Electrically conductive assembly for a motor rotor and motor

Abstract

The application discloses a motor rotor conductive assembly and a motor. The motor rotor conductive assembly comprises a support column, a conductive bearing rotatably supported between the support column and a rotating shaft of a motor rotor, a carbon brush sleeved outside the support column and in contact with the rotating shaft, and a flexible conductive belt connected with the support column and adapted to be connected with a motor shell. The motor rotor conductive assembly of the embodiment of the application enables the current of the motor rotor to be transmitted to the shell through two paths, reduces the electric corrosion of the motor bearing, increases the service life of the motor bearing, and reduces the noise problem.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a conductive component for a motor rotor and a motor having the conductive component. Background Technology

[0002] The rapid development of electric vehicles has led to increasingly higher requirements for the power density and speed of the drive motors. As the speed and power density of the motors increase, the damage caused by bearing electro-corrosion becomes more severe, resulting in bearing damage and causing order noise. In severe cases, it can lead to a rapid decline in the lifespan of the bearings, seriously affecting the functional lifespan of the motor.

[0003] Currently, the common approach to address bearing electro-corrosion is to connect external carbon brushes or make the bearing conductive to conduct the current from the rotor to the housing, thereby reducing the electro-corrosion of the bearing. However, the lifespan of the carbon brush and the application environment will cause the conductivity to decrease. In addition, after the lifespan of the conductive bearing expires, the rigid structure will also introduce NVH problems. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a conductive component for a motor rotor, enabling the current of the motor rotor to be transmitted to the housing through two paths, thereby reducing electro-corrosion of the motor bearings, increasing the service life of the motor bearings, and reducing noise.

[0005] A conductive component for a motor rotor according to an embodiment of the present invention includes: a support column; a conductive bearing rotatably supported between the support column and the shaft of the motor rotor; a carbon brush sleeved on the support column and in contact with the shaft; and a flexible conductive strip connected to the support column and adapted to be connected to a motor housing.

[0006] According to an embodiment of the present invention, the conductive component of the motor rotor has a support column disposed between a conductive bearing and a rotating shaft, with the conductive bearing, rotating shaft, and support column all in contact or connected. A carbon brush is also disposed between the conductive bearing and rotating shaft and in contact with both. One end of a flexible conductive strip is connected to the motor housing, and the other end is connected to the support column. The current in the motor rotor is transmitted through two paths: one path transmits the current through the rotating shaft to the conductive bearing, then through the conductive bearing to the support column, and finally through the support column to the flexible conductive strip, which then transmits the current to the motor housing; the other path transmits the current through the rotating shaft to the carbon brush, then through the carbon brush to the support column, and finally through the support column to the motor housing. This two-path design effectively transmits the current on the rotor, reducing or eliminating the current passing through the motor bearing. This provides better protection for the motor bearing, preventing electro-corrosion that could lead to reduced lifespan, noise, or vibration.

[0007] According to an embodiment of the present invention, in the conductive assembly of the motor rotor, the conductive bearing is sleeved outside the support column, and the inner ring of the conductive bearing is interference-fitted with the support column, and the outer ring of the conductive bearing is interference-fitted with the rotating shaft.

[0008] According to an embodiment of the present invention, the conductive component of the motor rotor includes a carbon brush comprising an annular portion and bristles. The annular portion is interference-fitted onto the support column, and the bristles are disposed on the outer peripheral wall of the annular portion and are used to contact the rotating shaft.

[0009] According to an embodiment of the present invention, the conductive component of the motor rotor has a radially penetrating mounting hole at the end of the support column, and the flexible conductive strip is inserted and fixed at the mounting hole.

[0010] According to an embodiment of the present invention, in the conductive component of the motor rotor, the middle portion of the flexible conductive strip passes through the mounting hole, and the two ends of the flexible conductive strip are respectively fixed relative to the inner peripheral wall of the motor housing.

