Motor shaft resolver support assembly

Abstract

The utility model relates to a motor shaft resolver support assembly, and belongs to the technical field of motor protection, the motor shaft resolver support assembly comprises a resolver support, a motor shaft of a motor penetrates through the center of the resolver support, the resolver support is provided with a resolver on one side of a base of the motor, and a rotor of the resolver is coaxially connected with the motor shaft. A carbon brush is arranged on the side, away from the rotary transformer, of the rotary transformer support in the circumferential direction, one end of the carbon brush abuts against the outer side face of the motor shaft, and the carbon brush is provided with a movable device used for changing the magnitude of pressure applied to the motor shaft by the carbon brush. The problem of electric corrosion caused by overcurrent of the electric bearing under different working conditions can be solved.

Description

Technical Field

[0001] This application relates to the field of motor protection technology, and in particular to a motor shaft rotatable bracket assembly. Background Technology

[0002] Electric motors play a vital role in modern industry and daily life, and their stability and reliability directly affect the operating efficiency and lifespan of equipment. With the rapid development of new energy vehicles, the performance optimization of drive motors, as one of the core components, has received much attention. However, drive motors may generate shaft current during operation. If this current flows through the bearings, it will lead to bearing electro-corrosion, thereby affecting the overall performance and lifespan of the motor. To solve this problem, the industry is constantly exploring new technologies and design solutions to improve the operational stability of motors and extend their service life.

[0003] In traditional motor design, drive motors generally lack preventative designs against bearing electro-corrosion. However, in recent years, due to in-depth research and analysis on bearing electro-corrosion, the following solutions have gradually emerged in motor design: replacing with ceramic bearings to completely block the stator and rotor; adding conductive rings to eliminate the potential difference between the stator and rotor; coating the motor shaft bearing mounting location to form an insulating layer, blocking the current path between the stator and rotor; and fabricating insulating end caps to insulate the bearing housing of the end caps, thus blocking the current path between the stator and rotor.

[0004] The main problem with the aforementioned existing technologies is that they may not be able to maintain a stable protective effect under complex operating conditions. Furthermore, after prolonged operation, these solutions may experience a decline in protective performance due to material aging or environmental factors, thus failing to meet the precise prevention requirements for motor shaft electrical corrosion under different operating conditions. Therefore, how to ensure the solution of bearing electrical corrosion problems while providing more stable and reliable protective effects for different operating conditions has become an urgent technical challenge. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a motor shaft reversible bracket assembly to solve the problem of electro-corrosion caused by overcurrent in the electric bearing under different operating conditions.

[0006] This application provides a motor shaft rotatable bracket assembly with the following technical solution:

[0007] A motor shaft resolver bracket assembly includes a resolver bracket through which a motor shaft passes. A resolver is mounted on one side of the motor base of the resolver bracket, and the rotor of the resolver is coaxially connected to the motor shaft. Carbon brushes are circumferentially mounted on the side of the resolver bracket away from the resolver, with one end of each carbon brush abutting against the outer surface of the motor shaft. Each carbon brush is equipped with a movable device for changing the pressure applied by the carbon brush to the motor shaft.

[0008] By adopting the above technical solution, one end of the carbon brush abuts against the outer side of the motor shaft, and the pressure of the carbon brush on the motor shaft is adjusted by the movable device, so that the motor shaft can make good contact with the carbon brush under different working conditions, maintain low resistance properties, further improve reliability and applicability, and effectively reduce contact resistance.

[0009] This application further provides that: the resolver bracket is provided with several terminals circumferentially on the side away from the resolver via fastening parts; the movable device includes a first bent brush arm, which is located at the end of the carbon brush away from the motor shaft, and the end of the first bent brush arm away from the carbon brush is fixedly connected to a terminal.

[0010] By adopting the above technical solution, the carbon brush is in direct contact with the motor shaft, and the contact pressure is determined by the spring force after the first bent brush arm is bent. Thus, even when the axial displacement of the motor shaft occurs, the carbon brush can maintain a stable contact pressure on the motor shaft. Furthermore, by disassembling the fastening parts, the terminal and the first brush arm can be quickly replaced. This solution is suitable for situations where the motor shaft is subjected to heavy loads in a short period of time for anti-electrolytic corrosion protection.

