Electric power steering electric motor, electric power steering system, and vehicle

Abstract

Provided in the present application are an electric power steering electric motor, an electric power steering system, and a vehicle. The electric power steering electric motor comprises: a rotor core, which comprises a plurality of core sections, wherein the plurality of core sections are stacked, any two adjacent core sections are staggered in a clockwise direction or a counterclockwise direction, the rotor core is provided with a shaft hole, and the shaft hole runs through the plurality of core sections in the axial direction of the rotor core; a plurality of positioning members, which are provided on the outer peripheral side of the rotor core and are arranged at intervals in the circumferential direction of the rotor core; a positioning ring, which is sleeved outside the plurality of positioning members, wherein two adjacent positioning members, the rotor core and the positioning ring define a mounting cavity; a plurality of permanent magnets, each permanent magnet being disposed in one mounting cavity; and a rotating shaft, which passes through the shaft hole. The rotor core is located between a first bearing and a second bearing, and at least one of the first bearing and the second bearing is a four-point contact ball bearing. By means of the arrangement, the vibration noise of the electric power steering electric motor can be reduced.

Description

Electric power steering motor, electric power steering system and vehicle

[0001] The present application claims priority to the Chinese Patent Application No. 202411042673.3, filed on July 30, 2024, and titled "Electric Power Steering Motor, Electric Power Steering System and Vehicle", and to the Chinese Patent Application No. 202421836826.7, filed on July 30, 2024, and titled "Electric Power Steering Motor, Electric Power Steering System and Vehicle", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric machines, in particular to an electric power steering motor, an electric power steering system and a vehicle. BACKGROUND

[0003] With the advancement of technology, new energy vehicles are accepted and pursued by more and more families. In the related art, the vibration noise of the electric machine of the new energy vehicle is large, which reduces the use performance of the product and affects the driving experience of the driver. TECHNICAL SOLUTION

[0004] The present application aims to at least solve one of the problems in the prior art or related art.

[0005] To this end, a first aspect of the present application provides an electric power steering motor.

[0006] A second aspect of the present application provides an electric power steering system.

[0007] A third aspect of the present application provides a vehicle.

[0008] Therefore, the present application provides an electric power steering motor, which comprises 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 arranged in a clockwise direction or in a counterclockwise direction, the rotor core being provided with a shaft hole, the shaft hole penetrating the plurality of core segments in an axial direction of the rotor core; a plurality of positioning members, the plurality of positioning members being provided on an outer circumferential side of the rotor core and being arranged at intervals in a circumferential direction of the rotor core; a positioning ring, the positioning ring being sleeved on an outer side of the plurality of positioning members, adjacent two positioning members, the rotor core and the positioning ring enclosing an installation cavity; a plurality of permanent magnets, each permanent magnet being provided in one installation cavity; a rotating shaft, the rotating shaft being provided in the shaft hole; a first bearing; and a second bearing, 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, at least one of the first bearing and the second bearing being a four-point contact ball bearing.

[0009] According to the motor described above, the motor can further have the following additional technical features.

[0010] In some embodiments, the electric power steering motor further comprises a housing, 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 arranged in the housing, the first bearing is arranged in the first bearing cavity, and the second bearing is arranged in the second bearing cavity; a first elastic portion is arranged in the first bearing cavity, the first elastic portion is arranged 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 configured to apply an axial pre-tightening force to the first bearing; and the first bearing is in interference fit with the rotating shaft.

[0011] In some embodiments, the second bearing cavity is provided with a first protrusion, the first protrusion is in abutment with an outer peripheral wall of the second bearing, the second bearing is in interference fit with the rotating shaft, and when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is also a four-point contact ball bearing.

[0012] In some embodiments, an end surface of the second bearing facing the rotor core is connected to an outer peripheral wall of the rotating shaft through a welding fixing portion, the second bearing is in clearance fit with the rotating shaft, and when one of the first bearing and the second bearing is a four-point contact ball bearing, the second bearing is also a four-point contact ball bearing.

[0013] In some embodiments, the welding fixing portion surrounds the rotating shaft, or the number of the welding fixing portions is plural, and the plural welding fixing portions are arranged in a circumferential direction of the rotating shaft.

[0014] In some embodiments, the housing is further provided with a first clamping groove, the first clamping groove is arranged on a side of the second bearing cavity facing the first bearing cavity, and the first clamping groove is in communication with the second bearing cavity; the electric power steering motor further comprises a second elastic portion, the second elastic portion is arranged in the first clamping groove, the second elastic portion surrounds the rotating shaft, and the second elastic portion is in abutment with the second bearing, and the second elastic portion is configured to limit axial displacement of the second bearing.

[0015] In some embodiments, in an axial direction of the rotating shaft, a width of the first clamping groove is smaller than a width of the second elastic portion.

[0016] In some embodiments, the second bearing cavity is provided with a second protrusion, and the second protrusion is in abutment with the outer peripheral wall of the second bearing.

