Electric power steering motor, electric power steering system and vehicle

Abstract

The utility model provides an electric power steering motor, an electric power steering system and a vehicle. The electric power steering motor comprises a rotor iron core, the rotor iron core comprises a plurality of iron core sections, the plurality of iron core sections are stacked, any two adjacent iron core sections are staggered in the clockwise direction or the anticlockwise direction, the rotor iron core is provided with a shaft hole, and the shaft hole penetrates through the plurality of iron core sections in the axial direction of the rotor iron core; the plurality of positioning pieces are arranged on the peripheral side of the rotor iron core, and the plurality of positioning pieces are arranged at intervals along the circumferential direction of the rotor iron core; the positioning ring is arranged on the outer sides of the multiple positioning pieces in a sleeving mode, and an installation cavity is defined by every two adjacent positioning pieces, the rotor iron core and the positioning ring; a plurality of permanent magnets, wherein each permanent magnet is arranged in one mounting cavity; the rotating shaft penetrates through the shaft hole; the rotor core is located between the first bearing and the second bearing, and at least one of the first bearing and the second bearing is a four-point contact ball bearing. According to the arrangement, the vibration noise of the electric power steering motor can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and more particularly, to an electric power steering motor, an electric power steering system, and a vehicle. Background Art

[0002] With the progress of technology, new energy vehicles are being accepted and pursued by more and more families. In related technologies, the vibration and noise of the motors of new energy vehicles are relatively large, which reduces the performance of the products and affects the driving experience of drivers. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, a first aspect of the present application provides an electric power steering motor.

[0005] A second aspect of the present application provides an electric power steering system.

[0006] A third aspect of the present application provides a vehicle.

[0007] In view of this, the present application provides an electric power steering motor, including: a rotor core, the rotor core including a plurality of core segments, the plurality of core segments being stacked, any two adjacent core segments being arranged offset in the clockwise direction or the counterclockwise direction, the rotor core being provided with a shaft hole, the shaft hole extending axially through the plurality of core segments along the rotor core; a plurality of positioning members, provided on the outer peripheral side of the rotor core, and the plurality of positioning members being spaced apart circumferentially along the rotor core; a positioning ring, sleeved outside the plurality of positioning members, an installation cavity being defined by two adjacent positioning members, the rotor core, and the positioning ring; a plurality of permanent magnets, each permanent magnet being disposed in one installation cavity; a rotating shaft, passing through the shaft hole; a first bearing; and a second bearing, both the first bearing and the second bearing being sleeved on the rotating shaft, the rotor core being located between the first bearing and the second bearing, and at least one of the first bearing and the second bearing being a four-point contact ball bearing.

[0008] An electric power steering motor provided by the present application includes a rotor core, a plurality of positioning members, a positioning ring, a plurality of permanent magnets, a rotating shaft, a first bearing, and a second bearing.

[0009] The rotor core includes a plurality of core segments stacked axially along the rotor core. Among them, any two adjacent core segments are arranged offset in the clockwise direction, or any two adjacent core segments are arranged offset in the counterclockwise direction. That is, any two adjacent core segments are arranged offset in the circumferential direction of the rotor core to form a rotor skew pole. The segmented modular setting of the rotor core has the advantages of being convenient for installation and maintenance, and skew poles can be formed between the plurality of core segments.

[0010] It is defined that any two adjacent iron core segments are arranged staggeredly in the clockwise or counterclockwise direction, which can reduce the cogging torque and torque ripple, thereby reducing the electromagnetic vibration. That is to say, by dividing the rotor iron core into multiple iron core segments and arranging any two adjacent iron core segments staggeredly in the clockwise or counterclockwise direction, the specific harmonic content in the electric power steering motor can be effectively suppressed, the torque ripple and cogging torque of the electric power steering motor can be improved, so as to achieve the effect of reducing the vibration and noise of the electric power steering motor.

[0011] Furthermore, the rotor iron core is provided with a shaft hole, the shaft hole axially penetrates through multiple iron core segments along the rotor iron core, a rotating shaft is inserted into the shaft hole, a first bearing is sleeved on the rotating shaft, a second bearing is sleeved on the rotating shaft, the first bearing is located outside the rotor iron core, and the second bearing is located outside the rotor iron core. Among them, at least one of the first bearing and the second bearing is a four-point contact ball bearing. That is, the first bearing is a four-point contact ball bearing, and / or the second bearing is a four-point contact ball bearing.

[0012] The four-point contact ball bearing can enhance the overall anti-deformation ability of the electric power steering motor, is beneficial to improving the structural stiffness of the electric power steering motor, and can reduce the axial runout amount when the electric power steering motor works. In this way, the vibration performance of the electric power steering motor during operation is further improved, the vibration and noise of the electric power steering motor can be further reduced, and the service performance and market competitiveness of the electric power steering motor are greatly improved.

[0013] Furthermore, any one of the multiple positioning parts is arranged on the outer peripheral side of the rotor iron core. Adjacent two positioning parts, the rotor iron core and the positioning ring enclose an installation cavity. That is to say, the multiple positioning parts, the rotor iron core and the positioning ring enclose multiple installation cavities. Each installation cavity is provided with a permanent magnet. The shape of the permanent magnet matches the shape of the installation cavity.

[0014] The positioning ring, the multiple positioning parts and the rotor iron core cooperate to fasten and limit the multiple permanent magnets in the circumferential and radial directions of the rotor iron core, so that the permanent magnets are stably assembled on the rotor iron core. In this way, the situation of loosening of the multiple permanent magnets caused by assembly errors can be avoided, the assembly dimensions of the permanent magnets and the rotor iron core can be ensured, the reliability of the motor can be effectively increased, and the noise of the motor can be suppressed.

[0015] Optionally, when the first bearing and the second bearing are both four-point contact ball bearings, that is, four-point contact ball bearings are arranged on both axial sides of the rotor core, this increases the fitting area and fitting angle of the first bearing, the second bearing and the rotating shaft, can further enhance the overall anti-deformation ability of the rotor, can further improve the structural stiffness of the electric power steering motor, can reduce the axial movement of the electric power steering motor when it is working, so that the vibration performance of the electric power steering motor during operation is further improved, and the vibration noise of the electric power steering motor can be further reduced.

[0016] The motor described above in this application may also have the following additional technical features:

[0017] In some embodiments, optionally, the electric power steering motor further includes: a shell, a first bearing cavity and a second bearing cavity are provided in the shell, a rotor core, a plurality of positioning members, a positioning ring, a plurality of permanent magnets, a rotating shaft, a first bearing and a second bearing are all provided in the shell, the first bearing is located in the first bearing cavity, and the second bearing is located in the second bearing cavity; a first elastic part is provided in the first bearing cavity, the first elastic part abuts between a side of the first bearing away from the rotor core and a cavity wall of the first bearing cavity, and the first elastic part is used to apply an axial preload to the first bearing; wherein the first bearing is interference fit with the rotating shaft.

[0018] In this embodiment, the electric power steering motor further includes a housing and a first elastic portion.

[0019] The rotor core, multiple positioning members, positioning rings, multiple permanent magnets, a rotating shaft, a first bearing, and a second bearing are all arranged in the housing. That is, the housing serves as a mounting carrier for the rotor core, multiple positioning members, positioning rings, multiple permanent magnets, a rotating shaft, a first bearing, and a second bearing, and has the function of mounting and fixing the rotor core, multiple positioning members, positioning rings, multiple permanent magnets, a rotating shaft, a first bearing, and a second bearing, so as to ensure the matching dimensions of the rotor core, multiple positioning members, positioning rings, multiple permanent magnets, a rotating shaft, a first bearing, and a second bearing.

[0020] A first bearing cavity and a second bearing cavity are provided in the housing. The first bearing cavity is used for installing a first bearing, and the second bearing cavity is used for installing a second bearing.

[0021] The first bearing is interference fit with the rotating shaft, the first elastic part is arranged in the first bearing cavity, the first bearing is located between the first elastic part and the rotor core, the first elastic part abuts against the first bearing, and the first elastic part abuts against the cavity wall of the first bearing cavity. In other words, the first elastic part abuts between the side of the first bearing away from the rotor core and the cavity wall of the first bearing cavity. The first elastic part is used to apply an axial preload force to the first bearing so that the first bearing is firmly assembled on the rotating shaft.

[0022] It can be understood that after the motor is assembled, the first elastic part is located between the first bearing and the wall of the first bearing cavity. By squeezing the first elastic part, an axial preloading force is applied to the first bearing to ensure the structural stiffness of the electric power steering motor, which is beneficial to reducing the axial movement amount during the operation of the electric power steering motor.

[0023] It can be understood that the wall of the first bearing cavity functions to limit the first bearing. Specifically, the wall of the first bearing cavity is used to radially limit the first bearing on the rotating shaft.

[0024] In addition, the first bearing and the rotating shaft are in interference fit to axially and radially limit the first bearing on the rotating shaft.

[0025] Optionally, the first elastic part includes a wave washer, a spring, a torsion spring, a tension spring, etc., which are not listed one by one here.

[0026] In some embodiments, optionally, a first convex part is provided in the second bearing cavity, and the first convex part abuts against the outer peripheral wall of the second bearing. The second bearing and the rotating shaft are in interference fit; when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing.

[0027] In this embodiment, the matching structure between the housing and the second bearing is further defined.

[0028] Specifically, a first convex part is provided in the second bearing cavity, and the first convex part abuts against the outer peripheral wall of the second bearing. Specifically, the first convex part is riveted on the outside of the second bearing, and the second bearing and the rotating shaft are in interference fit. The first convex part and the rotating shaft cooperate to axially, radially and circumferentially limit the second bearing. To improve the structural stiffness of the electric power steering motor, the axial movement amount during the operation of the electric power steering motor can be reduced, and the overall anti-deformation ability of the electric power steering motor can be enhanced. In this way, the vibration performance during the operation of the electric power steering motor is further improved, the vibration noise of the electric power steering motor can be further reduced, and the service performance and market competitiveness of the electric power steering motor are greatly improved.

[0029] Optionally, when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing and the first bearing is a non-four-point contact ball bearing.

[0030] Optionally, both the first bearing and the second bearing are four-point contact ball bearings, that is, the first bearing is a four-point contact ball bearing and the second bearing is a four-point contact ball bearing.

[0031] In some embodiments, optionally, the end face of the second bearing facing the rotor core is connected to the outer peripheral wall of the rotating shaft through a welding fixing part, and the second bearing and the rotating shaft are in clearance fit; when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing.

[0032] In this embodiment, the mating structure of the rotating shaft and the second bearing is further defined.

[0033] Specifically, the second bearing is in clearance fit with the rotating shaft, and the end face of the second bearing facing the rotor core is connected to the outer peripheral wall of the rotating shaft through a welding fixing portion. That is, the welding fixing portion stably assembles the second bearing and the rotating shaft together.

[0034] The welding fixing portion and the rotating shaft cooperate to limit the second bearing axially, radially, and circumferentially along the rotating shaft. To improve the structural stiffness of the electric power steering motor, the axial end play during the operation of the electric power steering motor can be reduced, and the overall anti-deformation ability of the electric power steering motor can be enhanced. In this way, the vibration performance during the operation of the electric power steering motor is further improved, the vibration noise of the electric power steering motor can be further reduced, and the service performance and market competitiveness of the electric power steering motor are greatly improved.

[0035] In addition, the second bearing is a four-point contact ball bearing, and the second bearing and the rotating shaft are stably assembled through the welding fixing portion. This setting can reduce the influence on the radial clearance of the second bearing and ensure the radial clearance of the second bearing. In this way, it is beneficial to reduce the frictional torque during the operation of the electric power steering motor. That is to say, this setting takes into account reducing the vibration noise of the electric power steering motor and reducing the frictional torque of the electric power steering motor, and improves the service performance and market competitiveness of the product.

[0036] Optionally, when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing, and the first bearing is a non-four-point contact ball bearing.

[0037] Optionally, both the first bearing and the second bearing are four-point contact ball bearings, that is, the first bearing is a four-point contact ball bearing and the second bearing is a four-point contact ball bearing.

[0038] It can be understood that when there is no load, the inner ring of the second bearing is fixed, and the displacement of the outer ring of the second bearing relative to the fixed inner ring from one extreme position to another extreme position along the radial direction of the rotor core is denoted as the radial clearance of the second bearing.