[0011] According to an embodiment of the present invention, the conductive component of the motor rotor has a terminal at the end of the flexible conductive strip. The terminal is attached to and connected to the inner peripheral wall of the motor housing and is detachably connected by a connector. The terminal is adapted to disconnect from the flexible conductive strip under the action of an external force when the conductive bearing fails.

[0012] According to an embodiment of the present invention, in the conductive component of the motor rotor, the two ends of the flexible conductive strip are radially opposite each other on the support column.

[0013] According to an embodiment of the present invention, the conductive component of the motor rotor includes a support column comprising a first mounting section, a second mounting section, and a third mounting section connected sequentially along the axial direction, wherein the outer diameters of the first mounting section, the second mounting section, and the third mounting section increase sequentially; the flexible conductive strip is connected to the first mounting section, the conductive bearing is sleeved on the second mounting section, and the carbon brush is sleeved on the outside of the third mounting section.

[0014] This invention also discloses an electric motor.

[0015] According to an embodiment of the present invention, an electric motor includes a motor housing, a motor rotor, a rotating shaft, and a conductive component of the motor rotor. The rotating shaft is rotatably supported within the motor housing, the motor rotor is sleeved outside the rotating shaft, an open mounting cavity is formed at the end of the rotating shaft, a support column is rotatably supported within the mounting cavity via a conductive bearing, and a carbon brush is sleeved on the portion of the rotating shaft located within the mounting cavity.

[0016] The motor according to an embodiment of the present invention further includes an oil seal, which is sleeved outside the support column and sealably fitted with the inner peripheral wall of the mounting cavity, wherein the conductive bearing and the carbon brush are both located on the side of the oil seal facing the mounting cavity.

[0017] The advantages of the electric motor and the conductive components of the motor rotor mentioned above compared to the prior art are the same, and will not be repeated here.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the internal structure of the conductive components of the motor rotor and the connection between the motor housing and the shaft in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the external structure connecting the conductive components of the motor rotor, the motor housing, and the shaft in an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the connection between the flexible conductive strip of the conductive component of the motor rotor and the motor housing in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the conductive structure of the conductive component of the motor rotor and the structure of the oil seal connected to the support column in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the carbon brush, a conductive component of the motor rotor, according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the structure of the support column of the conductive component of the motor rotor in an embodiment of the present invention.

[0026] Figure label:

[0027] Conductive component 100 of motor rotor,

[0028] Support column 1, first mounting section 11, second mounting section 12, third mounting section 13,

[0029] Conductive structure 2, conductive bearing 21, carbon brush 22, annular part 221, brush bristles 222, flexible conductive strip 23, terminal 231, oil seal 24, mounting hole 25.

[0030] 3. Shaft 4. Motor bearing 5. Motor housing Detailed Implementation

[0031] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following is for reference. Figures 1-6 The conductive component 100 of the motor rotor according to an embodiment of the present invention conducts current from the rotor to the motor housing 5 through two paths, reducing electro-corrosion of the motor bearing 4, enhancing the service life of the motor bearing 4, and reducing noise and vibration of the motor bearing 4; at the same time, the flexible conductive component 100 will not introduce NVH problems after the failure of the conductive bearing 21, and the flexible structure makes the conductive component 100 easy to install; the sealed cavity improves the operating environment of the carbon brush 22 and extends the life of the carbon brush 22.

[0033] like Figures 1-6 As shown, the conductive component 100 of the motor rotor according to an embodiment of the present invention includes a support column 1, a conductive bearing 21, a carbon brush 22, and a flexible conductive strip 23.

[0034] The conductive bearing 21 is rotatably supported between the support column 1 and the rotating shaft 3 of the motor rotor; the carbon brush 22 is sleeved on the outside of the support column 1 and contacts the rotating shaft 3; the flexible conductive strip 23 is connected to the support column 1 and is adapted to be connected to the motor housing 5.