[0017] In some embodiments, exemplarily, the second bearing is in interference fit with the rotating shaft; the housing further comprises a second clamping groove, the second clamping groove is located on the side of the second bearing cavity facing the first bearing cavity, and the second clamping groove is in communication with the second bearing cavity; the electric power steering motor further comprises a third elastic part, the third elastic part is arranged in the second clamping groove, the third elastic part surrounds the rotating shaft, and the third elastic part abuts against the second bearing, the third elastic part is used for limiting 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 also a four-point contact ball bearing.

[0018] In some embodiments, exemplarily, the width of the second clamping groove is smaller than the width of the third elastic part in the axial direction of the rotating shaft.

[0019] In some embodiments, exemplarily, the side of the third elastic part away from the second bearing is provided with a chamfer, the part of the second clamping groove opposite to the chamfer is provided with a matching slope, and the chamfer is in abutment with the matching slope.

[0020] In some embodiments, exemplarily, at least part of the hole wall of the shaft hole is in interference fit with the rotating shaft.

[0021] In some embodiments, exemplarily, the radial outer surface of at least part of the plurality of positioning members is provided with a first groove, the positioning ring is provided with a plurality of third protrusions, each third protrusion is embedded in a first groove, and part of the permanent magnet protrudes out of the radial outer surface of the positioning member and is arranged in abutment with the inner peripheral wall of the positioning ring.

[0022] In some embodiments, exemplarily, the number of third protrusions is less than or equal to the number of first grooves.

[0023] In some embodiments, exemplarily, the number of third protrusions is denoted as M, 2≤M≤10, and M is an even number.

[0024] In some embodiments, exemplarily, the radial outer surface of the positioning member is arranged in spacing with the inner peripheral wall of the positioning ring.

[0025] In some embodiments, exemplarily, the positioning ring is a non-magnetic metal sleeve.

[0026] In some embodiments, exemplarily, the thickness of the positioning ring is greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

[0027] In some embodiments, exemplarily, the positioning member comprises: a connecting section, the connecting section has oppositely arranged first and second wall surfaces 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 abutment with the radial outer surfaces of the two adjacent permanent magnets; and a connecting section, the connecting section extends from the connecting section to the direction of the rotor core, the connecting section is clamped between the two adjacent permanent magnets, the rotor core is provided with a second groove, and the end portion of the connecting section is inserted into the second groove.

[0028] In some embodiments, 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 groove bottom of the second groove is greater than the cross-sectional area of the area surrounded by the groove opening of the second groove; wherein, along the axial direction of the rotation axis, the second groove penetrates the core section along the axial direction of the rotor core.

[0029] In some embodiments, the first groove and the connecting section are oppositely arranged.

[0030] A second aspect of the present application provides an electric power assisted steering system, comprising: the electric power assisted steering motor as in the first aspect.

[0031] A third aspect of the present application provides a vehicle, comprising: the electric power assisted steering motor as in the first aspect; or the electric power assisted steering system as in the second aspect.

[0032] Additional aspects and advantages of the present application will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0034] FIG. 1 shows a first partial structural schematic diagram of an electric power assisted steering motor of one embodiment of the present application;

[0035] FIG. 2 shows a second partial structural schematic diagram of an electric power assisted steering motor of one embodiment of the present application;

[0036] FIG. 3 shows a third partial structural schematic diagram of an electric power assisted steering motor of one embodiment of the present application;

[0037] FIG. 4 shows a fourth partial structural schematic diagram of an electric power assisted steering motor of one embodiment of the present application;

[0038] FIG. 5 shows a structural schematic diagram of a second bearing of one embodiment of the present application;

[0039] FIG. 6 shows a structural schematic diagram of a first perspective view of a fourth part of an electric power assisted steering motor of one embodiment of the present application;

[0040] FIG. 7 shows a structural schematic diagram of a second perspective view of the fourth part of the electric power assisted steering motor of one embodiment of the present application;

[0041] FIG. 8 shows a structural schematic diagram of an electric power assisted steering motor of a first embodiment of the present application;

[0042] Fig. 9 shows a partial structural schematic diagram of an electric power steering motor of the first embodiment of the present application;

[0043] Fig. 10 shows a structural schematic diagram of an electric power steering motor of the second embodiment of the present application;

[0044] Fig. 11 shows a partial structural schematic diagram of an electric power steering motor of the second embodiment of the present application;

[0045] Fig. 12 shows a structural schematic diagram of an electric power steering motor of the third embodiment of the present application;

[0046] Fig. 13 shows a partial structural schematic diagram of an electric power steering motor of the third embodiment of the present application;

[0047] Fig. 14 shows a structural schematic diagram of an electric power steering motor of the fourth embodiment of the present application;

[0048] Fig. 15 shows a partial structural schematic diagram of an electric power steering motor of the fourth embodiment of the present application.