[0039] In some embodiments, optionally, the welding fixing portion is arranged around the rotating shaft; or the number of the welding fixing portions is multiple, and the multiple welding fixing portions are arranged at intervals along the circumferential direction of the rotating shaft.

[0040] In this embodiment, the setting position of the welding fixing portion is further defined.

[0041] Optionally, the welding fixing portion is disposed around the rotating shaft, that is, the welding fixing portion is an annular structure, and along the circumferential direction of the rotating shaft, the welding fixing portion is welded around the connection between the rotating shaft and the second bearing. That is, full circumferential welding of the rotating shaft and the second bearing is achieved. This setting can increase the mating area and mating angle between the welding fixing portion and the rotating shaft and the second bearing, which is beneficial to improving the stability and reliability of the assembly of the rotating shaft and the second bearing, enhancing the overall anti-deformation ability of the electric power steering motor, and reducing the frictional torque of the electric power steering motor.

[0042] Optionally, the number of the welding fixing portions is multiple, and the multiple welding fixing portions are arranged at intervals along the circumferential direction of the rotating shaft. This setting can effectively fix the rotating shaft and the second bearing from multiple directions and angles, ensure the balance and consistency of the forces at different positions of the second bearing, ensure the radial clearance of the second bearing, enhance the overall anti-deformation ability of the electric power steering motor, and reduce the frictional torque of the electric power steering motor. Moreover, this setting is beneficial to reducing the deformation amount at the connection between the rotating shaft and the second bearing, reducing the difficulty of the process of connecting the rotating shaft and the second bearing, and improving the assembly efficiency of the motor.

[0043] In some embodiments, optionally, a first card slot is further provided in the housing, the first card slot is located on the side of the second bearing cavity facing the first bearing cavity, and the first card slot communicates with the second bearing cavity; the electric power steering motor further includes a second elastic portion, the second elastic portion is disposed in the first card slot, the second elastic portion is disposed around the rotating shaft, and the second elastic portion abuts against the second bearing, and the second elastic portion is used to limit the axial displacement of the second bearing.

[0044] In this embodiment, the mating structure between the housing and the second bearing is further defined.

[0045] A first card slot is further provided in the housing, the first card slot is located on the side of the second bearing cavity facing the first bearing cavity, and the first card slot communicates with the second bearing cavity.

[0046] The electric power steering motor further includes a second elastic portion, and the first card slot is used for installing and fixing the second elastic portion. The second elastic portion is disposed in the first card slot, the second elastic portion is disposed around the rotating shaft, and the second elastic portion abuts against the second bearing, and the second elastic portion is used to axially limit the second bearing along the rotating shaft to ensure the mating dimensions between the second bearing and the rotating shaft, which is beneficial to improving the stability and reliability of the assembly of the rotating shaft and the second bearing, enhancing the overall anti-deformation ability of the electric power steering motor, and reducing the frictional torque of the electric power steering motor.

[0047] The welding fixing part and the second elastic part cooperate to ensure the radial clearance of the second bearing while reducing the vibration and noise of the electric power steering motor, enhance the anti-deformation ability of the electric power steering motor, and reduce the friction torque of the electric power steering motor. That is to say, this setting takes into account reducing the vibration and noise of the electric power steering motor and reducing the friction torque of the electric power steering motor, improving the performance and market competitiveness of the product.

[0048] In some embodiments, optionally, along the axial direction of the rotating shaft, the width of the first card slot is smaller than the width of the second elastic part.

[0049] In this embodiment, the matching structure of the first card slot and the second elastic part is further defined.

[0050] Specifically, along the axial direction of the rotating shaft, the width of the first card slot is smaller than the width of the second elastic part. The second elastic part is in interference fit with the first card slot, and the second elastic part is extruded, and the second elastic part is tightened and deformed by itself to effectively limit the displacement of the second bearing in the axial direction of the rotating shaft.

[0051] In some embodiments, optionally, a second convex part is provided in the second bearing cavity, and the second convex part abuts against the outer peripheral wall of the second bearing.

[0052] In this embodiment, the matching structure of the second bearing cavity and the second bearing is further defined.

[0053] Specifically, the end face of the second bearing facing the rotor core is connected to the outer peripheral wall of the rotating shaft through a welding fixing part, the second bearing is in clearance fit with the rotating shaft, a second convex part is provided in the second bearing cavity, and the second convex part abuts against the outer peripheral wall of the second bearing.

[0054] When one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing.

[0055] The second convex part abuts against the outer peripheral wall of the second bearing. Specifically, the second convex part is riveted on the outside of the second bearing, and the second convex part and the welding fixing part cooperate to limit the second bearing axially, radially and circumferentially. To improve the structural stiffness of the electric power steering motor, reduce the axial end play when the electric power steering motor works, and enhance the overall anti-deformation ability of the electric power steering motor. In this way, the vibration performance of the electric power steering motor during operation is further improved, the vibration and noise of the electric power steering motor can be further reduced, and the performance and market competitiveness of the electric power steering motor are greatly improved.

[0056] In some embodiments, optionally, the second bearing is in interference fit with the rotating shaft; a second card slot is further provided in the housing, the second card slot is located on the side of the second bearing cavity facing the first bearing cavity, and the second card slot communicates with the second bearing cavity; the electric power steering motor further includes a third elastic part, the third elastic part is arranged in the second card slot, the third elastic part surrounds the rotating shaft, and the third elastic part abuts against the second bearing, and the third elastic part is used to limit the axial displacement of the second bearing; when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing.

[0057] In this embodiment, the mating structure of the rotating shaft and the second bearing is further defined.

[0058] A second card slot is further provided in the housing, the second card slot is located on the side of the second bearing cavity facing the first bearing cavity, and the second card slot communicates with the second bearing cavity.

[0059] The electric power steering motor further includes a third elastic part, and the second card slot is used for installing and fixing the third elastic part. The third elastic part is arranged in the second card slot, the third elastic part surrounds the rotating shaft, and the third elastic part abuts against the second bearing. The third elastic part is used to axially limit the second bearing along the rotating shaft to ensure the mating dimensions of the second bearing and the rotating shaft. It is beneficial to improve the stability and reliability of the assembly of the rotating shaft and the second bearing, so as to enhance the overall anti-deformation ability of the electric power steering motor and reduce the frictional torque of the electric power steering motor.

[0060] The second bearing is in interference fit with the rotating shaft. The rotating shaft and the third elastic part cooperate to stably assemble the second bearing and the rotating shaft together.

[0061] The rotating shaft and the third elastic part cooperate to axially, radially and circumferentially limit the second bearing. To improve the structural stiffness of the electric power steering motor, reduce the axial runout amount during the operation of the electric power steering motor, and enhance the overall anti-deformation ability of the electric power steering motor. In this way, the vibration performance of the electric power steering motor during operation is further improved, the vibration noise of the electric power steering motor can be further reduced, and the service performance and market competitiveness of the electric power steering motor are greatly improved.

[0062] In addition, the second bearing is a four-point contact ball bearing, and the second bearing is in interference fit with the rotating shaft, and the third elastic part is used to limit the axial displacement of the second bearing. This setting can reduce the influence on the radial clearance of the second bearing and ensure the radial clearance of the second bearing. In this way, it is beneficial to reduce the frictional torque during the operation of the electric power steering motor. That is to say, this setting takes into account reducing the vibration noise of the electric power steering motor and reducing the frictional torque of the electric power steering motor, and improves the service performance and market competitiveness of the product.

[0063] Optionally, the third elastic part includes a spring, a torsion spring, a tension spring, etc., which are not listed one by one here.

[0064] Optionally, when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing and the first bearing is a non-four-point contact ball bearing.

[0065] Optionally, both the first bearing and the second bearing are four-point contact ball bearings, that is, the first bearing is a four-point contact ball bearing and the second bearing is a four-point contact ball bearing.

[0066] It can be understood that when there is no load, the inner ring of the second bearing is fixed, and the displacement of the outer ring of the second bearing relative to the fixed inner ring from one extreme position to another extreme position along the radial direction of the rotor core is denoted as the radial clearance of the second bearing.

[0067] In some embodiments, optionally, along the axial direction of the rotating shaft, the width of the second card slot is smaller than the width of the third elastic part.

[0068] In this embodiment, the mating structure of the second card slot and the third elastic part is further defined.

[0069] Specifically, along the axial direction of the rotating shaft, the width of the second card slot is smaller than the width of the third elastic part. The third elastic part is in interference fit with the second card slot, and the third elastic part is extruded, and the tightening deformation of the third elastic part itself is used to effectively limit the displacement of the second bearing in the axial direction of the rotating shaft.

[0070] In some embodiments, optionally, a chamfer is provided on the side of the third elastic part facing away from the second bearing, a mating inclined surface is provided on the part of the second card slot opposite to the chamfer, and the chamfer is in contact with the mating inclined surface.

[0071] In this embodiment, the mating structure of the third elastic part and the second card slot is further defined.

[0072] Specifically, a chamfer is provided on the side of the third elastic part facing away from the second bearing, a mating inclined surface is provided on the part of the second card slot opposite to the chamfer, and the chamfer is in contact with the mating inclined surface.

[0073] When the third elastic part is assembled into the second card slot, the chamfer is matched with the mating inclined surface to play a guiding role, so that the third elastic part can be smoothly assembled into the second card slot with interference, which not only meets the use requirements of the interference fit between the third elastic part and the second card slot, but also reduces the assembly difficulty of assembling the third elastic part.

[0074] In some embodiments, optionally, at least a part of the hole wall of the shaft hole is in interference fit with the rotating shaft.

[0075] In this embodiment, the mating structure of the rotor core and the rotating shaft is defined.

[0076] At least a part of the hole wall of the shaft hole is in interference fit with the rotating shaft. That is, a part of the hole wall of the shaft hole is in interference fit with the rotating shaft. Or the entire hole wall of the shaft hole is in interference fit with the rotating shaft.

[0077] This setting can ensure the mating structure between the rotating shaft and the rotor core, and avoid the separation of the rotating shaft and the rotor core.

[0078] When a part of the hole wall of the shaft hole is in interference fit with the rotating shaft, the contact area between the shaft hole and the rotating shaft can be reduced. That is, while ensuring the use requirement of the interference fit between the rotating shaft and the shaft hole, the radial force formed by the interference fit between the shaft hole and the rotating shaft can also be reduced due to the reduction of the contact area between the shaft hole and the rotating shaft. This can reduce the influence of the radial force on the bonding force between the laminations of the rotor core, which is beneficial to reducing the probability of deformation of the laminations of the rotor core, and can further reduce the probability of loosening of multiple laminations of the rotor core.

[0079] Optionally, the hole wall of the shaft hole is a concave-convex wall. The protrusions of the concave-convex wall are in interference fit with the rotating shaft, and the depressions of the concave-convex wall are arranged separately from the rotating shaft. The protrusions and depressions of the concave-convex wall are arranged alternately, and both the protrusions and the depressions extend along the axial direction of the rotating shaft.

[0080] In some embodiments, optionally, at least a part of the outer radial surfaces of the plurality of positioning members are provided with first grooves, the positioning ring is provided with a plurality of third protrusions, and each third protrusion is embedded in a first groove; a part of the permanent magnet protrudes from the outer radial surface of the positioning member and is arranged in contact with the inner peripheral wall of the positioning ring.

[0081] In this embodiment, the mating structure of the permanent magnet, the positioning member and the positioning ring is further defined.

[0082] Specifically, at least a part of the outer radial surfaces of the plurality of positioning members are provided with first grooves, that is, the outer radial surface of each positioning member is provided with a first groove. Or the outer radial surfaces of a part of the positioning members are provided with first grooves.

[0083] After assembling the plurality of positioning members and the plurality of permanent magnets on the outer peripheral side of the rotor core, the base material of the positioning ring is sleeved on the outside of the plurality of positioning members, and the base material of the positioning ring is pressed along the direction from the outer peripheral wall to the inner peripheral wall of the base material of the positioning ring by a press, so that a part of the base material of the positioning ring is pressed into the first groove to form a third protrusion. It can be understood that the part of the base material of the positioning ring located in the first groove is the third protrusion, and the third protrusion and the first groove are embedded and mated. During the pressing process, the part of the positioning ring between two adjacent first grooves will shrink, so that the positioning ring is pressed tightly outside the plurality of permanent magnets, so that a part of the permanent magnet protrudes from the outer radial surface of the positioning member and is arranged in contact with the inner peripheral wall of the positioning ring.

