Motor bearing and motor for reducing motor rotor shaft electric corrosion
By integrating dual carbon brushes and an elastic floating structure into the motor bearing cage, the problem of electrical corrosion in the motor bearing is solved, stable current discharge and structural compactness are achieved, the failure rate is reduced, and the convenience and adaptability of maintenance are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGFENG MOTOR GRP
- Filing Date
- 2025-07-16
- Publication Date
- 2026-05-29
Smart Images
Figure CN224305613U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of motor bearing technology, and in particular to a motor bearing and motor for reducing electrical corrosion of the motor rotor shaft. Background Technology
[0002] With the increasing voltage of motors, the problem of bearing electro-corrosion is becoming more and more prominent. Motor bearing electro-corrosion is a systemic problem caused by partial discharge triggered by current passing through the bearing contact surface, leading to melting and wear of the metal surface. Its causes include multiple factors such as common mode voltage, shaft current, and lubrication failure. This problem is receiving increasing attention from the industry and has become a key challenge.
[0003] Currently, most solutions for electrical corrosion of motor bearings involve ceramic ball bearings or a separate conductive device. Ceramic ball bearings are expensive and cannot fundamentally solve the problem of electrical corrosion of the motor rotor shaft, while the solution of using a separate conductive device has significant limitations on the configuration of the internal space of the motor and takes up a lot of space. Utility Model Content
[0004] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.
[0005] Therefore, in a first aspect of this disclosure, a motor bearing for reducing electrical corrosion of the motor rotor shaft is provided, comprising a bearing body, a bearing cage, and a carbon brush assembly. The bearing cage has a bearing ball fixing portion and a carbon brush mounting portion. The carbon brush mounting portion protrudes from the bearing body along the axial direction of the bearing body. The carbon brush mounting portion has a plurality of carbon brush mounting positions, each of which is provided with the carbon brush assembly, and the plurality of carbon brush mounting positions are spaced apart circumferentially along the bearing cage. The carbon brush assembly includes a first carbon brush, a second carbon brush, and an elastic connector. The first carbon brush abuts against the motor housing, the second carbon brush abuts against the motor rotor shaft, and the elastic connector is used to apply abutting force between the first carbon brush and the second carbon brush.
[0006] In one feasible implementation, the carbon brush mounting position includes a mounting position body, the mounting position body having a mounting through hole radially formed along the bearing body, and the brush heads of the first carbon brush and the second carbon brush partially or completely protruding from the mounting through hole. Through the synergistic design of radial floating and protruding contact, while ensuring stable current discharge, the carbon brush life and maintenance convenience are significantly improved, representing a highly efficient supporting technology for solving the problem of bearing electro-corrosion.
[0007] In one feasible implementation, the mounting through hole is configured as an elongated hole, and the first carbon brush and the second carbon brush are clearance-fitted with the mounting through hole.
[0008] In one feasible implementation, the mounting through hole is designed to narrow from openings on both sides towards the middle.
[0009] In one feasible implementation, the number of carbon brush mounting positions is set to four, and the four carbon brush mounting positions are arranged opposite each other in pairs.
[0010] In one feasible implementation, a plurality of the carbon brush mounting positions are evenly arranged along the circumference of the bearing body.
[0011] In one feasible implementation, the first carbon brush and the second carbon brush are detachably connected to the elastic connector.
[0012] In one feasible implementation, the bearing ball fixing and the carbon brush mounting part are configured as an integrally formed structure.
[0013] In one feasible implementation, the resilient connector is configured as a spring and / or an elastic pad.
[0014] A second aspect of this disclosure provides an electric motor including the aforementioned motor bearing for reducing electrical corrosion of the motor rotor shaft.