[0049] In the figures, the correspondence between the reference numerals in Figs. 1-15 and the component names is as follows:

[0050] 10 electric power steering motor, 100 rotor core, 110 core segment, 120 shaft hole, 130 second groove, 132 groove bottom of second groove, 134 groove opening of second groove, 200 positioning member, 210 first groove, 230 connecting segment, 232 first wall surface, 234 second wall surface, 240 linking segment, 300 positioning ring, 310 third protrusion, 320 base material of positioning ring, 400 mounting 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 protrusion, 940 first clamping groove, 950 second clamping groove, 952 matching inclined surface, 960 machine shell, 970 end cover, 980 second protrusion, 1000 first elastic portion, 1100 welded fixed portion, 1200 second elastic portion, 1300 third elastic portion, 1302 chamfer. DETAILED DESCRIPTION

[0051] In order to enable a more clear understanding of the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] Many particular details are set forth in the following description in order to provide a thorough understanding of the application. However, the application can be practiced according to the application in other manners that depart from the specific details disclosed herein.

[0053] An electric power steering motor 10, an electric power steering system and a vehicle according to some embodiments of the application are described below with reference to Figs. 1-15.

[0054] As shown in Figs. 1, 2, 3, 4, 5, 6, 7 and 9, an electric power steering motor 10 according to some embodiments of the application comprises 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.

[0055] The rotor core 100 comprises a plurality of core segments 110.

[0056] The plurality of core segments 110 are stacked.

[0057] Any two adjacent core segments 110 are arranged in a clockwise direction or in a counterclockwise direction.

[0058] The rotor core 100 is provided with a shaft hole 120.

[0059] The shaft hole 120 penetrates the plurality of core segments 110 in an axial direction of the rotor core 100.

[0060] The plurality of positioning members 200 are arranged on an outer circumferential side of the rotor core 100 and are spaced apart in a circumferential direction of the rotor core 100.

[0061] The positioning ring 300 is sleeved on an outer side of the plurality of positioning members 200.

[0062] The positioning ring 300 is sleeved on an outer side of the plurality of positioning members 200.

[0063] Each permanent magnet 500 is arranged in one mounting cavity 400.

[0064] The rotating shaft 600 penetrates the shaft hole 120.

[0065] The first bearing 700 and the second bearing 800 are both sleeved on the rotating shaft 600.

[0066] The rotor core 100 is located between the first bearing 700 and the second bearing 800.

[0067] At least one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing.

[0068] The electric power steering motor 10 provided by the application comprises 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.

[0069] The rotor core 100 comprises a plurality of core segments 110 stacked along the axial direction of the rotor core 100. Any two adjacent core segments 110 are arranged in a clockwise direction or in a counterclockwise direction. That is, any two adjacent core segments 110 are arranged in a circumferential direction of the rotor core 100 to form a rotor skew pole. The segmented modularization of the rotor core 100 has the advantages of facilitating installation and maintenance, and skew poles can be formed between the plurality of core segments 110.

[0070] The arrangement of any two adjacent core segments 110 in a clockwise direction or in a counterclockwise direction can reduce the cogging torque and torque ripple, thereby reducing electromagnetic vibration. That is, by dividing the rotor core 100 into a plurality of core segments 110 and arranging any two adjacent core segments 110 in a clockwise direction or in a 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 the vibration noise of the electric power steering motor 10 can be reduced.

[0071] Further, the rotor core 100 is provided with a shaft hole 120 penetrating the plurality of core segments 110 along the axial direction of the rotor core 100, the rotating shaft 600 is arranged in 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 on the outer side of the rotor core 100, and the second bearing 800 is located on the outer side of the rotor core 100. At least one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing. That is, the first bearing 700 is a four-point contact ball bearing, and / or the second bearing 800 is a four-point contact ball bearing.

[0072] The four-point contact ball bearing can enhance the overall deformation resistance of the electric power steering motor 10, improve the structural rigidity of the electric power steering motor 10, and reduce the axial displacement of the electric power steering motor 10 during operation. Thus, 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 is further reduced, and the use performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0073] Further, any one of the plurality of positioning members 200 is arranged at the outer circumferential side of the rotor core 100, and the two adjacent positioning members 200, the rotor core 100 and the positioning ring 300 enclose the mounting cavity 400, that is, the plurality of positioning members 200, the rotor core 100 and the positioning ring 300 enclose the plurality of mounting cavities 400. Each mounting cavity 400 is provided with one permanent magnet 500. The shape of the permanent magnet 500 matches the shape of the mounting cavity 400.

[0074] 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 are loose due to assembly errors can be avoided, the assembly size 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 inhibited.

[0075] Exemplarily, when the first bearing 700 and the second bearing 800 are both four-point contact ball bearings, that is, the four-point contact ball bearings are arranged on both axial sides of the rotor core 100, the cooperation area and the cooperation angle of the first bearing 700, the second bearing 800 and the rotating shaft 600 are increased, the overall deformation resistance of the rotor can be further enhanced, the structural rigidity of the electric power assisted steering motor 10 can be further improved, and the axial displacement of the electric power assisted steering motor 10 during operation can be reduced. In this way, the vibration performance of the electric power assisted steering motor 10 during operation is further improved, and the vibration noise of the electric power assisted steering motor 10 is further reduced.