[0084] The positioning ring, multiple positioning members and the rotor core cooperate to fasten and limit multiple permanent magnets in the circumferential and radial directions of the rotating shaft, so that the permanent magnets are stably assembled on the rotor core. In this way, the situation of multiple permanent magnets loosening due to assembly errors can be avoided, the assembly dimensions of the permanent magnets and the rotor core can be guaranteed, the reliability of the motor can be effectively increased, and the noise of the motor can be suppressed.

[0085] In addition, the third convex portion of the positioning ring is embedded in the first groove of the positioning member, and the cooperation between the third convex portion and the first groove can prevent the positioning ring from moving in the circumferential direction of the rotating shaft. In this way, the noise of the electric power steering motor can be further suppressed. The use performance and market competitiveness of the product are further improved.

[0086] In some embodiments, optionally, the number of the third convex portions is less than or equal to the number of the first grooves.

[0087] In this embodiment, the cooperation structure between the third convex portion and the first groove is further defined.

[0088] Specifically, the number of the third convex portions is less than or equal to the number of the first grooves.

[0089] When the first groove is provided on the radially outer surface of each positioning member and the number of the third convex portions is less than the number of the first grooves, since each positioning member is provided with the first groove, in this way, the assembly difficulty of the rotor core and the multiple positioning members will be simplified, and there is no need to calibrate the assembly position of the positioning member provided with the first groove. This setting is beneficial to reducing the assembly difficulty of the electric power steering motor, improving the assembly efficiency of the electric power steering motor and reducing the production cost of the product while ensuring the assembly dimensions of the multiple permanent magnets and the rotor core. Among them, the positioning ring is provided with a plurality of third convex portions, the number of the third convex portions is less than or equal to the number of the first grooves, and each third convex portion is embedded in a first groove. When the number of the third convex portions is less than the number of the first grooves, a part of the first grooves among the multiple first grooves are provided with the third convex portions, and the other part of the first grooves among the multiple first grooves are not provided with the third convex portions, that is to say, not every first groove is provided with the third convex portion.

[0090] In some embodiments, optionally, the number of the third convex portions is denoted as M, 2 ≤ M ≤ 10, and M is an even number.

[0091] In this embodiment, the number of the third convex portions is further defined, so that the number of the third convex portions is denoted as M, 2 ≤ M ≤ 10, and M is an even number. For example, the number of the third convex portions includes 4, 6, and 8.

[0092] This setting can ensure the mating area and mating angle between the positioning ring and the multiple positioning members. The positioning ring can extrude the multiple positioning members from multiple directions and angles, ensuring the balance and consistency of the forces on the multiple permanent magnets. It provides a reliable structural support for ensuring the mating dimensions between the multiple permanent magnets and the rotor core.

[0093] Moreover, this setting also takes into account the processing difficulty of the multiple positioning members, simplifies the processing procedures of the multiple positioning members, and is conducive to reducing the production cost of the multiple positioning members.

[0094] In some embodiments, optionally, the radially outer surface of the positioning member is spaced from the inner peripheral wall of the positioning ring.

[0095] In this embodiment, the mating structure between the positioning member and the positioning ring is further defined.

[0096] Specifically, the radially outer surface of the positioning member is spaced from the inner peripheral wall of the positioning ring. That is, along the radial direction of the rotating shaft, there is a gap between the positioning member and the inner peripheral wall of the positioning ring, and the radially outer surface of the positioning member and the inner peripheral wall of the positioning ring are not in contact.

[0097] This setting can not only ensure the effectiveness of fixing the permanent magnet between the positioning member and the rotor core by the multiple positioning members, but also reduce the processing accuracy requirements for the multiple positioning members and the multiple permanent magnets, and ensure the reliability of rotor assembly. If the radially outer surface of the positioning member is in contact with the inner peripheral wall of the positioning ring, the processing accuracy requirements for the positioning member are relatively high. Because if the distance from the radially outer surface of the positioning member to the rotor core is greater than the distance from the radially outer surface of the permanent magnet to the rotor core, the inner peripheral wall of the positioning ring cannot effectively contact the outer peripheral wall of the permanent magnet, and thus the purpose of pressing the multiple permanent magnets cannot be achieved, and the situation of permanent magnet loosening will occur.

[0098] It can be understood that the radially outer surface of the positioning member is spaced from the inner peripheral wall of the positioning ring, that is, the distance from the radially outer surface of the positioning member to the rotor core is less than the distance from the inner peripheral wall of the positioning ring to the rotor core.

[0099] In some embodiments, optionally, the positioning ring is a non-magnetic metal sleeve.

[0100] In this embodiment, the structure of the positioning ring is further defined such that the positioning ring is a non-magnetic metal sleeve. The positioning ring is made of a metal material that will not cause obvious magnetization under the action of a magnetic field. The magnetic permeability of the positioning ring is low and will not affect the operating parameters of the electric power steering motor.

[0101] Optionally, the positioning ring includes a stainless steel sleeve, an aluminum alloy sleeve, and a titanium alloy sleeve.

[0102] In some embodiments, optionally, the thickness of the positioning ring is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0103] In this embodiment, the structure of the positioning ring is further defined such that the thickness of the positioning ring is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. This setting can ensure the effectiveness and feasibility of the positioning ring in fixing multiple permanent magnets and the rotor core, and at the same time, can ensure the overall dimensions of the motor.

[0104] Optionally, the thickness of the positioning ring includes 0.2 mm, 0.3 mm, 0.4 mm, etc., which are not listed one by one here.

[0105] In some embodiments, optionally, the positioning member includes: a connecting section, the connecting section has a first wall surface and a second wall surface arranged oppositely in the radial direction of the rotating shaft, the first wall surface is located between the rotor core and the second wall surface, and the first wall surface is arranged in contact with the radial outer surfaces of two adjacent permanent magnets; a connecting section, the connecting section extends from the connecting section towards the rotor core, the connecting section is clamped between two adjacent permanent magnets, the rotor core is provided with a second groove, and the end of the connecting section is inserted into the second groove.

[0106] In this embodiment, the structure of the positioning member is further defined.

[0107] The positioning member includes a connecting section and a connecting section. The connecting section extends from the connecting section towards the rotor core. And the end of the connecting section facing away from the connecting section is inserted into the second groove of the rotor core.

[0108] Along the radial direction of the rotating shaft, the positioning member includes a first wall surface and a second wall surface, and the first wall surface and the second wall surface are arranged oppositely. The first wall surface is located between the rotor core and the second wall surface.

[0109] The first wall surface is arranged in contact with the radial outer surfaces of two adjacent permanent magnets, the connecting section is clamped between two adjacent permanent magnets, and the connecting section, the rotor core and the connecting section cooperate to limit the permanent magnet in the circumferential direction and the radial direction of the rotor to ensure the matching dimensions of multiple permanent magnets and the rotor core.

[0110] It can be understood that the extending directions of the first wall surface and the side wall of the connecting section are different, and the first wall surface and the side surface of the connecting section are card slots that are engaged with the outer surface of the permanent magnet to effectively limit the permanent magnet between the rotor core and the positioning member.

[0111] In some embodiments, optionally, the shape of the end of the connecting section is the same as the shape of the second groove, and the cross-sectional area of the bottom of the second groove is larger than the cross-sectional area of the region surrounded by the opening of the second groove; wherein, along the axial direction of the rotating shaft, the second groove penetrates the iron core section along the axial direction of the rotor core.

[0112] In this embodiment, the matching structure of the connecting section and the rotor core is further defined.

[0113] The rotor core is provided with a second groove, and the end of the connecting section is inserted into the second groove. The shape of the end of the connecting section is the same as the shape of the second groove.

[0114] Among them, the cross-sectional area of the bottom of the second groove is larger than the cross-sectional area of the region surrounded by the mouth of the second groove. That is to say, the second groove is a groove-shaped structure with a small mouth and a large bottom. When the end of the connecting section is inserted into the second groove, it can limit the positioning member along the radial direction of the rotor core and can limit the positioning member along the circumferential direction of the rotor core, so that the permanent magnet is effectively limited and the situation of the permanent magnet shifting relative to the rotor core is avoided.

[0115] In addition, along the axial direction of the rotating shaft, the second groove penetrates the iron core section along the axial direction of the rotor core. This setting can effectively assemble the positioning member and the rotor core, has the advantage of operation convenience, and is beneficial to improving the assembly efficiency and assembly feasibility.

[0116] In some embodiments, optionally, the first groove and the connecting section are arranged oppositely.

[0117] In this embodiment, the structure of the positioning member is further defined, so that the first groove and the connecting section are arranged oppositely, that is, the first groove is located in the middle of the connecting section. This setting can ensure the thickness of the part of the positioning member at the first groove and can ensure the effectiveness and feasibility of the positioning member to limit the permanent magnet.

[0118] If, along the circumferential direction of the rotating shaft, the first groove is located on one side of the connecting section, then the thickness of the positioning member at the first groove is relatively thin, and the positioning member is easy to deform. In this way, the external force acting on the permanent magnet will be weakened, and the situation of the permanent magnet loosening is likely to occur, and further, the running noise of the motor will increase.

[0119] The second aspect of the present invention provides an electric power steering system, including: the electric power steering motor as in the first aspect.

[0120] The electric power steering system provided by the present invention includes the electric power steering motor as in the first aspect, so it has all the beneficial effects of the above-mentioned electric power steering motor, and will not be elaborated one by one here.

[0121] The third aspect of the present invention provides a vehicle, including: the electric power steering motor as in the first aspect; or the electric power steering system as in the second aspect.

[0122] The vehicle provided by the present invention includes the electric power steering motor as in the first aspect or includes the electric power steering system as in the second aspect, so it has all the beneficial effects of the above-mentioned electric power steering motor or electric power steering system, and will not be elaborated one by one here.

[0123] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0124] The vehicle can also be a fuel vehicle.

[0125] The additional aspects and advantages of the present application will become apparent in the following description section, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0126] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0127] Figure 1 FIG. 1 shows a schematic structural view of a first part of an electric power steering motor according to an embodiment of the present application;

[0128] Figure 2 FIG. 2 shows a schematic structural view of a second part of an electric power steering motor according to an embodiment of the present application;

[0129] Figure 3 FIG. 3 shows a schematic structural view of a third part of an electric power steering motor according to an embodiment of the present application;

[0130] Figure 4 FIG. 4 shows a schematic structural view of a fourth part of an electric power steering motor according to an embodiment of the present application;

[0131] Figure 5 FIG. 5 shows a schematic structural view of a second bearing according to an embodiment of the present application;

[0132] Figure 6 FIG. 6 shows a schematic structural view of a first perspective of a fourth part of an electric power steering motor according to an embodiment of the present application;

[0133] Figure 7 FIG. 7 shows a schematic structural view of a second perspective of a fourth part of an electric power steering motor according to an embodiment of the present application;

[0134] Figure 8 FIG. 8 shows a schematic structural view of an electric power steering motor according to a first embodiment of the present application;

[0135] Figure 9 FIG. 9 shows a partial schematic structural view of an electric power steering motor according to a first embodiment of the present application;

[0136] Figure 10 FIG. 10 shows a schematic structural view of an electric power steering motor according to a second embodiment of the present application;

[0137] Figure 11Shows a partial structural schematic diagram of an electric power steering motor according to the second embodiment of the present application;

[0138] Figure 12 Shows a structural schematic diagram of an electric power steering motor according to the third embodiment of the present application;

[0139] Figure 13 Shows a partial structural schematic diagram of an electric power steering motor according to the third embodiment of the present application;

[0140] Figure 14 Shows a structural schematic diagram of an electric power steering motor according to the fourth embodiment of the present application;

[0141] Figure 15 Shows a partial structural schematic diagram of an electric power steering motor according to the fourth embodiment of the present application.