[0011] This application further provides that: the resolver bracket has several protrusions integrally formed circumferentially on the side away from the resolver; the movable device includes a second bent brush arm; one end of the second bent brush arm is provided with a terminal; the terminal is set on one side of the protrusion by fastening parts; the end of the second bent brush arm away from the terminal is fixedly connected to the end of the carbon brush away from the motor shaft; the length of the terminal, the second bent brush arm and the carbon brush protruding from the resolver bracket does not exceed the length of the protrusions from the resolver bracket.

[0012] By adopting the above technical solution, since the contact pressure is determined by the spring force after the second bent brush arm is bent, the contact pressure of the carbon brush on the motor shaft is maintained when the axial direction of the motor shaft rotation is offset. Furthermore, the boss protection terminal and the connected second brush arm and carbon brush can reduce wear caused by external factors, thereby enabling the terminal, brush arm and carbon brush to be used for a long time. This is suitable for situations where the motor shaft is subjected to balanced load and anti-electrolytic corrosion work for a long time.

[0013] This application further provides that: the resolver bracket is provided with a plurality of carbon brush holders circumferentially on the side away from the resolver via fastening parts, and each carbon brush holder has a first movable cavity radially along the motor shaft. The movable device includes a spring, which is disposed on the inner wall of the carbon brush holder located in the first movable cavity away from the motor shaft. The end of the spring near the motor shaft is fixedly connected to the end of the carbon brush away from the motor shaft. The carbon brush is movably connected in the first movable cavity, and the spring always drives the carbon brush to move toward the motor shaft.

[0014] By adopting the above technical solution, the spring applies contact pressure to the carbon brush in the direction of the motor shaft, and the carbon brush is in direct contact with the motor shaft. The contact pressure is determined by the elastic force of the spring. Thus, even when the axial displacement of the motor shaft occurs, the carbon brush can still maintain its ability to prevent electro-corrosion of the motor shaft. The carbon brush holder can protect the carbon brush, reduce external wear on the carbon brush, and the carbon brush holder, spring, and carbon brush can be quickly disassembled by removing the fastening parts. It is suitable for situations where the motor shaft is subjected to heavy loads in environments with high dust levels or other external factors, and is designed to prevent electro-corrosion of the motor shaft.

[0015] This application further provides that: the resolver bracket has several support blocks integrally formed circumferentially on the side away from the resolver bracket, and a carbon brush cover is provided on the side of the support block away from the resolver bracket by fastening parts. A second movable cavity is formed between the carbon brush cover and the support block. The movable device includes a spring, which is disposed on the inner wall of the support block located in the second movable cavity. The end of the spring near the motor shaft is fixedly connected to the end of the carbon brush away from the motor shaft. The carbon brush is movably connected in the second movable cavity, and the spring always drives the carbon brush to move in the direction of the motor shaft.

[0016] By adopting the above technical solution, the spring applies contact pressure to the carbon brush towards the motor shaft, so that the carbon brush generates contact pressure on the motor shaft, minimizing the reduction of the carbon brush's ability to prevent electro-corrosion. The carbon brush holder can protect the carbon brush and reduce external wear on the carbon brush. The spring is fixed to the resolver bracket and is separate from the carbon brush cover that needs to be disassembled and repaired, reducing the problem of unstable spring connection due to loosening of fasteners. It is suitable for situations where the motor shaft is subjected to balanced load operation and electro-corrosion prevention in environments with high dust levels and other external factors.

[0017] This application further provides that: the resolver bracket has a cavity at one end facing the resolver, and a grounding ring is provided in the cavity of the resolver bracket; the movable device includes a carbon fiber bundle, and the grounding ring wraps around the motor shaft through the carbon fiber bundle.

[0018] By adopting the above technical solution, a flexible conductive channel is formed by wrapping the motor shaft with carbon fiber bundles, and the contact pressure of the grounding ring is determined by the rebound force of the carbon fiber bundles. This can not only adapt to the deformation of the motor shaft under different speeds and loads in real time to ensure stable output of shaft current, but also form a low impedance circuit through the built-in grounding ring in the cavity, effectively suppressing the electro-corrosion phenomenon caused by the accumulation of shaft current.

[0019] This application further specifies that the carbon brush is fixedly connected to the first bent brush arm by a snap fastener, and the first bent brush arm is fixedly connected to the terminal by riveting.