[0015] Compared to existing technologies, this disclosure offers at least the following advantages: The first carbon brush contacts the motor housing, and the second carbon brush contacts the motor rotor shaft. Current on the motor rotor shaft is guided into the motor housing through the first and second carbon brushes in the carbon brush mounting portion on the bearing cage, along with the elastic connector, thus grounding the current and solving the problem of bearing electro-corrosion. The axially protruding carbon brush mounting portion is directly embedded in the internal space of the motor, eliminating the need for additional installation space. Compared to existing conductive devices, this disclosure features a compact structure and high integration with the bearing, reducing the failure rate of the conductive device. The elastic connector provides continuous contact force, enabling the first and second carbon brushes to achieve better physical contact with the housing and motor rotor shaft, ensuring a tight fit between the first and second carbon brushes and the contact surface, compensating for gap changes caused by axial displacement or vibration of the motor rotor shaft. This disclosure integrates dual carbon brushes and an elastic floating structure in the bearing cage, achieving full-spectrum discharge of shaft current at low cost and high compactness, fundamentally blocking the electro-corrosion path. It also considers maintainability and adaptability to operating conditions, resulting in significantly better overall performance than traditional insulated bearings or external conductive devices. Attached Figure Description
[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.
[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.
[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0019] Figure 1 This is a schematic diagram of the bearing cage structure disclosed herein;
[0020] Figure 2 This is a schematic diagram of the structure of this disclosure assembled on an electric motor;
[0021] Figure 3 This is a schematic cross-sectional view of the structure disclosed herein;
[0022] Figure 4 This is a schematic diagram of the carbon brush assembly structure disclosed herein.
[0023] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:
[0024] 100 - Motor housing; 200 - Motor rotor shaft;
[0025] 1-Bearing body; 2-Bearing cage; 21-Bearing ball holder; 22-Carbon brush mounting part; 221-Mounting position body; 222-Mounting through hole; 3-Carbon brush assembly; 31-First carbon brush; 32-Second carbon brush; 33-Elastic connector. Detailed Implementation
[0026] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.
[0027] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.
[0028] Currently, most solutions for electrical corrosion of motor bearings involve ceramic ball bearings or a separate conductive device. Ceramic ball bearings are expensive and cannot fundamentally solve the problem of electrical corrosion of the motor rotor shaft, while the solution of using a separate conductive device has significant limitations on the configuration of the internal space of the motor and takes up a lot of space.
[0029] Based on this, this disclosure provides a motor bearing for reducing electro-corrosion of the motor rotor shaft. The first carbon brush 31 contacts the motor housing 100, and the second carbon brush 32 contacts the motor rotor shaft 200. Current on the motor rotor shaft 200 is guided into the motor housing 1 through the first and second carbon brushes 31 and 32 in the carbon brush mounting portion 22 on the bearing cage 2 and the elastic connector 33, thus grounding the current and solving the problem of bearing electro-corrosion. The axially protruding carbon brush mounting portion 22 is directly embedded in the internal space of the motor, requiring no additional installation space. Compared to existing conductive devices, this disclosure has a compact structure and a high degree of integration with the bearing, and reduces the failure rate of the conductive device. The elastic connector 33 provides continuous contact force, enabling the first and second carbon brushes 31 and 32 to achieve better effective physical contact with the housing 100 and the motor rotor shaft 200, ensuring a tight fit between the first and second carbon brushes 31 and the contact surface, compensating for gap changes caused by axial displacement or vibration of the motor rotor shaft 200. This disclosure achieves full-spectrum discharge of shaft current with low cost and high compactness by integrating dual carbon brushes and an elastic floating structure in the bearing cage 2, fundamentally blocking the path of electro-corrosion, while taking into account maintainability and adaptability to operating conditions. Its overall performance is significantly better than that of traditional insulated bearings or external conductive devices.
[0030] The following detailed description uses specific examples to illustrate this motor bearing for reducing electrical corrosion of the motor rotor shaft:
[0031] Reference Figures 1 to 4 As shown, a first aspect of this disclosure provides a motor bearing for reducing electrical corrosion of the motor rotor shaft, including a bearing body 1, a bearing cage 2, and a carbon brush assembly 3. The bearing cage 2 has a bearing ball fixing 21 and a carbon brush mounting portion 22. The carbon brush mounting portion 22 protrudes from the bearing body 1 along the axial direction of the bearing body 1. The carbon brush mounting portion 22 has multiple carbon brush mounting positions, each of which is provided with a carbon brush assembly 3, and the multiple carbon brush mounting positions are spaced apart circumferentially along the bearing cage 2. The carbon brush assembly 3 includes a first carbon brush 31, a second carbon brush 32, and an elastic connector 33. The first carbon brush 31 abuts against the motor housing 100, the second carbon brush 32 abuts against the motor rotor shaft 200, and the elastic connector 33 is used to apply the abutting force of the first carbon brush 31 and the second carbon brush 32.