[0142] Among them, Figures 1 to 15 The corresponding relationship between the reference numerals and the component names in

[0143] 10 Electric power steering motor, 100 Rotor core, 110 Core segment, 120 Shaft hole, 130 Second groove, 132 Bottom of the second groove, 134 Mouth of the second groove, 200 Positioning member, 210 First groove, 230 Connecting segment, 232 First wall surface, 234 Second wall surface, 240 Connecting segment, 300 Positioning ring, 310 Third convex portion, 320 Base material of the positioning ring, 400 Installation cavity, 500 Permanent magnet, 600 Rotating shaft, 700 First bearing, 800 Second bearing, 900 Housing, 910 First bearing cavity, 920 Second bearing cavity, 930 First convex portion, 940 First card slot, 950 Second card slot, 952 Matching inclined surface, 960 Machine shell, 970 End cover, 980 Second convex portion, 1000 First elastic portion, 1100 Welding fixing portion, 1200 Second elastic portion, 1300 Third elastic portion, 1302 Chamfer. Detailed implementation manners

[0144] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0145] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0146] The following refers to Figures 1 to 15Describe an electric power steering motor 10, an electric power steering system, and a vehicle according to some embodiments of the present application.

[0147] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown in, an electric power steering motor 10 according to some embodiments of the present application includes a rotor core 100, a plurality of positioning members 200, a positioning ring 300, a plurality of permanent magnets 500, a rotating shaft 600, a first bearing 700, and a second bearing 800.

[0148] The rotor core 100 includes a plurality of core segments 110.

[0149] The plurality of core segments 110 are stacked.

[0150] Any two adjacent core segments 110 are arranged offset in the clockwise or counterclockwise direction.

[0151] The rotor core 100 is provided with a shaft hole 120.

[0152] The shaft hole 120 axially penetrates through the plurality of core segments 110 along the rotor core 100.

[0153] The plurality of positioning members 200 are provided on the outer peripheral side of the rotor core 100, and the plurality of positioning members 200 are arranged at intervals along the circumferential direction of the rotor core 100.

[0154] The positioning ring 300 is sleeved on the outside of the plurality of positioning members 200.

[0155] An installation cavity 400 is enclosed by two adjacent positioning members 200, the rotor core 100, and the positioning ring 300.

[0156] Each permanent magnet 500 is disposed in an installation cavity 400.

[0157] The rotating shaft 600 passes through the shaft hole 120.

[0158] Both the first bearing 700 and the second bearing 800 are sleeved on the rotating shaft 600.

[0159] The rotor core 100 is located between the first bearing 700 and the second bearing 800.

[0160] At least one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing.

[0161] An electric power steering motor 10 provided by the present application includes a rotor core 100, a plurality of positioning members 200, a positioning ring 300, a plurality of permanent magnets 500, a rotating shaft 600, a first bearing 700, and a second bearing 800.

[0162] The rotor core 100 includes a plurality of core segments 110 stacked along the axial direction of the rotor core 100. Among them, any two adjacent core segments 110 are arranged staggeredly in the clockwise direction, or any two adjacent core segments 110 are arranged staggeredly in the counterclockwise direction. That is to say, any two adjacent core segments 110 are arranged staggeredly in the circumferential direction of the rotor core 100 to form a skewed pole of the rotor. The segmented modular setting of the rotor core 100 has the advantages of being convenient for installation and maintenance, and skewed poles can be formed between the plurality of core segments 110.

[0163] Defining that any two adjacent core segments 110 are arranged staggeredly in the clockwise direction or in the counterclockwise direction can reduce the cogging torque and torque ripple, thereby reducing electromagnetic vibration. That is to say, by dividing the rotor core 100 into a plurality of core segments 110 and arranging any two adjacent core segments 110 staggeredly in the clockwise direction or in the counterclockwise direction, the specific harmonic content in the electric power steering motor 10 can be effectively suppressed, the torque ripple and cogging torque of the electric power steering motor 10 can be improved, and thus the vibration and noise of the electric power steering motor 10 can be reduced.

[0164] Further, the rotor core 100 is provided with a shaft hole 120. The shaft hole 120 penetrates through a plurality of core segments 110 along the axial direction of the rotor core 100. The rotating shaft 600 is inserted into the shaft hole 120. The first bearing 700 is sleeved on the rotating shaft 600, and the second bearing 800 is sleeved on the rotating shaft 600. The first bearing 700 is located outside the rotor core 100, and the second bearing 800 is located outside the rotor core 100. Among them, at least one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing. That is to say, the first bearing 700 is a four-point contact ball bearing, and / or the second bearing 800 is a four-point contact ball bearing.

[0165] The four-point contact ball bearing can enhance the overall anti-deformation ability of the electric power steering motor 10, is beneficial to improving the structural stiffness of the electric power steering motor 10, and can reduce the axial runout amount when the electric power steering motor 10 works. In this way, the vibration performance of the electric power steering motor 10 during operation is further improved, the vibration and noise of the electric power steering motor 10 can be further reduced, and the service performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0166] Further, any one of the plurality of positioning members 200 is disposed on the outer peripheral side of the rotor core 100. An installation cavity 400 is defined by two adjacent positioning members 200, the rotor core 100, and the positioning ring 300. That is, a plurality of installation cavities 400 are defined by the plurality of positioning members 200, the rotor core 100, and the positioning ring 300. Each installation cavity 400 is provided with a permanent magnet 500. The shape of the permanent magnet 500 matches the shape of the installation cavity 400.

[0167] The positioning ring 300, the plurality of positioning members 200, and the rotor core 100 cooperate to fasten and limit the plurality of permanent magnets 500 in the circumferential and radial directions of the rotor core 100, so that the permanent magnets 500 are stably assembled on the rotor core 100. In this way, the situation where the plurality of permanent magnets 500 become loose due to assembly errors can be avoided, the assembly dimensions of the permanent magnets 500 and the rotor core 100 can be ensured, the reliability of the motor can be effectively increased, and the noise of the motor can be suppressed.

[0168] Optionally, when both the first bearing 700 and the second bearing 800 are four-point contact ball bearings, that is, four-point contact ball bearings are provided on both axial sides of the rotor core 100. In this way, the mating area and mating angle between the first bearing 700, the second bearing 800 and the rotating shaft 600 are increased, the overall anti-deformation ability of the rotor can be further enhanced, the structural stiffness of the electric power steering motor 10 can be further improved, the axial end play of the electric power steering motor 10 during operation can be reduced. In this way, the vibration performance of the electric power steering motor 10 during operation is further improved, and the vibration noise of the electric power steering motor 10 can be further reduced.

[0169] In some embodiments, optionally, as Figure 8 、 Figure 10 、 Figure 12 and Figure 14 shown, the electric power steering motor 10 further includes a housing 900 and a first elastic part 1000.

[0170] A first bearing cavity 910 and a second bearing cavity 920 are provided in the housing 900.

[0171] The rotor core 100, the plurality of positioning members 200, the positioning ring 300, the plurality of permanent magnets 500, the rotating shaft 600, the first bearing 700, and the second bearing 800 are all disposed in the housing 900.

[0172] The first bearing 700 is located in the first bearing cavity 910.

[0173] The second bearing 800 is located in the second bearing cavity 920.

[0174] The first elastic part 1000 is disposed in the first bearing cavity 910.

[0175] The first elastic part 1000 abuts between one side of the first bearing 700 facing away from the rotor core 100 and the cavity wall of the first bearing cavity 910.

[0176] The first elastic part 1000 is used to apply an axial pre-tightening force to the first bearing 700.

[0177] Wherein, the first bearing 700 is in interference fit with the rotating shaft 600.

[0178] In this embodiment, the electric power steering motor 10 further includes a housing 900 and a first elastic part 1000.

[0179] The rotor core 100, the plurality of positioning parts 200, the positioning ring 300, the plurality of permanent magnets 500, the rotating shaft 600, the first bearing 700 and the second bearing 800 are all arranged in the housing 900. That is to say, the housing 900 serves as an installation carrier for the rotor core 100, the plurality of positioning parts 200, the positioning ring 300, the plurality of permanent magnets 500, the rotating shaft 600, the first bearing 700 and the second bearing 800, and has the function of installing and fixing the rotor core 100, the plurality of positioning parts 200, the positioning ring 300, the plurality of permanent magnets 500, the rotating shaft 600, the first bearing 700 and the second bearing 800 to ensure the mating dimensions of the rotor core 100, the plurality of positioning parts 200, the positioning ring 300, the plurality of permanent magnets 500, the rotating shaft 600, the first bearing 700 and the second bearing 800.

[0180] A first bearing cavity 910 and a second bearing cavity 920 are provided in the housing 900. The first bearing cavity 910 is used to install the first bearing 700, and the second bearing cavity 920 is used to install the second bearing 800.

[0181] The first bearing 700 is in interference fit with the rotating shaft 600. The first elastic part 1000 is arranged in the first bearing cavity 910. The first bearing 700 is located between the first elastic part 1000 and the rotor core 100. The first elastic part 1000 abuts against the first bearing 700, and the first elastic part 1000 abuts against the cavity wall of the first bearing cavity 910. That is to say, the first elastic part 1000 abuts between one side of the first bearing 700 facing away from the rotor core 100 and the cavity wall of the first bearing cavity 910. The first elastic part 1000 is used to apply an axial pre-tightening force to the first bearing 700 so that the first bearing 700 is stably assembled on the rotating shaft 600.

[0182] It can be understood that after the motor is assembled, the first elastic part 1000 is located between the first bearing 700 and the cavity wall of the first bearing cavity 910. By squeezing the first elastic part 1000, the first elastic part 1000 applies an axial pre-tightening force to the first bearing 700 to ensure the structural stiffness of the electric power steering motor 10 and is beneficial to reducing the axial movement amount of the electric power steering motor 10 during operation.

[0183] It is understandable that the cavity wall of the first bearing cavity 910 functions to limit the first bearing 700. Specifically, the cavity wall of the first bearing cavity 910 is used to radially limit the first bearing 700 on the rotating shaft 600.

[0184] In addition, the first bearing 700 and the rotating shaft 600 are in interference fit to axially and radially limit the first bearing 700 on the rotating shaft 600.

[0185] Optionally, the first elastic part 1000 includes a wave washer, a spring, a torsion spring, a tension spring, etc., which will not be listed one by one here.

[0186] Optionally, the housing 900 includes a machine housing 960 and an end cover 970. One of the machine housing 960 and the end cover 970 is provided with the first bearing cavity 910, and the other of the machine housing 960 and the end cover 970 is provided with the second bearing cavity 920.

[0187] In some embodiments, optionally, a first convex part 930 is provided in the second bearing cavity 920.

[0188] The first convex part 930 abuts against the outer peripheral wall of the second bearing 800.

[0189] The second bearing 800 is in interference fit with the rotating shaft 600.

[0190] When one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing.

[0191] In this embodiment, the mating structure of the housing 900 and the second bearing 800 is further defined.

[0192] Specifically, a first convex part 930 is provided in the second bearing cavity 920. The first convex part 930 abuts against the outer peripheral wall of the second bearing 800. Specifically, the first convex part 930 is riveted to the outside of the second bearing 800. The second bearing 800 is in interference fit with the rotating shaft 600. The first convex part 930 and the rotating shaft 600 cooperate to axially, radially and circumferentially limit the second bearing 800 along the rotating shaft 600. To improve the structural stiffness of the electric power steering motor 10, the axial movement amount during the operation of the electric power steering motor 10 can be reduced, and the overall anti-deformation ability of the electric power steering motor 10 can be enhanced. In this way, the vibration performance during the operation of the electric power steering motor 10 is further improved, the vibration noise of the electric power steering motor 10 can be further reduced, and the service performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0193] Optionally, when one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing, and the first bearing 700 is a non-four-point contact ball bearing.

[0194] Optionally, both the first bearing 700 and the second bearing 800 are four-point contact ball bearings, that is, the first bearing 700 is a four-point contact ball bearing and the second bearing 800 is a four-point contact ball bearing.

[0195] Optionally, the number of the first convex portions 930 is multiple, and the multiple first convex portions 930 are arranged at intervals along the circumferential direction of the rotating shaft 600.

[0196] Optionally, the number of the first convex portions 930 is one.

[0197] In some embodiments, optionally, as Figure 11 and Figure 13 shown, the end face of the second bearing 800 facing the rotor core 100 is connected to the outer peripheral wall of the rotating shaft 600 through a welding fixing portion 1100.