[0020] By adopting the above technical solution, the snap-fit ​​connection can achieve the purpose of quick disassembly of carbon brush and first bent brush arm, and the first bent brush arm and terminal are fixed by riveting, which can make the connection more stable when the motor shaft is subjected to large load operation for anti-electrolytic corrosion in a short time.

[0021] This application further specifies that the carbon brush and the second bent brush arm are fixedly connected by a snap fastener.

[0022] By adopting the above technical solution, when the carbon brush fails due to wear, the carbon brush can be removed and replaced simply by disassembling the clip, without disassembling the second bent brush arm. This is suitable for motor shaft anti-electrolytic corrosion work that requires balanced load over a long period of time.

[0023] This application further specifies that the resolver bracket is located on one side of the motor resolver cover plate.

[0024] By adopting the above technical solution, when the entire anti-electro-corrosion component needs to be disassembled, it can be quickly replaced without disassembling the motor, making it more convenient to confirm its status in use.

[0025] In summary, this application has the following beneficial effects:

[0026] This application enables the carbon brush to conduct shaft current through contact with the motor shaft, minimizing current flow through the bearing, thereby reducing the risk of bearing electro-corrosion and extending the service life of the bearing and motor. At the same time, the carbon brush adjusts the pressure on the motor shaft through a movable device to ensure low-resistance contact between the carbon brush and the motor shaft under different operating conditions, further improving the stability of current conduction. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0028] Figure 2 This is a front view structural diagram of Embodiment 1 of this application.

[0029] Figure 3 This is a partial cross-sectional structural diagram of Embodiment 1 of this application.

[0030] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0031] Figure 5 This is a front view structural diagram of Embodiment 2 of this application.

[0032] Figure 6 This is a partial cross-sectional structural diagram of Embodiment 2 of this application.

[0033] Figure 7 This is a schematic diagram of the overall structure of Embodiment 3 of this application.

[0034] Figure 8 This is a front view structural diagram of Embodiment 3 of this application.

[0035] Figure 9 This is a partial cross-sectional structural diagram of Embodiment 3 of this application.

[0036] Figure 10 This is a schematic diagram of the overall structure of Embodiment 4 of this application.

[0037] Figure 11 This is a front view structural diagram of Embodiment 4 of this application.

[0038] Figure 12 This is a partial cross-sectional structural diagram of Embodiment 4 of this application.

[0039] Figure 13 This is a schematic diagram of the overall structure of Embodiment 5 of this application.

[0040] Figure 14 This is a front view structural diagram of Embodiment 5 of this application.

[0041] Figure 15 This is a partial cross-sectional structural diagram of Embodiment 5 of this application.

[0042] Reference numerals: 1. Resolver bracket; 10. Boss; 11. Support block; 2. Motor shaft; 3. Resolver; 4. Carbon brush; 5. Movable device; 50. Terminal; 51. First bent brush arm; 52. Second bent brush arm; 53. Carbon brush holder; 54. Spring; 55. Carbon brush cover; 6. Grounding ring. Detailed Implementation

[0043] The following is in conjunction with the appendix Figures 1 to 15 This application will be described in further detail.

[0044] Example 1:

[0045] refer to Figures 1 to 3In this embodiment, a motor shaft resolver bracket assembly includes a resolver bracket 1, through which a motor shaft 2 of the motor passes. A resolver 3 is fixedly connected to one side of the motor base of the resolver bracket 1. The rotor of the resolver 3 is coaxially connected to the motor shaft 2, and the connection between the resolver 3 and the motor shaft 2 enables synchronous rotation. The angular displacement and angular velocity of the motor shaft 2 are converted into electrical signals through electromagnetic induction, providing necessary feedback information to the motor control system. Carbon brushes 4 are circumferentially arranged on the side of the resolver bracket 1 away from the resolver 3. The portion of the carbon brushes 4 in contact with the motor shaft 2 is coated with carbon powder, effectively reducing resistance. The other parts are made of copper. When the motor rotates during operation, the carbon powder adheres to the contact points of the motor shaft 2, achieving lubrication and reducing wear, thus extending service life. One end of the carbon brush 4 abuts against the outer side of the motor shaft 2. The carbon brush 4 is equipped with a movable device 5, which can change the pressure applied by the carbon brush 4 to the motor shaft 2, so that the motor shaft 2 can have good contact with the carbon brush 4 under different working conditions, maintain low resistance properties, minimize the current passing through the bearing, and thus improve the stability of motor operation.