[0032] The first carbon brush 31 of this disclosure contacts the motor housing 100, and the second carbon brush 32 contacts the motor rotor shaft 200. The current on the motor rotor shaft 200 is guided into the motor housing 1 through the first and second carbon brushes 31 and 32 in the carbon brush mounting portion 22 on the bearing cage 2 and the elastic connector 33, thus grounding the current and solving the problem of bearing electro-corrosion. The axially protruding carbon brush mounting portion 22 is directly embedded in the internal space of the motor, requiring no additional installation space. Compared with existing conductive devices, this disclosure has a compact structure and a high degree of integration with the bearing, and reduces the failure rate of the conductive device. It should be noted that the conductivity principle of the carbon brushes essentially utilizes the electronic conductivity characteristics of graphite (or composite materials) to form a current path through physical contact with the motor rotor shaft 200. Its core lies in the synergistic effect of the material's electron migration capability, the stability of the contact interface, and the lubrication mechanism, thereby achieving reliable conductivity during dynamic friction. To ensure better physical contact between the first carbon brush 31 and the second carbon brush 32 and the housing 100 and the motor rotor shaft 200, the elastic connector 33 of this disclosure provides a continuous abutment force, ensuring that the first carbon brush 31 and the second carbon brush 32 are tightly fitted with the contact surface, compensating for clearance changes caused by axial displacement or vibration of the motor rotor shaft 200. This disclosure integrates a dual carbon brush + elastic floating structure through the bearing cage 2, achieving full-spectrum discharge of shaft current at low cost and high compactness, fundamentally blocking the electro-corrosion path, while also considering maintainability and adaptability to operating conditions. Its overall performance is significantly superior to traditional insulated bearings or external conductive devices.
[0033] Specifically, the first carbon brush 31 and the second carbon brush 32 of this disclosure can be configured as a cube, cuboid, or cylinder, etc. This disclosure specifically uses a cuboid to increase the contact area between the carbon brush and the corresponding component. The carbon brush mounting part 22 of this disclosure can be configured as an open structure or a closed structure. For example, the open structure can be a slot, in which the first carbon brush 31 and the second carbon brush 32 are engaged. The slot is configured as a through slot, with the two ends of the through slot facing the housing 100 and the electronic rotor shaft 200 respectively, so that the first carbon brush 31 and the second carbon brush 32 can abut against the housing 100 and the electronic rotor shaft 200 respectively. The fixing method of the first carbon brush 31 and the second carbon brush 32 in the slot can be a clamp, a buckle, etc. It should be noted that the choice of fixing method must ensure that the elastic connector 33 can still allow the first carbon brush 31 and the second carbon brush 32 to move towards the abutment. The fixing aims to prevent the first carbon brush 31 and the second carbon brush 32 from dislodging from the slot. In the embodiment with a closed structure, the carbon brush mounting part 22 can be a sleeve with openings on both sides. The carbon brush assembly 3 is placed in the sleeve, so that the first carbon brush 31 and the second carbon brush 32 protrude from the openings on both sides of the sleeve and abut against the housing 100 and the electronic rotor shaft 200. The closed structure of the carbon brush mounting part 22 occupies more space than the open structure and is more suitable for the smaller space of the motor rotor shaft area. The open structure of the carbon brush mounting part 22 provides better protection for the carbon brush assembly 3 compared to the closed structure.
[0034] In some embodiments, the carbon brush mounting position includes a mounting position body 221, the mounting position body 221 having a mounting through hole 222 along the radial direction of the bearing body 1, and the brush heads of the first carbon brush 31 and the second carbon brush 32 partially or entirely protruding from the mounting through hole 222.