[0198] The second bearing 800 is in clearance fit with the rotating shaft 600.

[0199] When one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing.

[0200] In this embodiment, the fitting structure of the rotating shaft 600 and the second bearing 800 is further defined.

[0201] Specifically, the second bearing 800 is in clearance fit with the rotating shaft 600, and the end face of the second bearing 800 facing the rotor core 100 is connected to the outer peripheral wall of the rotating shaft 600 through a welding fixing portion 1100. That is, the welding fixing portion 1100 stably assembles the second bearing 800 and the rotating shaft 600 together.

[0202] The welding fixing portion 1100 and the rotating shaft 600 cooperate to limit the second bearing 800 axially, radially and circumferentially along the rotating shaft 600. To improve the structural stiffness of the electric power steering motor 10, the axial end play during the operation of the electric power steering motor 10 can be reduced, and the overall anti-deformation ability of the electric power steering motor 10 can be enhanced. In this way, the vibration performance during the operation of the electric power steering motor 10 is further improved, the vibration noise of the electric power steering motor 10 can be further reduced, and the service performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0203] In addition, the second bearing 800 is a four-point contact ball bearing, and the second bearing 800 and the rotating shaft 600 are stably assembled through the welding fixing part 1100. This setting can reduce the influence on the radial clearance of the second bearing 800 and ensure the radial clearance of the second bearing 800. In this way, it is beneficial to reduce the frictional torque when the electric power steering motor 10 operates. That is to say, this setting takes into account reducing the vibration and noise of the electric power steering motor 10 and reducing the frictional torque of the electric power steering motor 10, improving the service performance and market competitiveness of the product.

[0204] Optionally, when one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing, and the first bearing 700 is a non-four-point contact ball bearing.

[0205] Optionally, both the first bearing 700 and the second bearing 800 are four-point contact ball bearings, that is, the first bearing 700 is a four-point contact ball bearing and the second bearing 800 is a four-point contact ball bearing.

[0206] It can be understood that when there is no load, the inner ring of the second bearing 800 is fixed, and the displacement of the outer ring of the second bearing 800 relative to the fixed inner ring from one extreme position to another extreme position along the radial direction of the rotor core 100 is denoted as the radial clearance of the second bearing 800.

[0207] In some embodiments, optionally, the welding fixing part 1100 is arranged around the rotating shaft 600.

[0208] Alternatively, the number of the welding fixing parts 1100 is multiple, and the multiple welding fixing parts 1100 are arranged at intervals along the circumferential direction of the rotating shaft 600.

[0209] In this embodiment, the setting position of the welding fixing part 1100 is further defined.

[0210] Optionally, the welding fixing part 1100 is arranged around the rotating shaft 600, that is, the welding fixing part 1100 is of an annular structure, and along the circumferential direction of the rotating shaft 600, the welding fixing part 1100 is welded around the connection between the rotating shaft 600 and the second bearing 800. That is to say, circumferential full welding of the rotating shaft 600 and the second bearing 800 is achieved. This setting can increase the mating area and mating angle between the welding fixing part 1100 and the rotating shaft 600 and the second bearing 800, which is beneficial to improving the stability and reliability of the assembly of the rotating shaft 600 and the second bearing 800, enhancing the overall anti-deformation ability of the electric power steering motor 10, and reducing the frictional torque of the electric power steering motor 10.

[0211] Optionally, the number of welding fixing parts 1100 is multiple, and the multiple welding fixing parts 1100 are arranged at intervals along the circumferential direction of the rotating shaft 600. This setting can effectively fix the rotating shaft 600 and the second bearing 800 from multiple directions and angles, ensure the balance and consistency of the forces at different positions of the second bearing 800, ensure the radial clearance of the second bearing 800, enhance the overall anti-deformation ability of the electric power steering motor 10, and reduce the friction torque of the electric power steering motor 10. Moreover, this setting is beneficial to reducing the deformation amount at the connection between the rotating shaft 600 and the second bearing 800, beneficial to reducing the process difficulty of connecting the rotating shaft 600 and the second bearing 800, and beneficial to improving the assembly efficiency of the motor.

[0212] In some embodiments, optionally, as Figure 11 shown, a first card slot 940 is further provided in the housing 900.

[0213] The first card slot 940 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910.

[0214] And the first card slot 940 communicates with the second bearing cavity 920.

[0215] The motor further includes a second elastic part 1200.

[0216] The second elastic part 1200 is arranged in the first card slot 940.

[0217] The second elastic part 1200 is arranged around the rotating shaft 600, and the second elastic part 1200 abuts against the second bearing 800. The second elastic part 1200 is used to limit the axial displacement of the second bearing 800.

[0218] In this embodiment, the mating structure of the housing 900 and the second bearing 800 is further defined.

[0219] A first card slot 940 is further provided in the housing 900. The first card slot 940 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910, and the first card slot 940 communicates with the second bearing cavity 920.

[0220] The electric power steering motor 10 further includes a second elastic part 1200. The first card slot 940 is used for installing and fixing the second elastic part 1200. The second elastic part 1200 is arranged in the first card slot 940. The second elastic part 1200 is arranged around the rotating shaft 600, and the second elastic part 1200 abuts against the second bearing 800. The second elastic part 1200 is used to axially limit the second bearing 800 along the rotating shaft 600 to ensure the mating dimensions of the second bearing 800 and the rotating shaft 600. It is beneficial to improve the stability and reliability of the assembly of the rotating shaft 600 and the second bearing 800, enhance the overall anti-deformation ability of the electric power steering motor 10, and reduce the friction torque of the electric power steering motor 10.

[0221] The welding fixing part 1100 and the second elastic part 1200 cooperate to ensure the radial clearance of the second bearing 800 while reducing the vibration and noise of the electric power steering motor 10, which can enhance the anti-deformation ability of the electric power steering motor 10 and reduce the friction torque of the electric power steering motor 10. That is to say, this setting takes into account both reducing the vibration and noise of the electric power steering motor 10 and reducing the friction torque of the electric power steering motor 10, improving the use performance and market competitiveness of the product.

[0222] Optionally, the second elastic part 1200 includes springs, torsion springs, tension springs, etc., which are not listed one by one here.

[0223] In some embodiments, optionally, as Figure 13 shown, a second convex part 980 is provided in the second bearing cavity 920, and the second convex part 980 abuts against the outer peripheral wall of the second bearing 800.

[0224] In some embodiments, optionally, along the axial direction of the rotating shaft 600, the width of the first card slot 940 is smaller than the width of the second elastic part 1200.

[0225] In this embodiment, the mating structure of the first card slot 940 and the second elastic part 1200 is further defined.

[0226] Specifically, along the axial direction of the rotating shaft 600, the width of the first card slot 940 is smaller than the width of the second elastic part 1200. The second elastic part 1200 is in interference fit with the first card slot 940, and the second elastic part 1200 is extruded, and the second elastic part 1200 is deformed by its own tightening to effectively limit the displacement of the second bearing 800 in the axial direction of the rotating shaft 600.

[0227] In some embodiments, optionally, a second convex part 980 is provided in the second bearing cavity 920.

[0228] The second convex part 980 abuts against the outer peripheral wall of the second bearing 800.

[0229] In this embodiment, the mating structure of the second bearing cavity 920 and the second bearing 800 is further defined.

[0230] Specifically, the end face of the second bearing 800 facing the rotor core 100 is connected to the outer peripheral wall of the rotating shaft 600 through the welding fixing part 1100. The second bearing 800 is in clearance fit with the rotating shaft 600. A second convex part 980 is provided in the second bearing cavity 920, and the second convex part 980 abuts against the outer peripheral wall of the second bearing 800.

[0231] When one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing.

[0232] The second convex portion 980 abuts against the outer peripheral wall of the second bearing 800. Specifically, the second convex portion 980 is riveted to the outside of the second bearing 800, and the second convex portion 980 and the welding fixing portion 1100 cooperate to limit the second bearing 800 axially, radially, and circumferentially along the rotating shaft 600. This improves the structural stiffness of the electric power steering motor 10, can reduce the axial play of the electric power steering motor 10 during operation, and can enhance the overall anti-deformation ability of the electric power steering motor 10. In this way, the vibration performance of the electric power steering motor 10 during operation is further improved, the vibration noise of the electric power steering motor 10 can be further reduced, and the service performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0233] Optionally, the number of the second convex portions 980 is multiple, and the multiple second convex portions 980 are arranged at intervals along the circumferential direction of the shaft hole 120.

[0234] Optionally, the number of the second convex portions 980 is one.

[0235] In some embodiments, optionally, as Figure 15 shown, the second bearing 800 is in interference fit with the rotating shaft 600.

[0236] A second card slot 950 is further provided in the housing 900.

[0237] The second card slot 950 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910.

[0238] And the second card slot 950 communicates with the second bearing cavity 920.

[0239] The electric power steering motor 10 further includes a third elastic portion 1300.

[0240] The third elastic portion 1300 is provided in the second card slot 950.

[0241] The third elastic portion 1300 is arranged around the rotating shaft 600, and the third elastic portion 1300 abuts against the second bearing 800. The third elastic portion 1300 is used to limit the axial displacement of the second bearing 800.

[0242] When one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing.

[0243] In this embodiment, the mating structure of the rotating shaft 600 and the second bearing 800 is further defined.

[0244] A second card slot 950 is further provided in the housing 900. The second card slot 950 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910, and the second card slot 950 communicates with the second bearing cavity 920.

[0245] The electric power steering motor 10 further includes a third elastic part 1300. The second card slot 950 is used for installing and fixing the third elastic part 1300. The third elastic part 1300 is disposed in the second card slot 950. The third elastic part 1300 is arranged around the rotating shaft 600, and the third elastic part 1300 abuts against the second bearing 800. The third elastic part 1300 is used for axially limiting the second bearing 800 along the rotating shaft 600 to ensure the matching dimension between the second bearing 800 and the rotating shaft 600. It is beneficial to improve the stability and reliability of the assembly of the rotating shaft 600 and the second bearing 800, enhance the overall anti-deformation ability of the electric power steering motor 10, and reduce the frictional torque of the electric power steering motor 10.

[0246] The second bearing 800 and the rotating shaft 600 are in interference fit. The rotating shaft 600 and the third elastic part 1300 cooperate to stably assemble the second bearing 800 and the rotating shaft 600 together.

[0247] The rotating shaft 600 and the third elastic part 1300 cooperate to axially, radially and circumferentially limit the second bearing 800 along the rotating shaft 600. To improve the structural stiffness of the electric power steering motor 10, reduce the axial end play when the electric power steering motor 10 is working, and enhance the overall anti-deformation ability of the electric power steering motor 10. In this way, the vibration performance of the electric power steering motor 10 during operation is further improved, the vibration noise of the electric power steering motor 10 can be further reduced, and the service performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0248] In addition, the second bearing 800 is a four-point contact ball bearing, the second bearing 800 and the rotating shaft 600 are in interference fit, and the third elastic part 1300 limits the axial displacement of the second bearing 800. This setting can reduce the influence on the radial clearance of the second bearing 800 and ensure the radial clearance of the second bearing 800. In this way, it is beneficial to reduce the frictional torque when the electric power steering motor 10 is running. That is to say, this setting takes into account reducing the vibration noise of the electric power steering motor 10 and reducing the frictional torque of the electric power steering motor 10, and improves the service performance and market competitiveness of the product.

[0249] Optionally, the third elastic part 1300 includes springs, torsion springs, tension springs, etc., which will not be listed one by one here.

[0250] Optionally, when one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is a four-point contact ball bearing and the first bearing 700 is a non-four-point contact ball bearing.

[0251] Optionally, both the first bearing 700 and the second bearing 800 are four-point contact ball bearings, that is, the first bearing 700 is a four-point contact ball bearing and the second bearing 800 is a four-point contact ball bearing.

[0252] It can be understood that when there is no load, the inner ring of the second bearing 800 is fixed, and the displacement of the outer ring of the second bearing 800 relative to the fixed inner ring along the radial direction of the rotor core 100 from one extreme position to another extreme position is denoted as the radial clearance of the second bearing 800.

[0253] In some embodiments, optionally, along the axial direction of the rotating shaft 600, the width of the second card slot 950 is smaller than the width of the third elastic part 1300.