[0046] Furthermore, the resolver 3, motor shaft 2, and carbon brush 4 are all existing parts designs on the market, eliminating the need for separate design and mold making, thus reducing development costs. The resolver bracket 1, however, requires customized design based on different design schemes, but most of its features remain consistent with the existing resolver 3 mounting bracket. Simultaneously, to ensure the effective lifespan of the resolver bracket 1 assembly solution for addressing the current in the motor shaft 2, certain requirements are placed on the roundness, roughness, and cleanliness of the contact points on the motor shaft 2. The installation method for the resolver 3 and resolver bracket 1 is the same as the normal production process and will not be specifically described here. All components involved in the current loop are made of low-resistance materials to reduce loop resistance, ensuring rapid balance of the potential difference between the motor stator and rotor, and reducing the probability of shaft current occurrence.

[0047] Furthermore, the resolver bracket 1, located on the side away from the resolver 3, is circumferentially fixedly connected to several terminals 50 by fastening parts. In this embodiment, two terminals 50 are provided. The movable device 5 includes a first bending brush arm 51. Preferably, the first bending brush arm 51 is made of copper, which does not undergo plastic deformation after bending. Moreover, the first bending brush arm 51 is a commercially available part design, eliminating the need for separate design and mold making, thus reducing development costs. The first bending brush arm 51 is located at the end of the carbon brush 4 away from the motor shaft 2, and the end of the first bending brush arm 51 away from the carbon brush 4 is fixedly connected to a terminal 50. In its free state without the carbon brush 4 installed, the first bending brush arm 51 can contact the surface of the motor shaft 2, thereby generating contact pressure between the carbon brush 4 installed at the end and the motor shaft 2. The contact pressure is determined by the spring force of the first bending brush arm 51 after bending, ensuring that the carbon brush 4 can still maintain a stable contact pressure on the motor shaft 2 even when the axial direction of the motor shaft 2 rotates is offset. At the same time, when the motor shaft 2 is subjected to large load operation in a short period of time, it is possible to prevent electro-corrosion, and by disassembling the fastening parts, the terminal 50 and the first brush arm along with the carbon brush 4 can be replaced quickly, thus achieving rapid maintenance.

[0048] Furthermore, the carbon brush 4 and the first bent brush arm 51 are fixedly connected by a snap-fit, which enables quick disassembly of the carbon brush 4 and the first bent brush arm 51. The first bent brush arm 51 and the terminal 50 are fixedly connected by riveting. When the motor shaft 2 is subjected to large load operation for anti-electrolytic corrosion in a short time, the connection between the first bent brush arm 51 and the terminal 50 is more stable and the connection structure is less likely to be damaged by the movement of the motor.

[0049] Furthermore, the resolver bracket 1 is located on one side of the motor resolver cover plate. If it is necessary to disassemble the entire anti-electro-corrosion component, there is no need to disassemble the motor, making it easier to check the status of use and achieve the purpose of quick maintenance.

[0050] The implementation principle of Embodiment 1 of this application is as follows: During the rotation of the motor shaft 2, the carbon brush 4 is driven by the first bent brush arm 51 directly connected to the resolver bracket 1 through the terminal 50, so that there is contact pressure between the carbon brush 4 and the motor shaft 2. The carbon powder will adhere to the contact position of the motor shaft 2, thereby achieving the effect of preventing corrosion of the motor shaft 2 even when the axial displacement occurs during the rotation of the motor shaft 2. When disassembly and maintenance are required, the terminal 50, the first bent brush arm 51 and the carbon brush 4 can be removed by disassembling the fastening parts at the terminal 50. This is suitable for situations where frequent disassembly of parts is required, such as the anti-electrolytic corrosion work of the motor shaft 2 under heavy load operation in a short period of time.