[0076] In some embodiments, exemplarily as shown in FIGS. 8, 10, 12 and 14, the electric power assisted steering motor 10 further comprises a housing 900 and a first elastic part 1000.

[0077] The housing 900 is provided with a first bearing cavity 910 and a second bearing cavity 920.

[0078] 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 arranged in the housing 900.

[0079] The first bearing 700 is located in the first bearing cavity 910.

[0080] The second bearing 800 is located in the second bearing cavity 920.

[0081] The first elastic part 1000 is arranged in the first bearing cavity 910.

[0082] The first elastic part 1000 is in abutment between the side of the first bearing 700 away from the rotor core 100 and the cavity wall of the first bearing cavity 910.

[0083] The first elastic part 1000 is used to apply an axial pre-tightening force to the first bearing 700.

[0084] The first bearing 700 is in interference fit with the rotating shaft 600.

[0085] In this embodiment, the electric power assisted steering motor 10 further comprises a housing 900 and a first elastic part 1000.

[0086] 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 arranged in the housing 900. That is, the housing 900 serves as a mounting carrier for 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, and has the function of mounting and fixing 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, so as to ensure the cooperation dimension of 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.

[0087] The housing 900 is provided with a first bearing cavity 910 and a second bearing cavity 920, the first bearing cavity 910 is used to mount the first bearing 700, and the second bearing cavity 920 is used to mount the second bearing 800.

[0088] 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 is in abutment with the first bearing 700, and the first elastic part 1000 is in abutment with the cavity wall of the first bearing cavity 910. That is, the first elastic part 1000 is in abutment between the side of the first bearing 700 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 as to stably assemble the first bearing 700 on the rotating shaft 600.

[0089] 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, and the first elastic part 1000 is extruded to apply an axial pre-tightening force to the first bearing 700, so as to ensure the structural rigidity of the electric power assisted steering motor 10, and facilitate to reduce the axial displacement amount of the electric power assisted steering motor 10 during operation.

[0090] It can be understood that the cavity wall of the first bearing cavity 910 has the function of limiting the first bearing 700. For example, the cavity wall of the first bearing cavity 910 is used to limit the first bearing 700 in the radial direction of the rotating shaft 600.

[0091] In addition, the first bearing 700 and the rotating shaft 600 are in interference fit to limit the first bearing 700 in the axial and radial directions of the rotating shaft 600.

[0092] For example, the first elastic part 1000 includes a wave pad, a spring, a torsional spring, a tension spring, and the like, which are not listed one by one here.

[0093] For example, the shell 900 includes a casing 960 and an end cover 970, one of the casing 960 and the end cover 970 is provided with the first bearing cavity 910, and the other of the casing 960 and the end cover 970 is provided with the second bearing cavity 920.

[0094] In some embodiments, for example, the first protrusion 930 is arranged in the second bearing cavity 920.

[0095] The first protrusion 930 abuts against the outer peripheral wall of the second bearing 800.

[0096] The second bearing 800 is in interference fit with the rotating shaft 600.

[0097] 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.

[0098] In this embodiment, the cooperation structure of the shell 900 and the second bearing 800 is further limited.

[0099] For example, the first protrusion 930 is arranged in the second bearing cavity 920, the first protrusion 930 abuts against the outer peripheral wall of the second bearing 800, for example, the first protrusion 930 is riveted on the outer side of the second bearing 800, and the second bearing 800 is in interference fit with the rotating shaft 600. The first protrusion 930 cooperates with the rotating shaft 600 to limit the second bearing 800 in the axial, radial, and circumferential directions of the rotating shaft 600. This improves the structural rigidity of the electric power steering motor 10, reduces the axial displacement of the electric power steering motor 10 during operation, and enhances the overall deformation resistance 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 is further reduced, and the use performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0100] For example, 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.

[0101] Exemplarily, the first bearing 700 and the second bearing 800 are both 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.

[0102] Exemplarily, the number of the first protrusions 930 is multiple, and the multiple first protrusions 930 are arranged along the circumferential direction of the rotating shaft 600.

[0103] Exemplarily, the number of the first protrusions 930 is one.

[0104] In some embodiments, exemplarily, as shown in FIG. 11 and FIG. 13, the second bearing 800 is connected to the outer circumferential wall of the rotating shaft 600 through the welding fixing part 1100 towards the end surface of the rotor core 100.

[0105] The second bearing 800 is in clearance fit with the rotating shaft 600.

[0106] 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.

[0107] In this embodiment, the fitting structure of the rotating shaft 600 and the second bearing 800 is further limited.

[0108] Exemplarily, the second bearing 800 is in clearance fit with the rotating shaft 600, and the second bearing 800 is connected to the outer circumferential wall of the rotating shaft 600 through the welding fixing part 1100 towards the end surface of the rotor core 100. That is, the welding fixing part 1100 firmly assembles the second bearing 800 and the rotating shaft 600 together.