[0035] In practice, the rotor is first fitted onto the outer circumferential wall of the rotating shaft 3, that is, in Figure 1The rotor is fitted onto the outer right side of the motor housing 5 via a rotating shaft 3. One end of the rotating shaft 3 is connected to the motor housing 5, and a motor bearing 4 is provided at the connection between the rotating shaft 3 and the motor housing 5. The motor bearing 4 separates the stationary motor housing 5 from the rotating rotor, thereby guiding the rotation of the rotating shaft 3 and reducing the friction between the rotating shaft 3 and the motor housing 5. The rotor generates current during rotation, and the current can easily corrode the motor bearing 4, reducing its service life.

[0036] Specifically, on support column 1... Figure 1 A conductive bearing 21 and a carbon brush 22 are fitted from left to right in the support column 1, and the conductive bearing 21 and carbon brush 22 are located between the outer peripheral wall of the support column 1 and the rotating shaft 3. The conductive bearing 21, carbon brush 22, and support column 1 form the main conductive structure 2. Of course, the positions of the conductive bearing 21 and carbon brush 22 can also be interchanged. The conductive bearing 21 and carbon brush 22 mainly serve to conduct electricity. The main component of carbon brush 22 is carbon, which is easily worn and should be regularly maintained and replaced, and carbon deposits should be removed. Generally, carbon brush 22 is fitted at the end of the support column 1, which facilitates the replacement of carbon brush 22. Figure 1 A carbon brush 22 is fitted onto the right end of the central support column 1, while Figure 1 The leftmost end of the support column 1 is connected to a flexible conductive strip 23, which is connected to the motor housing 5. At this time, the current transmitted from the rotor can be transmitted to the motor housing 5 through two paths. One path is from the shaft 3 to the carbon brush 22 and then to the support column 1, and then from the support column 1 to the flexible conductive strip 23, and then through the flexible conductive strip 23 to the motor housing 5. The other path is from the shaft 3 to the conductive bearing 21 and then to the support column 1, and then through the support column 1 to the motor housing 5. These two paths are two parallel lines for the current to be discharged from the rotor. This increases the number of current discharge paths and allows the current to be arbitrarily distributed between the conductive bearing 21 and the carbon brush 22. In this embodiment of the invention, the current is transmitted to the motor housing 5 through the support column 1. Through the design of two paths, the current on the rotor can be transmitted better, so that the current passing through the motor bearing 4 is less or non-existent. This can better protect the motor bearing 4 and prevent the motor bearing 4 from electro-corrosion, which would lead to reduced lifespan or noise and vibration problems.

[0037] In addition, the embodiment of the present invention uses a flexible conductive strip 23 connected to the motor housing 5, which is convenient to install and has very low requirements for the position of each component.

[0038] In some embodiments, the conductive bearing 21 is sleeved outside the support column 1, and the inner ring of the conductive bearing 21 is interference-fitted with the support column 1, and the outer ring of the conductive bearing 21 is interference-fitted with the rotating shaft 3.

[0039] Specifically, the conductive bearing 21 is sleeved on the outside of the support column 1, providing basic support for the support column 1. The outer ring of the conductive bearing 21 is interference-fitted with the rotating shaft 3, and there are balls between the outer and inner rings of the conductive bearing 21. When the rotating shaft 3 rotates, it will drive the outer ring of the conductive bearing 21 to rotate. The support column 1 can remain stationary or rotate within a small range. During the rotation of the rotating shaft 3, the current on the rotor can always reach the conductive bearing 21 through the rotating shaft 3, and then reach the support column 1 and the motor housing 5 through the conductive bearing 21, effectively extracting the current.