[0035] In this embodiment, the brush heads of the first carbon brush 31 and the second carbon brush 32 protrude partially or completely from the mounting through hole 222, directly pressing against the motor rotor shaft 200 and the housing 100, eliminating the risk of poor contact caused by assembly gaps. Compared to fixed embedded carbon brushes, the protruding design, combined with the elastic connector 33, can adaptively compensate for axial movement and maintain constant contact pressure. The mounting through hole 222 of this disclosure is opened radially along the bearing, allowing the carbon brush to make slight radial displacements (e.g., ±0.5mm), automatically tracking the thermal deformation or vibration offset of the rotor shaft. Compared to traditional fixed mounting (e.g., a receiving groove structure), this design significantly reduces the carbon brush wear rate. Furthermore, the first carbon brush 31 and the second carbon brush 32 have anti-shake redundancy; when the brush head protrudes partially (not fully protruding), the section remaining inside the mounting through hole 222 forms a guide wall constraint, suppressing circumferential deflection of the carbon brush and ensuring the contact area between the brush surface and the housing 100 and the motor rotor shaft 200. Furthermore, wear monitoring of the first carbon brush 31 and the second carbon brush 32 can be visualized. The exposed brush head allows direct observation of the wear amount. Scale markings on the first carbon brush 31 and the second carbon brush 32 enable inspection without disassembly, thus improving maintenance response speed. This embodiment, through the synergistic design of radial floating and protruding contact, significantly improves carbon brush life and maintenance convenience while ensuring stable current discharge, providing a highly efficient supporting technology for solving bearing electro-corrosion problems.
[0036] In some embodiments, the mounting through hole 222 is configured as an elongated hole, and the first carbon brush 31 and the second carbon brush 32 are clearance-fitted with the mounting through hole 222.
[0037] In this embodiment, the technical solution sets the mounting through hole 222 as an elongated hole, and forms a clearance fit between the first carbon brush 31, the second carbon brush 32 and the through hole. Specifically, the clearance fit is in the range of 0.1–0.3 mm. The clearance fit design allows the carbon brush to have a margin of movement, enabling it to automatically track the radial runout or vibration offset of the rotor shaft and maintain uniform contact between the brush surface and the contact surface. The elongated hole provides a larger mounting position tolerance, allowing for minor assembly errors between the bearing and the carbon brush assembly, avoiding carbon brush jamming or poor contact due to accumulated tolerances. Furthermore, the elongated hole and the clearance form a thermal expansion buffer zone, preventing the carbon brush from being squeezed and deformed by the hole wall after thermal expansion, and preventing a sudden increase in contact pressure or carbon brush breakage due to expansion jamming. In terms of airflow, the clearance forms an annular airflow channel, which can accelerate the dissipation of frictional heat from the carbon brush. This embodiment, through the synergistic mechanism of elongated hole guidance and clearance floating, solves the core contradiction between dynamic carbon brush tracking and thermal management with structural innovation, significantly improving the reliability of the shaft current discharge system.
[0038] In some embodiments, the mounting through-hole 222 is necked from openings on both sides toward the middle portion.
[0039] In this embodiment, the bearing mounting through-hole 222 adopts a "necked-in-the-middle design with openings on both sides" (i.e., the diameter of the openings at both ends is larger than the diameter of the middle hole). The necked structure forms a radial limiting ring, constraining the circumferential swing angle of the carbon brush within the through-hole, preventing the carbon brush from tilting and detaching from the contact surface due to vibration or torque. Compared to a straight cylindrical through-hole, this reduces the probability of carbon brush deflection failure. The large openings on both sides act as flared inlet ends, guiding the carbon brush to quickly insert into the necked positioning area, reducing assembly precision requirements. The necked-in shape forms a mechanical locking point, preventing the carbon brush from accidentally dislodging during axial vibration (especially in inverted installation conditions). The clearance fit between the necked-in shape and the carbon brush (0.1–0.3 mm) provides uniform radial support force, avoiding abnormal wear caused by localized stress concentration.
[0040] Specifically, such as Figure 4 As shown, during assembly, the elastic connector 33 is provided in the necked portion, and the necked portion forms a mechanical locking point to prevent the first carbon brush 31 and the second carbon brush 32 from accidentally coming out of the mounting through hole 222 during axial vibration. Moreover, when the present disclosure is assembled on the motor rotor shaft 200, there is no need to additionally restrict the displacement of the carbon brush assembly 3.