[0109] The welding fixing part 1100 and the rotating shaft 600 cooperate to limit the second bearing 800 along the axial direction, the radial direction and the circumferential direction of the rotating shaft 600. This improves the structural rigidity of the electric power steering motor 10, can reduce the axial displacement amount of the electric power steering motor 10 when working, and can enhance the overall deformation resistance of the electric power steering motor 10. In this way, the vibration performance of the electric power steering motor 10 when running is further improved, which can further reduce the vibration noise of the electric power steering motor 10, greatly improves the use performance and market competitiveness of the electric power steering motor 10.

[0110] 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 by the welding fixing part 1100. This arrangement can reduce the influence on the radial clearance of the second bearing 800 and ensure the radial clearance of the second bearing 800, so as to be conducive to reducing the friction torque of the electric power steering motor 10 during operation. That is, this arrangement takes into account both reducing the vibration noise of the electric power steering motor 10 and reducing the friction torque of the electric power steering motor 10, thereby improving the use performance and market competitiveness of the product.

[0111] Exemplarily, 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.

[0112] Exemplarily, the first bearing 700 and the second bearing 800 are both 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.

[0113] 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 recorded as the radial clearance of the second bearing 800.

[0114] In some embodiments, exemplarily, the welding fixing part 1100 is arranged around the rotating shaft 600.

[0115] Alternatively, 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.

[0116] In this embodiment, the arrangement position of the welding fixing part 1100 is further limited.

[0117] Exemplarily, the welding fixing part 1100 is arranged around the rotating shaft 600, that is, the welding fixing part 1100 is in a ring structure, and the welding fixing part 1100 is welded to the connection between the rotating shaft 600 and the second bearing 800 along the circumferential direction of the rotating shaft 600. That is, the circumferential full welding of the rotating shaft 600 and the second bearing 800 is achieved. This arrangement can increase the cooperation area and cooperation angle of the welding fixing part 1100 with the rotating shaft 600 and the second bearing 800, which is conducive to improving the stability and reliability of the assembly of the rotating shaft 600 and the second bearing 800, thereby enhancing the overall deformation resistance of the electric power steering motor 10 and reducing the friction torque of the electric power steering motor 10.

[0118] Exemplarily, the number of the welding fixing portions 1100 is multiple, and the multiple welding fixing portions 1100 are arranged along the circumference of the rotating shaft 600. This arrangement can effectively fix the rotating shaft 600 and the second bearing 800 from multiple directions and multiple angles, can ensure the balance and consistency of the force on different positions of the second bearing 800, can ensure the radial clearance of the second bearing 800, can enhance the overall deformation resistance of the electric power steering motor 10, and can reduce the friction torque of the electric power steering motor 10. Moreover, this arrangement is beneficial to reduce the deformation of the connection between the rotating shaft 600 and the second bearing 800, is beneficial to reduce the process difficulty of connecting the rotating shaft 600 and the second bearing 800, and is beneficial to improve the assembly efficiency of the motor.

[0119] In some embodiments, exemplarily, as shown in FIG. 11, the housing 900 is further provided with a first clamping groove 940.

[0120] The first clamping groove 940 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910.

[0121] Moreover, the first clamping groove 940 communicates with the second bearing cavity 920.

[0122] The motor further comprises a second elastic portion 1200.

[0123] The second elastic portion 1200 is arranged in the first clamping groove 940.

[0124] The second elastic portion 1200 surrounds the rotating shaft 600, and the second elastic portion 1200 abuts against the second bearing 800. The second elastic portion 1200 is used to limit the axial displacement of the second bearing 800.

[0125] In this embodiment, the cooperation structure of the housing 900 and the second bearing 800 is further limited.

[0126] The housing 900 is further provided with a first clamping groove 940, the first clamping groove 940 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910, and the first clamping groove 940 communicates with the second bearing cavity 920.

[0127] The electric power steering motor 10 further comprises a second elastic portion 1200, and the first clamping groove 940 is used to install and fix the second elastic portion 1200. The second elastic portion 1200 is arranged in the first clamping groove 940, the second elastic portion 1200 surrounds the rotating shaft 600, and the second elastic portion 1200 abuts against the second bearing 800. The second elastic portion 1200 is used to limit the second bearing 800 along the axial direction of the rotating shaft 600, so as to ensure the cooperation size of the second bearing 800 and the rotating shaft 600. This is beneficial to improve the stability and reliability of the assembly of the rotating shaft 600 and the second bearing 800, to enhance the overall deformation resistance of the electric power steering motor 10, and to reduce the friction torque of the electric power steering motor 10.

[0128] The welding fixing part 1100 and the second elastic part 1200 cooperate to reduce the vibration noise of the electric power steering motor 10, ensure the radial clearance of the second bearing 800, enhance the deformation resistance of the electric power steering motor 10, and reduce the friction torque of the electric power steering motor 10. That is, the setting takes into account the reduction of the vibration noise and the friction torque of the electric power steering motor 10, and improves the use performance and market competitiveness of the product.