[0051] Example 2:

[0052] refer to Figures 4 to 6The difference between this embodiment and embodiment 1 lies in the connection method between the movable device 5 and the resolver bracket 1. In this embodiment, the resolver bracket 1 has several protrusions 10 integrally formed circumferentially on the side away from the resolver 3, and preferably two protrusions 10 are provided. The active device 5 includes a second bent brush arm 52. One end of the second bent brush arm 52 is integrally formed with a terminal 50. The terminal 50 is fixedly connected to one side of the boss 10 by fastening parts. The second bent brush arm 52 and the carbon brush 4 can be removed by disassembling the fastening parts. The end of the second bent brush arm 52 away from the terminal 50 is fixedly connected to the end of the carbon brush 4 away from the motor shaft 2. The length of the terminal 50, the second bent brush arm 52 and the carbon brush 4 protruding from the resolver bracket 1 does not exceed the length of the boss 10 protruding from the resolver bracket 1. Since the carbon brush 4 and the second bent brush arm 52 are both existing parts on the market, there is no need to design them separately and open molds. Therefore, the extra length of the boss 10 compared to the protrusion of the terminal 50, the second bent brush arm 52 and the carbon brush 4 can protect these easily worn parts, reduce the maintenance rate, and enable the motor shaft 2 to work for a long time under the condition of balanced load and anti-electrolytic corrosion.

[0053] Furthermore, the carbon brush 4 is fixedly connected to the second bent brush arm 52 by a snap fastener. Under long-term operation, since the carbon brush 4 is a consumable, when the carbon brush 4 wears out, there is no need to disassemble the second bent brush arm 52. The carbon brush 4 can be removed and replaced simply by removing the snap fastener. This is suitable for anti-electrolytic corrosion work of the motor shaft 2 under balanced load for a long period of time.

[0054] The implementation principle of Embodiment 2 of this application is as follows: When the motor shaft 2 rotates, the second bent brush arm 52 located on the boss 10 integrally formed with the resolver bracket 1 drives the carbon brush 4, causing the carbon brush 4 to generate contact pressure with the motor shaft 2. Carbon powder will adhere to the contact position of the motor shaft 2, thereby maintaining the anti-corrosion effect of the motor shaft 2 even when it rotates and its axial direction is offset. Since the protrusion of the boss 10 can protect the second bent brush arm 52 and carbon brush 4 and other parts from external wear, it is suitable for situations where less disassembly of parts is required, such as anti-electrolytic corrosion work of the motor shaft 2 under balanced load for a long period of time.

[0055] Example 3:

[0056] refer to Figures 7 to 9The difference between this embodiment and other embodiments lies in the connection method between the movable device 5 and the resolver bracket 1. In this embodiment, the resolver bracket 1 is circumferentially fixedly connected to several carbon brush holders 53 on the side away from the resolver 3 by fastening parts. Terminals 50 are integrally formed on both sides of the carbon brush holders 53. The terminals 50 are fixedly connected to the resolver bracket 1 by fastening parts. Preferably, there are two carbon brush holders 53, which are made of copper. Each carbon brush holder 53 has a first movable cavity radially opened along the motor shaft 2. The movable device 5 includes a spring 54, which is fixedly connected to the inner wall of the carbon brush holder 53 located in the first movable cavity away from the motor shaft 2. Preferably, the spring 54 is preferably an existing part, and no mold is required. The material is not limited, but it must be heat resistant to ≥180°C. After being stored at 180°C and cooled to room temperature, the spring force of the spring 54 changes by more than 2%, ensuring the elasticity stability of the carbon brush 4 during motor use. The end of the spring 54 near the motor shaft 2 is fixedly connected to the end of the carbon brush 4 away from the motor shaft 2. The carbon brush 4 is movably connected in the first movable cavity. The spring 54 always drives the carbon brush 4 to move towards the motor shaft 2. Therefore, the spring 54 applies contact pressure to the carbon brush 4 towards the motor shaft 2. The contact pressure is determined by the elastic force of the spring 54, which allows carbon powder to adhere to the contact position of the motor shaft 2, achieving the effects of lubrication and reducing wear. Furthermore, even when the axial direction of the motor shaft 2 is offset during rotation, the carbon brush 4 can still maintain its ability to prevent electro-corrosion of the motor shaft 2. The copper carbon brush holder 53 protects the carbon brush 4 and the spring 54, reducing external wear on the carbon brush 4 and the spring 54 and extending their service life. When parts need to be replaced, the carbon brush holder 53 and the connected spring 54 and carbon brush 4 can be quickly disassembled by removing the fastening parts. Therefore, it is suitable for situations where the motor shaft 2 operates under heavy loads in environments with high dust levels or other significant external influences, requiring anti-electro-corrosion measures.