[0254] In this embodiment, the mating structure of the second card slot 950 and the third elastic part 1300 is further defined.

[0255] Specifically, along the axial direction of the rotating shaft 600, the width of the second card slot 950 is smaller than the width of the third elastic part 1300. The third elastic part 1300 is in interference fit with the second card slot 950, and the third elastic part 1300 is extruded, and the self-clamping deformation of the third elastic part 1300 is used to effectively limit the displacement of the second bearing 800 in the axial direction of the rotating shaft 600.

[0256] In some embodiments, optionally, as Figure 15 shown, a chamfer 1302 is provided on the side of the third elastic part 1300 facing away from the second bearing 800.

[0257] A mating inclined surface 952 is provided on the part of the second card slot 950 opposite to the chamfer 1302.

[0258] The chamfer 1302 is in contact with the mating inclined surface 952.

[0259] In this embodiment, the mating structure of the third elastic part 1300 and the second card slot 950 is further defined.

[0260] Specifically, a chamfer 1302 is provided on the side of the third elastic part 1300 facing away from the second bearing 800, a mating inclined surface 952 is provided on the part of the second card slot 950 opposite to the chamfer 1302, and the chamfer 1302 is in contact with the mating inclined surface 952.

[0261] When the third elastic part 1300 is assembled into the second card slot 950, the chamfer 1302 cooperates with the mating inclined surface 952 to play a guiding role, so that the third elastic part 1300 can be smoothly assembled into the second card slot 950 with interference, which not only meets the use requirements of the interference fit between the third elastic part 1300 and the second card slot 950, but also reduces the assembly difficulty of assembling the third elastic part 1300.

[0262] In some embodiments, optionally, at least a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600.

[0263] In this embodiment, the mating structure of the rotor core 100 and the rotating shaft 600 is defined.

[0264] At least a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600. That is, a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600. Or the entire hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600.

[0265] This setting can ensure the mating structure between the rotating shaft 600 and the rotor core 100, and avoid the separation of the rotating shaft 600 and the rotor core 100.

[0266] When a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600, the contact area between the shaft hole 120 and the rotating shaft 600 can be reduced. That is, while ensuring the use requirement of the interference fit between the rotating shaft 600 and the shaft hole 120, the radial force formed by the interference fit between the rotating shaft 600 and the shaft hole 120 can also be reduced due to the reduction of the contact area between the shaft hole 120 and the rotating shaft 600. This can reduce the influence of the radial force on the bonding force between the laminations of the rotor core 100, which is beneficial to reducing the probability of deformation of the laminations of the rotor core 100 and can further reduce the probability of loosening of multiple laminations of the rotor core 100.

[0267] Optionally, the hole wall of the shaft hole 120 is a concave-convex wall. The protrusions of the concave-convex wall are in interference fit with the rotating shaft 600, and the depressions of the concave-convex wall are arranged separately from the rotating shaft 600. The protrusions and depressions of the concave-convex wall are arranged alternately, and both the protrusions and depressions extend along the axial direction of the rotating shaft 600.

[0268] In some embodiments, optionally, as Figure 2 and Figure 3 shown, at least a part of the radially outer surfaces of the plurality of positioning members 200 are provided with first grooves 210.

[0269] The positioning ring 300 is provided with a plurality of third protrusions 310.

[0270] Each third protrusion 310 is inserted into a first groove 210.

[0271] A part of the permanent magnet 500 protrudes from the radially outer surface of the positioning member 200 and is arranged in contact with the inner peripheral wall of the positioning ring 300.

[0272] In this embodiment, the mating structure of the permanent magnet 500, the positioning member 200 and the positioning ring 300 is further defined.

[0273] Specifically, at least a part of the radial outer surfaces of the plurality of positioning members 200 are provided with first grooves 210, that is, the radial outer surfaces of each positioning member 200 are provided with first grooves 210. Or the radial outer surfaces of a part of the positioning members 200 are provided with first grooves 210.

[0274] After assembling the plurality of positioning members 200 and the plurality of permanent magnets 500 on the outer peripheral side of the rotor core 100, the base material 320 of the positioning ring is sleeved on the outside of the plurality of positioning members 200, and the base material 320 of the positioning ring is pressed by a press in the direction from the outer peripheral wall to the inner peripheral wall of the base material of the positioning ring 300, so that a part of the base material 320 of the positioning ring is press-fitted into the first groove 210 to form a third convex portion 310. It can be understood that the part of the base material 320 of the positioning ring located in the first groove 210 is the third convex portion 310, and the third convex portion 310 and the first groove 210 are fitted by embedding. During the press-fitting process, the part of the positioning ring 300 located between two adjacent first grooves 210 will shrink, so that the positioning ring 300 is pressed tightly against the outside of the plurality of permanent magnets 500, so that a part of the permanent magnet 500 protrudes from the radial outer surface of the positioning member 200 and is arranged in contact with the inner peripheral wall of the positioning ring 300.

[0275] The positioning ring 300, the plurality of positioning members 200 and the rotor core 100 cooperate to fasten and limit the plurality of permanent magnets 500 in the circumferential and radial directions of the rotating shaft 600, so that the permanent magnets 500 are stably assembled on the rotor core 100. In this way, it is possible to avoid the loosening of the plurality of permanent magnets 500 caused by assembly errors, to ensure the assembly dimensions of the permanent magnets 500 and the rotor core 100, to effectively increase the reliability of the motor, and to suppress the noise of the motor.

[0276] In addition, the third convex portion 310 of the positioning ring 300 is embedded in the first groove 210 of the positioning member 200, and the cooperation between the third convex portion 310 and the first groove 210 can prevent the positioning ring 300 from moving in the circumferential direction of the rotating shaft 600. In this way, the noise of the electric power steering motor 10 can be further suppressed. The use performance and market competitiveness of the product are further improved.

[0277] In some embodiments, optionally, the number of the third convex portions 310 is less than or equal to the number of the first grooves 210.

[0278] In this embodiment, the mating structure of the third convex portion 310 and the first groove 210 is further defined.

[0279] Specifically, the number of the third convex portions 310 is less than or equal to the number of the first grooves 210.

[0280] When the outer radial surface of each positioning member 200 is provided with a first groove 210 and the number of the third convex portions 310 is less than the number of the first grooves 210, since each positioning member 200 is provided with the first groove 210, in this way, the assembly difficulty of the rotor core 100 and the plurality of positioning members 200 can be simplified, and there is no need to calibrate the assembly position of the positioning member 200 provided with the first groove 210. This setting can ensure the assembly dimensions of the plurality of permanent magnets 500 and the rotor core 100, is beneficial to reducing the assembly difficulty of the electric power steering motor 10, is beneficial to improving the assembly efficiency of the electric power steering motor 10, and is beneficial to reducing the production cost of the product.

[0281] Wherein, the positioning ring 300 is provided with a plurality of third convex portions 310, the number of the third convex portions 310 is less than or equal to the number of the first grooves 210, and each third convex portion 310 is embedded in a first groove 210. When the number of the third convex portions 310 is less than the number of the first grooves 210, a part of the first grooves 210 among the plurality of first grooves 210 are provided with the third convex portions 310, and another part of the first grooves 210 among the plurality of first grooves 210 are not provided with the third convex portions 310, that is to say, not every first groove 210 is provided with the third convex portion 310.

[0282] In some embodiments, optionally, the number of the third convex portions 310 is denoted as M, 2 ≤ M ≤ 10, and M is an even number.

[0283] In this embodiment, the number of the third convex portions 310 is further limited such that the number of the third convex portions 310 is denoted as M, 2 ≤ M ≤ 10, and M is an even number. For example, the number of the third convex portions 310 includes 4, 6, and 8.

[0284] This setting can ensure the mating area and mating angle between the positioning ring 300 and the plurality of positioning members 200. The positioning ring 300 can extrude the plurality of positioning members 200 from multiple directions and multiple angles, and can ensure the balance and consistency of the forces on the plurality of permanent magnets 500. It provides a reliable structural support for ensuring the mating dimensions of the plurality of permanent magnets 500 and the rotor core 100.

[0285] And this setting also takes into account the processing difficulty of the plurality of positioning members 200, simplifies the processing procedures of the plurality of positioning members 200, and is beneficial to reducing the production cost of the plurality of positioning members 200.

[0286] In some embodiments, optionally, the outer radial surface of the positioning member 200 and the inner peripheral wall of the positioning ring 300 are spaced apart.

[0287] In this embodiment, the mating structure of the positioning member 200 and the positioning ring 300 is further limited.

[0288] Specifically, the radial outer surface of the positioning member 200 is spaced from the inner peripheral wall of the positioning ring 300. That is, along the radial direction of the rotating shaft 600, there is a gap between the positioning member 200 and the inner peripheral wall of the positioning ring 300, and the radial outer surface of the positioning member 200 and the inner peripheral wall of the positioning ring 300 are not in contact.

[0289] This setting can not only ensure the effectiveness of fixing the permanent magnet 500 between the positioning member 200 and the rotor core 100 by multiple positioning members 200, but also reduce the machining accuracy requirements for the multiple positioning members 200 and the multiple permanent magnets 500, and can ensure the reliability of rotor assembly. If the radial outer surface of the positioning member 200 is in contact with the inner peripheral wall of the positioning ring 300, the machining accuracy requirements for the positioning member 200 are relatively high. Because if the distance from the radial outer surface of the positioning member 200 to the rotor core 100 is greater than the distance from the radial outer surface of the permanent magnet 500 to the rotor core 100, then the inner peripheral wall of the positioning ring 300 cannot effectively contact the outer peripheral wall of the permanent magnet 500, and thus the purpose of pressing multiple permanent magnets 500 cannot be achieved, and the permanent magnet 500 will become loose.

[0290] It can be understood that the radial outer surface of the positioning member 200 is spaced from the inner peripheral wall of the positioning ring 300, that is, the distance from the radial outer surface of the positioning member 200 to the rotor core 100 is less than the distance from the inner peripheral wall of the positioning ring 300 to the rotor core 100.

[0291] In some embodiments, optionally, the positioning ring 300 is a non-magnetic metal sleeve.

[0292] In this embodiment, the structure of the positioning ring 300 is further defined such that the positioning ring 300 is a non-magnetic metal sleeve. The positioning ring 300 is made of a metal material that will not cause obvious magnetization under the action of a magnetic field. The magnetic permeability of the positioning ring 300 is low and will not affect the operating parameters of the electric power steering motor 10.

[0293] Optionally, the positioning ring 300 includes a stainless steel sleeve, an aluminum alloy sleeve, and a titanium alloy sleeve.

[0294] In some embodiments, optionally, the thickness of the positioning ring 300 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0295] In this embodiment, the structure of the positioning ring 300 is further defined such that the thickness of the positioning ring 300 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm. This setting can ensure the effectiveness and feasibility of fixing multiple permanent magnets 500 and the rotor core 100 by the positioning ring 300, and can also ensure the overall dimensions of the motor.

[0296] Optionally, the thickness of the positioning ring 300 includes 0.2 mm, 0.3 mm, 0.4 mm, etc., which are not listed one by one here.

[0297] In some embodiments, optionally, Figure 2 and Figure 3 As shown, the positioning member 200 includes a connecting section 230 and a connecting section 240 .

[0298] The connecting section 230 has a first wall surface 232 and a second wall surface 234 which are arranged opposite to each other in the radial direction of the rotating shaft 600 .

[0299] The first wall surface 232 is located between the rotor core 100 and the second wall surface 234 .

[0300] The first wall surface 232 is disposed in contact with radial outer surfaces of two adjacent permanent magnets 500 .

[0301] The connecting section 240 extends to the connecting section 230 in the direction of the rotor core 100 .

[0302] The connecting section 240 is sandwiched between two adjacent permanent magnets 500 .

[0303] The rotor core 100 is provided with a second groove 130 .

[0304] An end portion of the connecting section 240 is inserted into the second groove 130 .

[0305] In this embodiment, the structure of the positioning member 200 is further defined.

[0306] The positioning member 200 includes a connecting section 230 and a connecting section 240 . The connecting section 240 extends from the connecting section 230 toward the rotor core 100 . The end of the connecting section 240 away from the connecting section 230 is inserted into the second groove 130 of the rotor core 100 .