[0129] Exemplarily, the second elastic part 1200 includes a spring, a torsion spring, a tension spring, and the like, which are not listed one by one here.

[0130] In some embodiments, exemplarily, as shown in FIG. 13, the second protrusion 980 is arranged in the second bearing cavity 920, and the second protrusion 980 abuts against the outer circumferential wall of the second bearing 800.

[0131] In some embodiments, exemplarily, the width of the first clamping groove 940 is smaller than the width of the second elastic part 1200 along the axial direction of the rotating shaft 600.

[0132] In this embodiment, the cooperation structure of the first clamping groove 940 and the second elastic part 1200 is further limited.

[0133] Exemplarily, the width of the first clamping groove 940 is smaller than the width of the second elastic part 1200 along the axial direction of the rotating shaft 600. The second elastic part 1200 is in interference fit with the first clamping groove 940, the second elastic part 1200 is squeezed, and the displacement of the second bearing 800 in the axial direction of the rotating shaft 600 is effectively limited through the self-tightening deformation of the second elastic part 1200.

[0134] In some embodiments, exemplarily, the second protrusion 980 is arranged in the second bearing cavity 920.

[0135] The second protrusion 980 abuts against the outer circumferential wall of the second bearing 800.

[0136] In this embodiment, the cooperation structure of the second bearing cavity 920 and the second bearing 800 is further limited.

[0137] Exemplarily, the end surface of the second bearing 800 facing the rotor core 100 is connected to the outer circumferential 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, the second protrusion 980 is arranged in the second bearing cavity 920, and the second protrusion 980 abuts against the outer circumferential wall of the second bearing 800.

[0138] 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.

[0139] The second protrusion 980 is in abutment with the outer peripheral wall of the second bearing 800, and is exemplarily riveted to the outside of the second bearing 800. The second protrusion 980 cooperates with the welded fixing portion 1100 to limit the second bearing 800 in the axial, radial and circumferential directions of the rotating shaft 600. This improves the structural rigidity of the electric power steering motor 10, reduces the axial displacement of the electric power steering motor 10 during operation, and enhances the overall deformation resistance 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 is further reduced, and the use performance and market competitiveness of the electric power steering motor 10 are greatly improved.

[0140] Exemplarily, the number of second protrusions 980 is multiple, and the multiple second protrusions 980 are arranged at intervals in the circumferential direction of the shaft hole 120.

[0141] Exemplarily, the number of second protrusions 980 is one.

[0142] In some embodiments, the second bearing 800 is exemplarily in interference fit with the rotating shaft 600, as shown in FIG. 15.

[0143] The housing 900 further comprises a second clamping groove 950.

[0144] The second clamping groove 950 is located on the side of the second bearing cavity 920 facing the first bearing cavity 910.

[0145] The second clamping groove 950 is in communication with the second bearing cavity 920.

[0146] The electric power steering motor 10 further comprises a third elastic portion 1300.

[0147] The third elastic portion 1300 is arranged in the second clamping groove 950.

[0148] The third elastic portion 1300 surrounds the rotating shaft 600, and the third elastic portion 1300 is in abutment with the second bearing 800. The third elastic portion 1300 is used to limit the axial displacement of the second bearing 800.

[0149] 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.

[0150] In this embodiment, the cooperation structure of the rotating shaft 600 and the second bearing 800 is further limited.

[0151] The housing 900 further comprises a second clamping groove 950, which is located on the side of the second bearing cavity 920 facing the first bearing cavity 910, and is in communication with the second bearing cavity 920.

[0152] The electric power assisted steering motor 10 further comprises a third elastic part 1300, and the second clamping groove 950 is used for mounting and fixing the third elastic part 1300. The third elastic part 1300 is arranged on the second clamping groove 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 limiting the second bearing 800 in the axial direction of the rotating shaft 600, so as to ensure the matching size of the second bearing 800 and the rotating shaft 600. This is favorable for improving the stability and reliability of the assembly of the rotating shaft 600 and the second bearing 800, and enhancing the overall anti-deformation capability of the electric power assisted steering motor 10, so as to reduce the friction torque of the electric power assisted steering motor 10.

[0153] The second bearing 800 is in interference fit with the rotating shaft 600. The rotating shaft 600 and the third elastic part 1300 are matched to stably assemble the second bearing 800 and the rotating shaft 600 together.

[0154] The rotating shaft 600 and the third elastic part 1300 are matched to limit the second bearing 800 in the axial direction, the radial direction and the circumferential direction of the rotating shaft 600. This improves the structural rigidity of the electric power assisted steering motor 10, reduces the axial displacement of the electric power assisted steering motor 10 during operation, and enhances the overall anti-deformation capability of the electric power assisted steering motor 10. In this way, the vibration performance of the electric power assisted steering motor 10 during operation is further improved, the vibration noise of the electric power assisted steering motor 10 is further reduced, and the use performance and market competitiveness of the electric power assisted steering motor 10 are greatly improved.