[0040] In some embodiments, the carbon brush 22 includes an annular portion 221 and bristles 222. The annular portion 221 is interference-fitted onto the support post 1, and the bristles 222 are disposed on the outer peripheral wall of the annular portion 221, and the bristles 222 are used to contact the rotating shaft 3. Figure 1 , Figure 4 and Figure 5 As shown, the annular portion 221 of the carbon brush 22 is connected to the outer peripheral wall of the support column 1, mainly for ease of connection. The bristles 222 of the outer peripheral wall of the carbon brush 22 are mainly used to transmit energy or signals between the inner wall of the semi-enclosed cavity of the rotating shaft 3 and the support column 1, so that the bristles 222 and the annular portion 221 are called a current transmission path. The position of the carbon brush 22 in this embodiment of the invention is different from that of the carbon brush 22 in the prior art, which can guide the rotor current.

[0041] In some embodiments, the end of the support column 1 is provided with a radially penetrating mounting hole 25, and the flexible conductive strip 23 is inserted and fixed at the mounting hole 25.

[0042] First, there can be one flexible conductive strip 23, which passes through the mounting hole 25 and extends in different directions at both ends and is fixed to the motor housing 5. Alternatively, there can be multiple flexible conductive strips 23, all fixed at the mounting hole 25 of the support column 1, and current is transmitted through the contact between the support column 1 and the flexible conductive strip 23. In this embodiment, the flexible conductive strip 23 is set to one, and it can be directly inserted through the mounting hole 25 to connect with the support column 1. This connection method is simple, allows for quick connection, and enables easy replacement of either the flexible conductive strip 23 or the support column 1. When there is only one flexible conductive strip 23, it is set to a suitable length. After the conductive bearing 21 cooperates with the support column 1, a certain resistance torque 1 is formed on the inner and outer rings. After the motor rotates, a resistance torque 2 is formed between the flexible conductive strip 23 and the mounting hole 25 of the support column 1. The resistance torque 1 is equal to the resistance torque 2, which ensures sufficient contact between the conductive strip and the support column 1.

[0043] In some embodiments, the middle part of the flexible conductive strip 23 passes through the mounting hole 25, and the two ends of the flexible conductive strip 23 are respectively fixed relative to the inner peripheral wall of the motor housing 5.

[0044] Reference Figure 4 As shown, when the flexible conductive strip 23 of this embodiment of the invention passes through the mounting hole 25 in the middle, the distance from the mounting hole 25 to the two free ends of the flexible conductive strip 23 is equal, which facilitates the balance of the force exerted by the flexible conductive strip 23 on the support column 1. The rotational freedom of the support column 1 is restricted by the flexible conductive strip 23 passing through the mounting hole 25. When the conductive bearing 21 is in normal working condition, the shaft 3 rotates relative to the support column 1. The support column 1 itself can remain stationary or only rotate within a small range. The rotational freedom is determined by the rotational freedom of the flexible conductive strip 23 passing through the mounting hole 25. The two ends of the flexible conductive strip 23 are respectively fixed relative to the inner peripheral wall of the motor housing 5, mainly to ensure that the flexible conductive strip 23 always maintains normal current transmission to the motor housing 5 when the conductive bearing 21 is in normal working condition. Of course, in practice, the flexible conductive strip 23 can also be made together with the support column 1, such as by welding them together, which can also eliminate the installation work.

[0045] In some embodiments, the end of the flexible conductive strip 23 is provided with a terminal 231, which is attached to the inner peripheral wall of the motor housing 5 and detachably connected by a connector. The terminal 231 is adapted to disconnect from the flexible conductive strip under the action of external force when the conductive bearing 21 fails.