[0307] Along the radial direction of the rotating shaft 600 , the positioning member 200 includes a first wall surface 232 and a second wall surface 234 , and the first wall surface 232 and the second wall surface 234 are arranged opposite to each other. The first wall surface 232 is located between the rotor core 100 and the second wall surface 234 .

[0308] The first wall 232 is arranged to fit the radial outer surface of two adjacent permanent magnets 500, and the connecting section 240 is sandwiched between two adjacent permanent magnets 500. The connecting section 230, the rotor core 100 and the connecting section 240 cooperate to limit the permanent magnets 500 in the circumferential direction of the rotor and the radial direction of the rotor to ensure the matching dimensions of multiple permanent magnets 500 and the rotor core 100.

[0309] It is understandable that the first wall 232 and the side wall of the connecting section 240 extend in different directions, and the side surfaces of the first wall 232 and the connecting section 240 are grooves that engage with the outer surface of the permanent magnet 500 to effectively limit the permanent magnet 500 between the rotor core 100 and the positioning member 200.

[0310] In some embodiments, optionally, the shape of the end of the connecting section 240 is the same as the shape of the second groove 130.

[0311] The cross-sectional area of the bottom 132 of the second groove is larger than the cross-sectional area of the region surrounded by the notch 134 of the second groove.

[0312] Wherein, along the axial direction of the rotating shaft 600, the second groove 130 penetrates through the iron core section 110 along the axial direction of the rotor iron core 100.

[0313] In this embodiment, the mating structure of the connecting section 240 and the rotor iron core 100 is further defined.

[0314] The rotor iron core 100 is provided with a second groove 130, and the end of the connecting section 240 is inserted into the second groove 130. The shape of the end of the connecting section 240 is the same as the shape of the second groove 130.

[0315] Wherein, the cross-sectional area of the bottom 132 of the second groove is larger than the cross-sectional area of the region surrounded by the notch 134 of the second groove. That is to say, the second groove 130 is a groove-shaped structure with a small opening and a large bottom. When the end of the connecting section 240 is inserted into the second groove 130, the positioning member 200 can be radially limited along the rotor iron core 100, and the positioning member 200 can be circumferentially limited along the rotor iron core 100, so that the permanent magnet 500 is effectively limited, and the situation that the permanent magnet 500 shifts relative to the rotor iron core 100 is avoided.

[0316] In addition, along the axial direction of the rotating shaft 600, the second groove 130 penetrates through the iron core section 110 along the axial direction of the rotor iron core 100. This setting can effectively assemble the positioning member 200 and the rotor iron core 100, has the advantage of convenient operation, and is beneficial to improving the assembly efficiency and assembly feasibility.

[0317] In addition, along the axial direction of the rotating shaft 600, the second groove 130 penetrates through the iron core section 110 along the axial direction of the rotor iron core 100. This setting can effectively assemble the positioning member 200 and the rotor iron core 100, has the advantage of convenient operation, and is beneficial to improving the assembly efficiency and assembly feasibility.

[0318] In some embodiments, optionally, the first groove 210 and the connecting section 240 are oppositely arranged.

[0319] In this embodiment, the structure of the positioning member 200 is further defined, so that the first groove 210 and the connecting section 240 are oppositely arranged, that is, the first groove 210 is located in the middle of the connecting section 230. This setting can ensure the thickness of the part of the positioning member 200 at the first groove 210, and can ensure the effectiveness and feasibility of the positioning member 200 in limiting the permanent magnet 500.

[0320] If the first groove 210 is located on one side of the connection section 240 in the circumferential direction of the rotation axis 600, the thickness of the positioning member 200 at the first groove 210 is relatively thin, and the positioning member 200 is prone to deformation. In this way, the external force acting on the permanent magnet 500 will be weakened, and the permanent magnet 500 is likely to become loose, thereby increasing the operating noise of the motor.

[0321] An electric power steering system according to some other embodiments of the present application includes: an electric power steering motor 10 as in any of the above embodiments.

[0322] An electric power steering system provided by the present application includes an electric power steering motor 10 as in any of the above embodiments. Therefore, it has all the beneficial effects of the above electric power steering motor 10, which will not be elaborated one by one here.

[0323] A vehicle according to some other embodiments of the present application includes: an electric power steering motor 10 as in any of the above embodiments; or an electric power steering system as in the above embodiments.

[0324] A vehicle provided by the present application includes an electric power steering motor 10 as in any of the above embodiments, or includes an electric power steering system as in the above embodiments. Therefore, it has all the beneficial effects of the above electric power steering motor 10 or electric power steering system, which will not be elaborated one by one here.

[0325] It should be noted that the vehicle can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0326] The vehicle can also be a fuel vehicle.

[0327] Optionally, an electric power steering motor 10 provided by the present application includes: a rotor core 100; a plurality of positioning members 200 disposed on the outer peripheral side of the rotor core 100, and the plurality of positioning members 200 are arranged at intervals in the circumferential direction of the rotor core 100. An installation groove with an opening is defined between two adjacent positioning members 200 and the rotor core 100. The opening is disposed opposite to the outer peripheral wall of the rotor core 100. A first groove 210 is provided on the radially outer surface of at least a part of the plurality of positioning members 200; a plurality of permanent magnets 500, each permanent magnet 500 is disposed in an installation groove, and a part of the permanent magnet 500 protrudes out of the installation groove through the opening; a positioning ring 300 sleeved on the outside of the plurality of positioning members 200. The positioning ring 300 is provided with a plurality of third protrusions 310, and the number of the third protrusions 310 is less than or equal to the number of the first grooves 210. Each third protrusion 310 is embedded in a first groove 210, and the part of the permanent magnet 500 protruding out of the installation groove is attached to the inner peripheral wall of the positioning ring 300. The present application can fasten and limit a plurality of permanent magnets 500 in the circumferential and radial directions of the rotor core 100, and can effectively suppress the noise of the motor. It can be understood that the inner peripheral wall of the positioning ring 300 is located at the opening of the installation groove, that is, an installation cavity 400 is defined by two adjacent positioning members 200, the rotor core 100 and the positioning ring 300.

[0328] The motor further includes a rotating shaft 600, a first bearing 700, a second bearing 800 and a first elastic part 1000. The second bearing 800 is a four-point contact ball bearing, which can enhance the overall anti-deformation ability of the motor, is beneficial to improving the structural stiffness of the motor, and can reduce the axial runout amount during the operation of the motor. In this way, the vibration performance during the operation of the motor is further improved, the vibration noise of the motor can be further reduced, and the use performance and market competitiveness of the motor are greatly improved.

[0329] Optionally, the motor includes: a rotor core 100, which includes a plurality of core segments 110 stacked on top of each other. Any two adjacent core segments 110 are arranged offset in the clockwise or counterclockwise direction. The rotor core 100 is provided with a shaft hole 120 that axially penetrates through the plurality of core segments 110 along the rotor core 100; a plurality of positioning members 200, provided on the outer peripheral side of the rotor core 100, and the plurality of positioning members 200 are arranged at intervals along the circumferential direction of the rotor core 100. An installation groove with an opening is defined between two adjacent positioning members 200 and the rotor core 100. The opening is disposed opposite to the outer peripheral wall of the rotor core 100. At least a part of the radially outer surfaces of the plurality of positioning members 200 are provided with first grooves 210; a plurality of permanent magnets 500, each permanent magnet 500 is disposed in one installation groove, and a part of the permanent magnet 500 protrudes out of the installation groove through the opening; a positioning ring 300, sleeved on the outside of the plurality of positioning members 200. The positioning ring 300 is provided with a plurality of third protrusions 310. The number of the third protrusions 310 is less than or equal to the number of the first grooves 210. Each third protrusion 310 is embedded in one first groove 210. The part of the permanent magnet 500 that protrudes out of the installation groove is disposed in contact with the inner peripheral wall of the positioning ring 300.

[0330] Optionally, the radially outer surface of the positioning member 200 and the inner peripheral wall of the positioning ring 300 are spaced apart.

[0331] Optionally, the number of the third protrusions 310 is denoted as M, 2 ≤ M ≤ 10, and M is an even number.

[0332] Optionally, the positioning ring 300 is a non-magnetic metal sleeve.

[0333] Optionally, the thickness of the positioning ring 300 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0334] Optionally, the positioning member 200 includes: a connecting section 230, the connecting section 230 has a first wall surface 232 and a second wall surface 234 that are oppositely arranged in the radial direction of the rotating shaft 600. The first wall surface 232 is located between the rotor core 100 and the second wall surface 234. The first wall surface 232 is disposed in contact with the radially outer surfaces of two adjacent permanent magnets 500; a connecting section 240, the connecting section 240 extends toward the rotor core 100 from the connecting section 230. The connecting section 240 is clamped between two adjacent permanent magnets 500. The rotor core 100 is provided with a second groove 130. The end of the connecting section 240 is inserted into the second groove 130.

[0335] Optionally, the shape of the end of the connecting section 240 is the same as the shape of the second groove 130. The cross-sectional area of the bottom 132 of the second groove is larger than the cross-sectional area of the region surrounded by the opening 134 of the second groove; wherein, along the axial direction of the rotating shaft 600, the second groove 130 penetrates through the core segment 110.

[0336] Optionally, the first groove 210 and the connecting section 240 are arranged opposite to each other.

[0337] Optionally, the motor further includes: a rotating shaft 600 passing through the shaft hole 120; a first bearing 700 and a second bearing 800, the second bearing 800 being a four-point contact ball bearing, the second bearing 800 being sleeved on the rotating shaft 600, and the second bearing 800 being located outside the rotor core 100.

[0338] Optionally, at least a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600.

[0339] Optionally, the first bearing 700 is in interference fit with the rotating shaft 600.

[0340] Optionally, the first elastic part 1000 is sleeved on the rotating shaft 600, and the first elastic part 1000 is used to apply an axial pre-tightening force to the first bearing 700.

[0341] Optionally, the second bearing 800 is fixed in the second bearing cavity 920 by riveting through the first convex part 930.

[0342] Wherein, any one of the plurality of positioning members 200 is arranged on the outer peripheral side of the rotor core 100, and an installation groove with an opening is enclosed between two adjacent positioning members 200 and the rotor core 100, that is, a plurality of installation grooves are enclosed by the plurality of positioning members 200 and the rotor core 100. Each installation groove is provided with a permanent magnet 500, and a part of the permanent magnet 500 protrudes out of the installation groove through the opening. The shape of the permanent magnet 500 matches the shape of the installation groove.

[0343] At least a part of the radially outer surfaces of the plurality of positioning members 200 are provided with the first grooves 210, that is, the radially outer surface of each positioning member 200 is provided with the first grooves 210. Or the radially outer surfaces of a part of the positioning members 200 are provided with the first grooves 210.

[0344] The positioning ring 300, the plurality of positioning members 200 and the rotor core 100 cooperate to fasten and limit the plurality of permanent magnets 500 in the circumferential and radial directions of the rotor, so that the permanent magnets 500 are stably assembled on the rotor core 100. In this way, the situation that the plurality of permanent magnets 500 become loose due to assembly errors can be avoided, the assembly dimensions of the permanent magnets 500 and the rotor core 100 can be guaranteed, the reliability of the motor can be effectively increased, and the noise of the motor can be suppressed.

[0345] In addition, the third convex portion 310 of the positioning ring 300 is embedded in the first groove 210 of the positioning member 200. The cooperation between the third convex portion 310 and the first groove 210 can prevent the positioning ring 300 from moving in the circumferential direction of the rotor core 100. In this way, the noise of the motor can be further suppressed, and the service performance and market competitiveness of the product are further improved.

[0346] Optionally, the second bearing 800 is a four-point contact ball bearing. When the motor is operating, it can ensure the balance and consistency of the forces on the part where the rotating shaft 600 contacts the second bearing 800, which is beneficial to further reducing the vibration and noise of the motor.

[0347] Optionally, both the first bearing 700 and the second bearing 800 are four-point contact ball bearings. When the motor is operating, it can ensure the balance and consistency of the forces on the part where the rotating shaft 600 contacts the second bearing 800, and it can also ensure the balance and consistency of the forces on the part where the rotating shaft 600 contacts the first bearing 700, which is beneficial to further reducing the vibration and noise of the motor.

