, the surface roughness of the commutation ring 411 is set to no more than 3.2 μm, which can reduce the wear of the power brush 422 and the commutation ring brush 421 and extend their service life.

[0056] Please see Figures 1 to 3 , Figure 7 The present invention also proposes an electric motor device 10, which includes a housing 100, a stator 200, a rotor 300, and a motor commutation device 400 as described above. The stator 200 is disposed within the housing 100 and includes a stator core 210, a coil 220, and a bearing 230. The coil 220 is wound around the stator core 210, and the bearing 230 is coaxially arranged with the stator core 210. The rotor 300 includes a rotor shaft 310 and a permanent magnet 320 sleeved outside the rotor shaft 310. The rotor shaft 310 is rotatably connected to the bearing 230, and the coil 220 is sleeved outside the permanent magnet 320. The rotor 300 can rotate relative to the stator 200. The commutator 410 is connected to the end of the rotor 300 away from the bearing 230, and the brush assembly 420 is connected to the housing 100. Since this electric motor device 10 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0057] Please see Figure 7 In one embodiment, the motor device 10 further includes a motor PCBA 500, the commutation ring brush 421 is electrically connected to the motor PCBA 500, and the motor PCBA 500 is electrically connected to the coil 220. In this case, the motor PCBA 500 only serves to conduct the commutation ring brush 421 and the coil 220, without changing the current flow direction. When it is necessary to change the mechanical commutation of the motor device 10 to brushless electronic commutation, a control chip can be added to the motor PCBA 500, and an external DC power supply can be directly connected to the motor PCBA 500, making the motor device 10 more versatile in its application.

[0058] Please see Figure 3 and Figure 7In one embodiment, the stator 200 further includes a stator frame 240, on which the stator core 210, coils 220, and bearings 230 are mounted. The stator frame 240 also serves to insulate adjacent coils 220, preventing short circuits caused by contact between adjacent coils 220. The rotor 300 further includes a rotor frame 330, on which the rotor shaft 310 and permanent magnet 320 are mounted. The commutator 410 is connected to the rotor frame 330. The commutator 410 and the rotor 300 can be separately molded and then connected together, or they can be integrally molded by injection molding.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A commutating device for an electric motor comprising a stator and a rotor, characterized by include: A commutator, coaxially connected to the rotor, includes a plurality of commutator rings arranged concentrically, the plurality of commutator rings being insulated from each other; each commutator ring includes a commutator ring body and commutator segments connected to the commutator ring body, the commutator segments of the plurality of commutator rings being alternately and equally spaced in the circumferential direction; and The brush assembly includes a plurality of power brushes disposed relative to the commutator segments and two commutator ring brushes relative to the commutator ring body; the power brushes abut against the commutator segments of the commutator ring and can be electrically connected to the positive and negative terminals of an external power supply; the commutator ring brushes abut against the commutator ring body and are electrically connected to the coils of the stator. When the commutator rotates, different commutator segments alternately and cyclically contact the power brushes, and the power brushes and commutator ring brushes achieve electrical conduction through the commutator ring; The commutation ring brush includes two copper alloy springs and a graphite sheet. One end of the two copper alloy springs is connected, and the other end is set at an angle. The graphite sheet is connected to the two copper alloy springs and extends out of the angle. The power brush includes a mounting frame and a brush head connected to the mounting frame. An elastic element is connected between the end of the brush head away from the commutation ring and the mounting frame. The commutation ring is made of copper alloy, and the surface roughness of the commutation ring is not greater than 3.2 μm. An insulating frame is provided, wherein the commutator ring body is connected to the end face of the insulating frame, the commutator segment is connected to the outer peripheral surface of the insulating frame, the commutator ring and the insulating frame are integrally formed, the insulating frame includes a first connecting part and a second connecting part that are connected to each other, the commutator ring is connected to the first connecting part, and the second connecting part is provided in the form of a hollow column for being sleeved on the outer periphery of the motor rotor.

2. The motor commutating device of claim 1, wherein The commutator ring bodies of several commutator rings are disposed on the same plane, and the commutator segments are located outside the commutator ring bodies and extend toward the axial direction of the commutator ring bodies.

3. The motor commutating device of claim 2, wherein The number of commutator rings is three, and each commutator ring includes four commutator segments that are equally spaced on the outside of the commutator ring body.

4. The motor commutating device of claim 3, wherein The first connecting part has circumferentially spaced interval holes on its end face away from the second connecting part. The interval holes are located between two adjacent commutator ring bodies. The outer peripheral surface of the first connecting part has interval grooves, which are located between two adjacent commutator segments.

5. An electric motor device characterized by comprising: include: case; A stator is disposed within the housing. The stator includes a stator core, a coil, and a bearing. The coil is wound around the stator core, and the bearing is coaxially arranged with the stator core. The rotor includes a rotor shaft and a permanent magnet sleeved on the rotor shaft. The rotor shaft is rotatably connected to the bearing, and the coil is sleeved on the permanent magnet. The rotor can rotate relative to the stator. as well as The electric motor commutation device according to any one of claims 1 to 4, wherein the commutator is connected to the end of the rotor away from the bearing, and the brush assembly is connected to the housing.

6. The motor device of claim 5, wherein The electric motor assembly also includes a motor PCBA, the commutation ring brush is electrically connected to the motor PCBA, and the motor PCBA is electrically connected to the coil.

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