[0041] In some embodiments, a plurality of carbon brush mounting positions are uniformly arranged along the circumference of the bearing body 1.
[0042] In this embodiment, the technical solution of uniformly arranging multiple carbon brushes along the circumference of the bearing body significantly improves the stability and reliability of motor operation through spatial symmetry and load balancing design. The circumferentially distributed carbon brushes form a parallel conductive network, and the current carried by a single carbon brush is reduced to a fraction of the total current, thus avoiding local overload.
[0043] In some embodiments, the number of carbon brush mounting positions is set to four, with the four carbon brush mounting positions arranged opposite each other in pairs.
[0044] In this embodiment, the carbon brush mounting positions are arranged in a four-by-four configuration, achieving multiple performance improvements through spatial symmetry and load balancing design. The four carbon brushes are connected in parallel to shunt the current, reducing the current carried by a single carbon brush to 25% of the total current, thus reducing the risk of localized overheating. The symmetrical layout forms a low-impedance circuit, improving the uniformity of current distribution in the armature winding. Furthermore, even if a single carbon brush fails, the remaining carbon brushes can still maintain ≥75% of their rated current conduction capacity, significantly improving the system's fault tolerance.
[0045] Specifically, the paired carbon brush assemblies counteract the unilateral magnetic pull, effectively reducing the radial vibration amplitude of the rotor shaft, minimizing abnormal bearing wear, and extending service life. A cross pressure field is formed in the diagonal carbon brush assemblies, automatically compensating for slight rotor shaft runout to improve the uniformity of carbon brush surface contact. The symmetrical layout of the four carbon brush mounting positions, arranged in pairs, optimizes the heat dissipation path, allowing heat to be quickly dissipated through the four-way mounting body, reducing regional temperature rise. This embodiment, with its four paired carbon brushes, employs a triple mechanism of current sharing and loss reduction, force system balance, and redundancy fault tolerance to significantly improve system vibration resistance and maintenance economy while ensuring current conduction stability.
[0046] In some embodiments, the first carbon brush 31 and the second carbon brush 32 are detachably connected to the resilient connector 33.
[0047] In this embodiment, the first carbon brush 31 and the second carbon brush 32 are detachably connected to the elastic connector 33, offering multiple advantages in terms of conductive contact stability, maintenance convenience, and structural adaptability. Since carbon brushes are easily worn components, the detachable connection allows for individual removal of either the first carbon brush 31 or the second carbon brush 32 without disassembling the entire bearing cage 2. When either the first carbon brush 31 or the second carbon brush 32 wears to its limit, simply loosening the elastic connector 33 allows for the removal of the old carbon brush and the installation of a new one, reducing maintenance time. This also avoids the high costs associated with replacing the entire carbon brush assembly 3.
[0048] In terms of modular maintenance, the elastic connector 33 is an independent component that can be maintained separately from the first carbon brush 31 and the second carbon brush 32. If the elastic connector 33 fails due to fatigue after long-term use (such as loss of elasticity), the elastic connector can be replaced separately without replacing the first carbon brush 31 and the second carbon brush 32 at the same time, further reducing maintenance costs.
[0049] Specifically, the detachable connection between the first carbon brush 31 and the second carbon brush 32 and the elastic connector 33 can be configured such that the tails of the first carbon brush 31 and the second carbon brush 32 are provided with convex locking blocks, and the elastic connector 33 has matching concave locking grooves, which can be locked / released by vertical pressing. Alternatively, the backs of the first carbon brush 31 and the second carbon brush 32 are embedded with T-shaped guide rails, pushed in along the arc-shaped slide of the elastic connector 33, and the ends are limited by spring locking pins to improve the anti-vibration offset capability. Alternatively, the elastic connector 33 adopts a double conical collar (cone angle 12.5°-17°), tightening the nut causes the inner and outer rings to expand radially, simultaneously clamping the tails of the first carbon brush 31 and the second carbon brush 32 to the cavity wall of the mounting through hole 222. Disassembly can be achieved by loosening the nut in the opposite direction. Alternatively, the elastic connector 33 has a built-in V-shaped spring plate, which automatically engages with the fixing boss when the first carbon brush 31 and the second carbon brush 32 are inserted, and disassembly is achieved by pressing the unlocking button in the middle of the spring plate.