[0057] The implementation principle of Embodiment 3 of this application is as follows: When the motor shaft 2 rotates, the spring 54 located in the carbon brush holder 53 drives the carbon brush 4 to apply contact pressure towards the motor shaft 2. The carbon powder fully adheres to the contact position of the motor shaft 2, so that when the motor shaft 2 rotates and its axial direction is offset, the carbon brush 4 still maintains the anti-corrosion effect of the motor shaft 2. When disassembly and maintenance are required, the spring 54 and the carbon brush 4 can be completely removed by disassembling the fastening parts at the terminal 50 of the carbon brush holder 53. This is suitable for situations where frequent disassembly of parts is required, such as anti-electrolytic corrosion work of the motor shaft 2 under heavy load in environments with a lot of dust and other external factors.

[0058] Example 4:

[0059] refer to Figures 10 to 12The difference between this embodiment and other embodiments lies in the connection method between the movable device 5 and the resolver bracket 1. In this embodiment, the resolver bracket 1 has several support blocks 11 integrally formed circumferentially on the side away from the resolver 3, and preferably two support blocks 11 are provided. A carbon brush cover 55 is fixedly connected to the side of the support block 11 away from the resolver bracket 1 by fastening parts. A second movable cavity is formed between the carbon brush cover 55 and the support block 11. The movable device 5 includes a spring 54, which is fixedly connected to the inner wall of the support block 11 located in the second movable cavity. The end of the spring 54 near the motor shaft 2 is fixedly connected to the end of the carbon brush 4 away from the motor shaft 2. The carbon brush 4 is movably connected in the second movable cavity. The spring 54 always drives the carbon brush 4 to move in the direction of the motor shaft 2, so that the carbon brush 4 applies contact pressure in the direction of the motor shaft 2 to perform anti-electrolytic corrosion work. When the axial displacement of the motor shaft 2 is caused, the situation of the carbon brush 4's anti-electrolytic corrosion ability to the motor shaft 2 can be avoided as much as possible. The carbon brush cover 55 is made of copper, which can protect the carbon brush 4 and reduce external wear on the carbon brush 4.

[0060] Furthermore, the spring 54 is fixed to the resolver bracket 1 by the support block 11, and is separated from the carbon brush cover 55 that needs to be removed, so as to avoid the problem of unstable connection of the spring 54 due to the loosening of fastening parts. Therefore, it is suitable for the anti-electrolytic corrosion work of motor shaft 2 in environments with a lot of dust and other external factors that have a large impact on balanced load operation.

[0061] Preferably, the spring 54 is selected from existing parts and does not require mold opening. The material is not limited, but it must be resistant to high temperature ≥180℃. After being stored at 180℃ and cooled to room temperature, the spring force of the spring 54 changes by more than 2%, ensuring the elasticity stability of the carbon brush 4 during motor use.

[0062] The implementation principle of Embodiment 4 of this application is as follows: During the rotation of the motor shaft 2, the spring 54 located in the second movable cavity of the support block 11 drives the carbon brush 4 to apply contact pressure to the motor shaft 2. Therefore, the carbon powder can fully adhere to the contact position of the motor shaft 2, so that when the motor shaft 2 rotates and its axial displacement occurs, the carbon brush 4 can still maintain the anti-corrosion effect of the motor shaft 2. When disassembly and maintenance are required, the carbon brush cover 55 can be removed by disassembling the fastening parts at the terminal 50 of the carbon brush cover 55. No operation of the spring 54 is required. This is suitable for the anti-electrochemical corrosion work of the motor shaft 2 under balanced load operation in environments with a lot of dust and other external factors.

[0063] Example 5:

[0064] refer to Figures 13 to 15The resolver bracket 1 has a cavity at one end facing the resolver 3. A grounding ring 6 is fixedly connected to the resolver bracket 1 within the cavity. The movable device 5 includes a carbon fiber bundle. The grounding ring 6 wraps around the motor shaft 2 through the carbon fiber bundle to form a flexible conductive channel. The contact pressure is determined by the rebound force of the carbon fiber bundle of the grounding ring 6, which adapts in real time to the deformation of the motor shaft 2 under different speeds and loads, ensuring stable output of shaft current and effectively suppressing the electro-corrosion phenomenon caused by the accumulation of current on the motor shaft 2.