[0155] In addition, the second bearing 800 is a four-point contact ball bearing, the second bearing 800 is in interference fit with the rotating shaft 600, 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 favorable for reducing the friction torque of the electric power assisted steering motor 10 during operation. That is to say, this setting takes into account the reduction of the vibration noise and the friction torque of the electric power assisted steering motor 10, and improves the use performance and market competitiveness of the product.

[0156] Exemplarily, the third elastic part 1300 comprises a spring, a torsion spring, a tension spring and the like, which are not listed one by one here.

[0157] Exemplarily, 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.

[0158] Exemplarily, the first bearing 700 and the second bearing 800 are both 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.

[0159] It can be understood that, when no load is applied, the inner ring of the second bearing 800 is fixed, and the outer ring of the second bearing 800 is displaced from one extreme position to another extreme position in the radial direction of the rotor core 100 relative to the fixed inner ring, and the displacement amount is recorded as the radial clearance of the second bearing 800.

[0160] In some embodiments, for example, the width of the second clamping groove 950 in the axial direction of the rotating shaft 600 is less than the width of the third elastic part 1300.

[0161] In this embodiment, the cooperation structure of the second clamping groove 950 and the third elastic part 1300 is further defined.

[0162] For example, the width of the second clamping groove 950 in the axial direction of the rotating shaft 600 is less than the width of the third elastic part 1300. The third elastic part 1300 is in interference fit with the second clamping groove 950, and the third elastic part 1300 is extruded and deformed by its own hoop deformation to effectively limit the displacement of the second bearing 800 in the axial direction of the rotating shaft 600.

[0163] In some embodiments, for example, as shown in FIG. 15, the third elastic part 1300 is provided with a chamfer 1302 on the side away from the second bearing 800.

[0164] The part of the second clamping groove 950 opposite to the chamfer 1302 is provided with a cooperation slope 952.

[0165] The chamfer 1302 is in contact with the cooperation slope 952.

[0166] In this embodiment, the cooperation structure of the third elastic part 1300 and the second clamping groove 950 is further defined.

[0167] For example, the third elastic part 1300 is provided with a chamfer 1302 on the side away from the second bearing 800, the part of the second clamping groove 950 opposite to the chamfer 1302 is provided with a cooperation slope 952, and the chamfer 1302 is in contact with the cooperation slope 952.

[0168] When the third elastic part 1300 is assembled in the second clamping groove 950, the chamfer 1302 cooperates with the cooperation slope 952 to play a guiding role, so that the third elastic part 1300 can be smoothly assembled in the second clamping groove 950 in interference fit, which not only meets the use requirement of interference fit between the third elastic part 1300 and the second clamping groove 950, but also reduces the assembly difficulty of the third elastic part 1300.

[0169] In some embodiments, for example, at least a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600.

[0170] In this embodiment, the fitting structure of the rotor core 100 and the rotating shaft 600 is defined.

[0171] 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. Alternatively, the whole hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600.

[0172] This arrangement can ensure the fitting structure of the rotating shaft 600 and the rotor core 100, and avoid the separation of the rotating shaft 600 and the rotor core 100.

[0173] When a part of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600, the contact area of the shaft hole 120 and the rotating shaft 600 can be reduced, that is, while ensuring the use requirement of the interference fit of the rotating shaft 600 and the shaft hole 120, the radial force caused by the interference fit of the rotating shaft 600 and the shaft hole 120 can be reduced due to the reduction of the contact area of the shaft hole 120 and the rotating shaft 600, the influence of the radial force on the bonding force between the punched sheets of the rotor core 100 can be reduced, the probability of the deformation of the punched sheets of the rotor core 100 can be reduced, and the probability of the loosening of the plurality of punched sheets of the rotor core 100 can be further reduced.

[0174] Illustratively, the hole wall of the shaft hole 120 is a convex-concave wall, the protrusions of the convex-concave wall are in interference fit with the rotating shaft 600, and the depressions of the convex-concave wall are arranged separately from the rotating shaft 600. The protrusions and the depressions of the convex-concave wall are arranged alternately, and both the protrusions and the depressions extend along the axial direction of the rotating shaft 600.

[0175] In some embodiments, illustratively, as shown in FIGS. 2 and 3, the radial outer surface of at least a part of the plurality of positioning members 200 is provided with a first groove 210.

[0176] The positioning ring 300 is provided with a plurality of third protrusions 310.

[0177] Each third protrusion 310 is embedded in a first groove 210.

[0178] A part of the permanent magnet 500 protrudes out of the radial outer surface of the positioning member 200 and is arranged in abutment with the inner peripheral wall of the positioning ring 300.

[0179] In this embodiment, the fitting structure of the permanent magnet 500, the positioning member 200 and the positioning ring 300 is further defined.

[0180] Illustratively, the radial outer surface of at least a part of the plurality of positioning members 200 is provided with a first groove 210, that is, the radial outer surface of each positioning member 200 is provided with a first groove 210. Alternatively, the radial outer surface of a part of the positioning members 200 is provided with a first groove 210.