[0046] In practice, refer to Figure 4As shown, the flexible conductive strip 23 is generally tubular in structure, and one end of the terminal 231 connected to the flexible conductive strip 23 is also tubular. The tubular structure of the flexible conductive strip 23 extends into the tubular structure of the terminal 231, and the two are pressed together. The pull-out force between the terminal 231 and the flexible conductive strip 23 can be controlled within a certain range. In addition, the terminal 231 is attached to the inner peripheral wall of the motor housing 5 and is detachably connected through a connector, which is convenient for connection. Furthermore, the use of the terminal 231 also provides support and strengthens the connection at the connection point with the motor housing 5. The pressing method between the flexible conductive strip 23 and the terminal 231 ensures that when the conductive bearing 21 fails, the aforementioned After the conductive bearing 21 and the support column 1 are engaged, a certain resistance torque 1 is formed in the inner and outer rings and begins to increase. The conductive bearing 21 and the support column 1 rotate together with the shaft 3, which causes the resistance torque 2 formed on the mounting hole 25 of the flexible conductive strip 23 and the support column 1 to begin to increase. When the pull force on the flexible conductive strip 23 is greater than the pull force between the terminal 231 and the flexible conductive strip 23, the flexible conductive strip 23 is pulled off at the pressure connection with the terminal 231. At this time, the shaft 3 of the motor can still operate normally. This design of the flexible conductive strip 23 allows the motor to operate normally after the conductive bearing 21 fails without introducing NVH problems. NVH problems refer to noise, vibration and acoustic roughness problems.

[0047] In some embodiments, the two ends of the flexible conductive strip 23 are distributed facing each other radially toward the support post 1. Specifically, refer to... Figure 3 As shown, the flexible conductive strip 23 is positioned at the two connection points of the motor housing 5 from the mounting hole 25 in the radial direction of the support column 1. This ensures that the flexible conductive strip 23 maintains a force balance on the support column 1 under the support of the inner ring of the conductive bearing 21 and the support column 1.

[0048] In some embodiments, refer to Figure 6 As shown, the support column 1 includes a first mounting section 11, a second mounting section 12, and a third mounting section 13 connected sequentially along the axial direction, with the outer diameters of the first mounting section 11, the second mounting section 12, and the third mounting section 13 increasing sequentially; a flexible conductive strip 23 is connected to the first mounting section 11, a conductive bearing 21 is sleeved on the second mounting section 12, and a carbon brush 22 is sleeved on the outside of the third mounting section 13.

[0049] In practice, the first mounting section 11 has mounting holes 25 for mounting the flexible conductive strip 23. The second mounting section 12 is fitted with a conductive bearing 21. The outer diameter of the third mounting section 13 is larger than that of the second mounting section 12. When the conductive bearing 21 is fitted into the second mounting section 12, one axial side of the conductive bearing 21 presses against the boss surface formed by the diameter change between the second mounting section 12 and the third mounting section 13, increasing the contact area between the conductive bearing 21 and the second mounting section 12, thereby enhancing the current transmission effect between the conductive bearing 21 and the support column 1. The third mounting section 13 is located at the end of the support column 1 and is used to mount the carbon brush 22. The carbon brush 22 is located at the end of the support column 1, which facilitates the replacement of the carbon brush 22. The outer diameter of the third mounting section 13 is larger than that of the second mounting section 12 and the first mounting section 11, which is suitable for mounting carbon brushes 22 smaller than the conductive bearing 21.

[0050] This invention also discloses an electric motor.

[0051] According to an embodiment of the present invention, the motor includes a motor housing 5, a motor rotor, a rotating shaft 3, and a conductive component 100 of the motor rotor. The rotating shaft 3 is rotatably supported inside the motor housing 5, the motor rotor is sleeved outside the rotating shaft 3, an open mounting cavity is formed at the end of the rotating shaft 3, a support column 1 is rotatably supported in the mounting cavity by a conductive bearing 21, and a carbon brush 22 is sleeved on the portion of the rotating shaft 3 located in the mounting cavity.

[0052] In practice, Figure 1 In this embodiment of the invention, the right side of the mounting cavity of the rotating shaft 3 is rotatably connected to the motor housing 5 by a motor bearing 4. Figure 1 The left side of the motor bearing 4 has a section with a diameter smaller than that of other parts of the shaft 3. This section of the shaft 3 located on the left side of the motor bearing 4 is called the conductive component mounting section. An open mounting cavity is located in the conductive component mounting section, and a support column 1 is provided in the open mounting cavity. The support column 1 is placed in the mounting cavity of the shaft 3, which facilitates the connection of one end of the support column 1 with the flexible conductive strip 23 to the motor housing 5. At the same time, it saves the installation space of the conductive component and does not affect the normal rotation of the shaft 3.