[0050] In some embodiments, the bearing ball retainer 21 and the carbon brush mounting portion 22 are configured as an integrally formed structure.
[0051] In this embodiment, the one-piece molding structure (such as metal die casting or injection molding) makes the bearing ball fixing part 21 and the carbon brush mounting part 22 a single solid, avoiding the bolt connections or weld gaps of traditional split structures. One-piece casting eliminates the assembly gaps of split structures and improves the overall resistance to deformation.
[0052] In some embodiments, the resilient connector 33 of this disclosure is configured as a spring and / or a resilient pad.
[0053] In this embodiment, the spring continuously provides axial elastic force, ensuring that the first carbon brush 31 and the second carbon brush 32 always maintain constant pressure against the commutator surface, preventing poor contact due to brush shortening. The elastic gasket disperses high-frequency mechanical vibration energy, reducing the amplitude transmitted to the carbon brushes. Specifically, the spring can be made of stainless steel (corrosion resistant), and the elastic gasket can be made of fluororubber. This solution, through the core mechanism of "elastic energy storage + deformation compensation," simultaneously addresses three major pain points: pressure control, vibration suppression, and prevention of loosening failure. While ensuring current transmission stability, it increases the overall lifespan of the carbon brush system by more than 40%, making it particularly suitable for high-dynamic load scenarios such as electric vehicle drive motors and industrial frequency converters.
[0054] In a second aspect of this disclosure, an electric motor is provided, characterized by including the above-described motor bearing for reducing electrical corrosion of the motor rotor shaft.
[0055] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0056] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., 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 disclosure and simplifying the description, and do not indicate or imply that the device or unit 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 disclosure.
[0057] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. 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.
[0058] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.
Claims
1. A motor bearing for reducing electrical corrosion of the motor rotor shaft, characterized in that, The bearing assembly includes a bearing body, a bearing cage, and a carbon brush assembly. The bearing cage has a bearing ball retaining portion and a carbon brush mounting portion, which protrudes from the bearing body along its axial direction. The carbon brush mounting part has multiple carbon brush mounting positions, each of which is provided with a carbon brush assembly, and the multiple carbon brush mounting positions are spaced apart along the circumferential direction of the bearing cage. The carbon brush assembly includes a first carbon brush, a second carbon brush, and an elastic connector. The first carbon brush abuts against the motor housing, the second carbon brush abuts against the motor rotor shaft, and the elastic connector is used to apply the abutting force between the first carbon brush and the second carbon brush.
2. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 1, characterized in that, The carbon brush mounting position includes a mounting position body, and the mounting position body has a mounting through hole along the radial direction of the bearing body. The brush heads of the first carbon brush and the second carbon brush partially or completely protrude from the mounting through hole.
3. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 2, characterized in that, The mounting through hole is configured as an elongated hole, and the first carbon brush and the second carbon brush are clearance-fitted with the mounting through hole.
4. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 2, characterized in that, The mounting through hole is designed to narrow from the openings on both sides towards the middle.
5. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 1, characterized in that, The number of carbon brush mounting positions is set to four, and the four carbon brush mounting positions are arranged opposite each other in pairs.
6. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 1, characterized in that, The multiple carbon brush mounting positions are evenly arranged along the circumference of the bearing body.
7. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 1, characterized in that, The first carbon brush and the second carbon brush are detachably connected to the elastic connector.
8. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 1, characterized in that, The bearing ball fixing and the carbon brush mounting part are configured as an integral molding structure.
9. The motor bearing for reducing electrical corrosion of the motor rotor shaft according to claim 1, characterized in that, The elastic connector is configured as a spring and / or an elastic pad.
10. An electric motor, characterized in that, Motor bearings that reduce electrical corrosion of motor rotor shafts, as described in any one of claims 1 to 9.