[0065] The implementation principle of Embodiment 5 of this application is as follows: after the carbon fiber bundle of the grounding ring 6 contacts the outer circular surface of the motor shaft 2, it bends. The bending and rebound of the carbon fiber bundle ensures effective contact with the outer circular surface of the motor shaft 2, and a low impedance circuit is formed through the grounding ring 6 built into the cavity.

[0066] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An electric machine shaft rotary variable branch support assembly, characterized by, The application relates to a resolver support (1) which is penetrated by a motor shaft (2) of a motor, and which is provided with a resolver (3) on the side of the motor base, the rotor of the resolver (3) is coaxially connected with the motor shaft (2), and the resolver support (1) is provided with a carbon brush (4) on the side away from the resolver (3), one end of the carbon brush (4) abuts against the outer side of the motor shaft (2), and the carbon brush (4) is provided with a moving device (5) for changing the pressure applied by the carbon brush (4) to the motor shaft (2).

2. The motor shaft rotary variable branch support assembly of claim 1, wherein, The resolver support (1) is provided with a plurality of terminals (50) on the side away from the resolver (3) through fastening parts, the moving device (5) comprises a first bent brush arm (51), the first bent brush arm (51) is arranged at the end of the carbon brush (4) away from the motor shaft (2), and one end of the first bent brush arm (51) away from the carbon brush (4) is fixedly connected with one terminal (50).

3. The motor shaft rotary variable bearing support assembly of claim 1, wherein, The resolver support (1) is integrally provided with a plurality of bosses (10) on the side away from the resolver (3), the moving device (5) comprises a second bent brush arm (52), one end of the second bent brush arm (52) is provided with a terminal (50), the terminal (50) is arranged on one side of the boss (10) through fastening parts, one end of the second bent brush arm (52) away from the terminal (50) is fixedly connected with the end of the carbon brush (4) away from the motor shaft (2), and the length of the terminal (50), the second bent brush arm (52) and the carbon brush (4) protruding from the resolver support (1) does not exceed the length of the boss (10) protruding from the resolver support (1).

4. The motor shaft rotary variable branch support assembly of claim 1, wherein, The resolver support (1) is provided with a plurality of carbon brush seats (53) on the side away from the resolver (3) through fastening parts, each carbon brush seat (53) is provided with a first moving cavity along the radial direction of the motor shaft (2), the moving device (5) comprises a spring (54), the spring (54) is arranged on the inner wall of the carbon brush seat (53) away from the first moving cavity and the motor shaft (2), one end of the spring (54) close to the motor shaft (2) is fixedly connected with the end of the carbon brush (4) away from the motor shaft (2), the carbon brush (4) is movably connected in the first moving cavity, and the spring (54) always drives the carbon brush (4) to move towards the motor shaft (2).

5. The motor shaft rotary variable bearing support assembly of claim 1, wherein, The resolver support (1) is integrally provided with a plurality of support blocks (11) on the side away from the resolver (3), the support block (11) is provided with a carbon brush cover (55) on the side away from the resolver support (1) through fastening parts, a second moving cavity is formed between the carbon brush cover (55) and the support block (11), the moving device (5) comprises a spring (54), the spring (54) is arranged on the inner wall of the support block (11) located in the second moving cavity, one end of the spring (54) close to the motor shaft (2) is fixedly connected with the end of the carbon brush (4) away from the motor shaft (2), the carbon brush (4) is movably connected in the second moving cavity, and the spring (54) always drives the carbon brush (4) to move towards the motor shaft (2).

6. The motor shaft rotary variable bearing support assembly of claim 1, wherein, The rotating transformer support (1) is provided with a cavity at one end facing the rotating transformer (3), the rotating transformer support (1) is provided with a grounding ring (6) in the cavity, the movable device (5) comprises a carbon fiber bundle, and the grounding ring (6) wraps the motor shaft (2) through the carbon fiber bundle.

7. The motor shaft rotary variable bearing support assembly of claim 2, wherein, The carbon brush (4) is fixedly connected with the first bent brush arm (51) through buckling, and the first bent brush arm (51) is fixedly connected with the terminal (50) through riveting.

8. The motor shaft rotary variable bearing support assembly of claim 3, wherein, The carbon brush (4) is fixedly connected with the second bent brush arm (52) through buckling.

9. The motor shaft rotary variable bearing support assembly of claim 1, wherein, The rotating transformer support (1) is arranged on one side of a motor rotating transformer cover plate.

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