[0053] In some embodiments, an oil seal 24 is further included. The oil seal 24 is sleeved outside the support column 1 and seals against the inner peripheral wall of the mounting cavity. The conductive bearing 21 and the carbon brush 22 are both located on the side of the oil seal 24 facing into the mounting cavity. After the oil seal 24 is installed, the semi-enclosed cavity containing the conductive bearing 21 and the carbon brush 22 forms a sealed cavity. The conductive bearing 21 and the carbon brush 22 are located in a sealed cavity, which significantly improves the service life of the conductive bearing 21 and the carbon brush 22.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0056] In the description of this invention, "a plurality of" means two or more.

[0057] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0058] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A conductive component for an electric motor rotor, characterized in that, include: Support column; A conductive bearing, which is rotatably supported between the support column and the shaft of the motor rotor; A carbon brush, which is interference-fitted onto the support column and contacts the rotating shaft; A flexible conductive strip, which is connected to the support column and is adapted to be connected to the motor housing; The support column includes a first mounting section, a second mounting section, and a third mounting section connected sequentially along the axial direction, with the outer diameters of the first mounting section, the second mounting section, and the third mounting section increasing sequentially. The flexible conductive strip is connected to the first mounting section, the conductive bearing is sleeved on the second mounting section, and the axial side of the conductive bearing presses against the boss surface formed by the diameter change between the second mounting section and the third mounting section. The carbon brush is sleeved on the outside of the third mounting section. The support column has a radially penetrating mounting hole at its end, the flexible conductive strip passes through the mounting hole at its middle, and a terminal is provided at its end. The terminal is used to fix and connect to the inner peripheral wall of the motor housing. The flexible conductive strip and the terminal are connected by crimping, and the pull-out resistance at the crimping connection is configured such that when the conductive bearing fails and causes the support column to rotate with the shaft, the flexible conductive strip can be pulled out from the terminal.

2. The conductive component of the motor rotor according to claim 1, characterized in that, The conductive bearing is sleeved on the outside of the support column, and the inner ring of the conductive bearing is interference-fitted with the support column, and the outer ring of the conductive bearing is interference-fitted with the rotating shaft.

3. The conductive component of the motor rotor according to claim 1, characterized in that, The carbon brush includes an annular portion and bristles. The annular portion is interference-fitted onto the outside of the support column, and the bristles are disposed on the outer peripheral wall of the annular portion and are used to contact the rotating shaft.

4. The conductive component of the motor rotor according to claim 1, characterized in that, The terminal is fitted and connected to the inner peripheral wall of the motor housing and is detachably connected via a connector. The terminal is adapted to disconnect from the flexible conductive strip under external force when the conductive bearing fails.

5. The conductive component of the motor rotor according to claim 1, characterized in that, The two ends of the flexible conductive strip are distributed opposite each other in the radial direction of the support column.

6. An electric motor, characterized in that, The invention includes a motor housing, a motor rotor, a rotating shaft, and a conductive component of the motor rotor according to any one of claims 1-5, wherein the rotating shaft is rotatably supported within the motor housing, the motor rotor is sleeved outside the rotating shaft, an open mounting cavity is formed at the end of the rotating shaft, a support column is rotatably supported within the mounting cavity via the conductive bearing, and a carbon brush is sleeved on the portion of the rotating shaft located within the mounting cavity.

7. The motor according to claim 6, characterized in that, It also includes an oil seal, which is sleeved outside the support column and seals against the inner circumferential wall of the mounting cavity. The conductive bearing and the carbon brush are both located on the side of the oil seal facing the mounting cavity.

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