[0348] The rotor core 100 and the rotating shaft 600 are in interference fit, which is beneficial to improving the overall structural stiffness of the rotor core 100, the rotating shaft 600 and the bearings, enhancing the overall anti-deformation ability of the rotor core 100, the plurality of permanent magnets 500, the rotating shaft 600, the first bearing 700 and the second bearing 800, so as to reduce the axial movement amount during the operation of the motor.

[0349] Optionally, the first elastic portion 1000 contacts the first bearing 700. Specifically, the first elastic portion 1000 is sleeved on the rotating shaft 600, and the first bearing 700 is located between the first elastic portion 1000 and the rotor core 100. The first elastic portion 1000 is used to apply an axial pre-tightening force to the first bearing 700 so that the first bearing 700 is stably assembled on the rotating shaft 600.

[0350] Optionally, the electric power steering motor 10 includes a first bearing 700 and a second bearing 800, and the second bearing 800 is a four-point contact ball bearing. When the motor is operating, it can ensure the balance and consistency of the forces on the part where the rotating shaft 600 contacts the second bearing 800, which is beneficial to further reducing the vibration and noise of the motor. By defining the mating structure of the rotating shaft 600 and the second bearing 800, the rotating shaft 600 and the second bearing 800 are in interference fit. This setting is beneficial to improving the overall structural stiffness of the rotor core 100, the rotating shaft 600 and the second bearing 800, enhancing the overall anti-deformation ability of the rotor core 100, the plurality of permanent magnets 500, the rotating shaft 600 and the second bearing 800, so as to reduce the axial movement amount during the operation of the motor.

[0351] The motor further includes a first elastic part 1000, and the first elastic part 1000 contacts the first bearing 700. Specifically, the first elastic part 1000 is sleeved on the rotating shaft 600, and the first bearing 700 is located between the first elastic part 1000 and the rotor core 100. The first elastic part 1000 is used to apply an axial pre-tightening force to the first bearing 700 so that the first bearing 700 is stably assembled on the rotating shaft 600. It can be understood that the motor includes a housing 900, and a first bearing cavity 910 is provided in the housing 900. The first bearing 700 is located in the first bearing cavity 910. After the motor is assembled, the first elastic part 1000 is located between the first bearing 700 and the wall of the first bearing cavity 910. By squeezing the first elastic part 1000, the first elastic part 1000 applies an axial pre-tightening force to the first bearing 700.

[0352] The electric power steering motor 10 includes a rotor core 100, a plurality of positioning parts 200, a positioning ring 300, a plurality of permanent magnets 500, a rotating shaft 600, a first bearing 700, and a second bearing 800.

[0353] The rotor core 100 includes a plurality of core segments 110 stacked along the axial direction of the rotor core 100. Among them, any two adjacent core segments 110 are arranged staggeredly in the clockwise direction, or any two adjacent core segments 110 are arranged staggeredly in the counterclockwise direction. That is to say, any two adjacent core segments 110 are arranged staggeredly in the circumferential direction of the rotor core 100 to form a rotor skewed pole. The segmented modular setting of the rotor core 100 has the advantages of being convenient for installation and maintenance, and skew poles can be formed between the plurality of core segments 110.

[0354] Defining that any two adjacent core segments 110 are arranged staggeredly in the clockwise direction or in the counterclockwise direction can reduce the cogging torque and torque ripple, thereby reducing the electromagnetic vibration. That is to say, by dividing the rotor core 100 into a plurality of core segments 110 and making any two adjacent core segments 110 be arranged staggeredly in the clockwise direction or in the counterclockwise direction, the specific harmonic content in the electric power steering motor 10 can be effectively suppressed, the torque ripple and cogging torque of the electric power steering motor 10 can be improved, and thus the effect of reducing the vibration and noise of the electric power steering motor 10 can be achieved.

[0355] Further, the rotor core 100 is provided with a shaft hole 120. The shaft hole 120 axially penetrates through a plurality of core segments 110 along the rotor core 100. The rotating shaft 600 is inserted into the shaft hole 120. The first bearing 700 is sleeved on the rotating shaft 600. The second bearing 800 is sleeved on the rotating shaft 600. The first bearing 700 is located outside the rotor core 100, and the second bearing 800 is located outside the rotor core 100. Among them, at least one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing. That is to say, the first bearing 700 is a four-point contact ball bearing, and / or the second bearing 800 is a four-point contact ball bearing.

[0356] The four-point contact ball bearing can enhance the overall anti-deformation ability of the electric power steering motor 10, which is beneficial to improving the structural stiffness of the electric power steering motor 10. It can reduce the axial end play of the electric power steering motor 10 during operation. In this way, the vibration performance of the electric power steering motor 10 during operation is further improved, and the vibration noise of the electric power steering motor 10 can be further reduced, greatly improving the service performance and market competitiveness of the electric power steering motor 10.

[0357] Furthermore, any one of the plurality of positioning members 200 is disposed on the outer peripheral side of the rotor core 100. The adjacent two positioning members 200, the rotor core 100 and the positioning ring 300 enclose an installation cavity 400, that is, the plurality of positioning members 200, the rotor core 100 and the positioning ring 300 enclose a plurality of installation cavities 400. Each installation cavity 400 is provided with a permanent magnet 500. The shape of the permanent magnet 500 matches the shape of the installation cavity 400. The positioning ring 300, the plurality of positioning members 200 and the rotor core 100 cooperate to fasten and limit the plurality of permanent magnets 500 in the circumferential and radial directions of the rotor core 100, so that the permanent magnets 500 are stably assembled on the rotor core 100. In this way, the situation that the plurality of permanent magnets 500 become loose due to assembly errors can be avoided, the assembly dimensions of the permanent magnets 500 and the rotor core 100 can be ensured, the reliability of the motor can be effectively increased, and the noise of the motor can be suppressed.

[0358] In this application, the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0359] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The above is only the preferred embodiment of this application and is not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. An electric power steering motor, characterized in that: include: A rotor core, the rotor core comprising a plurality of core segments, the plurality of core segments being stacked, any two adjacent core segments being staggered in a clockwise direction or in a counterclockwise direction, the rotor core being provided with an axial hole, the axial hole penetrating the plurality of core segments in the axial direction of the rotor core; A plurality of positioning members are provided on the outer peripheral side of the rotor core, and the plurality of positioning members are arranged at intervals along the circumferential direction of the rotor core; A positioning ring is sleeved on the outer sides of the plurality of positioning members, and two adjacent positioning members, the rotor core and the positioning ring enclose a mounting cavity; A plurality of permanent magnets, each of which is disposed in one of the mounting cavities; A rotating shaft, passing through the shaft hole; First bearing; The second bearing, the first bearing and the second bearing are both sleeved on the rotating shaft, the rotor core is located between the first bearing and the second bearing, and at least one of the first bearing and the second bearing is a four-point contact ball bearing.

2. The electric power steering motor according to claim 1, characterized in that: Also includes: A housing, wherein a first bearing cavity and a second bearing cavity are disposed in the housing, wherein the rotor core, the plurality of positioning members, the positioning ring, the plurality of permanent magnets, the rotating shaft, the first bearing and the second bearing are all disposed in the housing, wherein the first bearing is located in the first bearing cavity, and the second bearing is located in the second bearing cavity; A first elastic portion is disposed in the first bearing cavity, the first elastic portion abuts between a side of the first bearing away from the rotor core and a cavity wall of the first bearing cavity, and the first elastic portion is used to apply an axial preload force to the first bearing; Wherein, the first bearing and the rotating shaft are interference fit.

3. The electric power steering motor according to claim 2, characterized in that: A first convex portion is provided in the second bearing cavity, the first convex portion abuts against the outer peripheral wall of the second bearing, and the second bearing and the rotating shaft are interference fit; When one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing.

4. The electric power steering motor according to claim 2, characterized in that: The end surface of the second bearing facing the rotor core is connected to the outer peripheral wall of the rotating shaft through a welding fixing portion, and the second bearing is loosely matched with the rotating shaft; When one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is the four-point contact ball bearing.

5. The electric power steering motor according to claim 4, characterized in that: The welding fixing portion is arranged around the rotating shaft; or There are multiple welding fixing parts, and the multiple welding fixing parts are arranged at intervals along the circumferential direction of the rotating shaft.

6. The electric power steering motor according to claim 4, characterized in that: A first slot is further provided in the housing, the first slot is located on a side of the second bearing cavity facing the first bearing cavity, and the first slot is communicated with the second bearing cavity; The electric power steering motor also includes a second elastic portion, which is arranged in the first slot, is arranged around the rotating shaft, and is in contact with the second bearing, and is used to limit the axial displacement of the second bearing.

7. The electric power steering motor according to claim 6, characterized in that: Along the axial direction of the rotating shaft, the width of the first clamping groove is smaller than the width of the second elastic portion.

8. The electric power steering motor according to claim 4, characterized in that: A second convex portion is provided in the second bearing cavity, and the second convex portion abuts against the outer peripheral wall of the second bearing.

9. The electric power steering motor according to claim 2, characterized in that: The second bearing is interference fit with the rotating shaft; A second slot is further provided in the housing, the second slot is located on a side of the second bearing cavity facing the first bearing cavity, and the second slot is communicated with the second bearing cavity; The electric power steering motor further includes a third elastic portion, the third elastic portion is disposed in the second slot, the third elastic portion is disposed around the rotating shaft, and the third elastic portion abuts against the second bearing, and the third elastic portion is used to limit the axial displacement of the second bearing; When one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is a four-point contact ball bearing.

10. The electric power steering motor according to claim 9, characterized in that: Along the axial direction of the rotating shaft, the width of the second clamping groove is smaller than the width of the third elastic portion.

11. The electric power steering motor according to claim 10, characterized in that: A chamfer is provided on a side of the third elastic portion facing away from the second bearing, and a matching inclined surface is provided on a portion of the second slot opposite to the chamfer, and the chamfer is fitted with the matching inclined surface.

12. The electric power steering motor according to any one of claims 1 to 11, characterized in that: At least a portion of the hole wall of the shaft hole is interference fit with the rotating shaft.

13. The electric power steering motor according to any one of claims 1 to 11, characterized in that: A first groove is provided on the radial outer surface of at least a part of the plurality of positioning members, and a plurality of third protrusions are provided on the positioning ring, and each of the third protrusions is embedded in one of the first grooves; A portion of the permanent magnet protrudes out of the radial outer surface of the positioning member and is disposed in close contact with the inner circumferential wall of the positioning ring.

14. The electric power steering motor according to claim 13, characterized in that: The number of the third protrusions is less than or equal to the number of the first grooves.

15. The electric power steering motor according to claim 13, characterized in that: The number of the third protrusions is denoted as M, 2≤M≤10, and M is an even number.

16. The electric power steering motor according to claim 13, characterized in that: The radial outer surface of the positioning member is spaced apart from the inner circumferential wall of the positioning ring.

17. The electric power steering motor according to claim 13, characterized in that: The positioning member comprises: A connecting section, wherein the connecting section has a first wall surface and a second wall surface which are arranged opposite to each other in the radial direction of the rotating shaft, wherein the first wall surface is located between the rotor core and the second wall surface, and the first wall surface is arranged to fit the radial outer surfaces of two adjacent permanent magnets; A connecting section extends from the connecting section to the connecting section toward the rotor core, the connecting section is sandwiched between two adjacent permanent magnets, the rotor core is provided with a second groove, and the end of the connecting section is inserted into the second groove.

18. The electric power steering motor according to claim 17, characterized in that: The shape of the end of the connecting section is the same as that of the second groove, and the cross-sectional area of ​​the groove bottom of the second groove is larger than the cross-sectional area of ​​the area surrounded by the groove opening of the second groove; Wherein, along the axial direction of the rotating shaft, the second groove penetrates the core segment along the axial direction of the rotor core.

19. The electric power steering motor according to claim 17, characterized in that: The first groove and the connecting section are arranged opposite to each other.

20. The electric power steering motor according to any one of claims 1 to 11, characterized in that: The positioning ring is a non-magnetic metal sleeve; The thickness of the positioning ring is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

21. An electric power steering system, characterized in that: include: An electric power steering motor as claimed in any one of claims 1 to 20.

22. A vehicle, characterized in that: include: The electric power steering motor according to any one of claims 1 to 20; or The electric power steering system as claimed in claim 21.

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