[0181] After the plurality of positioning members 200 and the plurality of permanent magnets 500 are assembled on the outer circumferential side of the rotor core 100, the base material 320 of the positioning ring is sleeved on the outer side of the plurality of positioning members 200, and the base material 320 of the positioning ring is extruded in the direction from the outer circumferential wall to the inner circumferential wall of the base material of the positioning ring 300 by using a press machine, so that a part of the base material 320 of the positioning ring is press-fitted into the first groove 210 to form the third protrusion 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 protrusion 310, and the third protrusion 310 and the first groove 210 are embeddedly matched. During the press-fitting process, the part of the positioning ring 300 located between the two adjacent first grooves 210 is shrunk, so that the positioning ring 300 is tightly pressed on the outer side of the plurality of permanent magnets 500, so that a part of the permanent magnet 500 protrudes out of the radial outer surface of the positioning member 200 and is arranged in abutment with the inner circumferential wall of the positioning ring 300.

[0182] The positioning ring 300, the plurality of positioning members 200 and the rotor core 100 are matched to fasten and limit the plurality of permanent magnets 500 in the circumferential direction and the radial direction of the rotating shaft 600, 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 are loose due to assembly errors can be avoided, the assembly size 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 inhibited.

[0183] In addition, the third protrusion 310 of the positioning ring 300 is embedded in the first groove 210 of the positioning member 200, and the cooperation of the third protrusion 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 inhibited. The use performance and market competitiveness of the product are further improved.

[0184] In some embodiments, the number of third protrusions 310 is less than or equal to the number of first grooves 210.

[0185] In this embodiment, the cooperation structure of the third protrusion 310 and the first groove 210 is further limited.

[0186] Exemplarily, the number of third protrusions 310 is less than or equal to the number of first grooves 210.

[0187] When the radially outer surface of each positioning member 200 is provided with the first groove 210, and the number of third protrusions 310 is less than the number of first grooves 210, since each positioning member 200 is provided with the first groove 210, the assembly difficulty of the rotor core 100 and the plurality of positioning members 200 is simplified, and it is not necessary to calibrate the assembly position of the positioning member 200 provided with the first groove 210. This setting not only guarantees the assembly size of the plurality of permanent magnets 500 and the rotor core 100, but also helps to reduce the assembly difficulty of the electric power steering motor 10, improve the assembly efficiency of the electric power steering motor 10, and reduce the production cost of the product.

[0188] Among them, the positioning ring 300 is provided with a plurality of third protrusions 310, the number of third protrusions 310 is less than or equal to the number of first grooves 210, and each third protrusion 310 is embedded in a first groove 210. When the number of third protrusions 310 is less than the number of first grooves 210, part of the plurality of first grooves 210 is provided with third protrusions 310, and another part of the plurality of first grooves 210 is not provided with third protrusions 310, that is, not every first groove 210 is provided with third protrusions 310.

[0189] In some embodiments, exemplarily, the number of third protrusions 310 is denoted as M, 2≤M≤10, and M is an even number.

[0190] In this embodiment, the number of third protrusions 310 is further limited, such that the number of third protrusions 310 is denoted as M, 2≤M≤10, and M is an even number. For example, the number of third protrusions 310 includes 4, 6 and 8.

[0191] This setting can guarantee the matching area and matching angle of 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 guarantee the balance and consistency of the force of the plurality of permanent magnets 500. This provides reliable structural support for guaranteeing the matching size of the plurality of permanent magnets 500 and the rotor core 100.

[0192] And this setting also takes into account the processing difficulty of the plurality of positioning members 200, simplifies the processing procedure of the plurality of positioning members 200, and helps to reduce the production cost of the plurality of positioning members 200.

[0193] In some embodiments, exemplarily, the radially outer surface of the positioning member 200 is spaced apart from the inner circumferential wall of the positioning ring 300.

[0194] In this embodiment, the matching structure of the positioning member 200 and the positioning ring 300 is further limited.

[0195] Exemplarily, the radially outer surface of the positioning member 200 is spaced apart from the inner circumferential wall of the positioning ring 300. That is, along the radial direction of the rotation shaft 600, there is a gap between the radially outer surface of the positioning member 200 and the inner circumferential wall of the positioning ring 300, and the radially outer surface of the positioning member 200 and the inner circumferential wall of the positioning ring 300 are not in close contact.

[0196] This arrangement can not only ensure the effectiveness of the plurality of positioning members 200 in fixing the permanent magnets 500 between the positioning members 200 and the rotor core 100, but also reduce the machining precision requirements of the plurality of positioning members 200 and the plurality of permanent magnets 500, thereby ensuring the reliability of the rotor assembly. If the radially outer surface of the positioning member 200 is in close contact with the inner circumferential wall of the positioning ring 300, the machining precision requirement of the positioning member 200 is relatively high. Because if the distance from the radially outer surface of the positioning member 200 to the rotor core 100 is greater than the distance from the radially outer surface of the permanent magnet 500 to the rotor core 100, the inner circumferential wall of the positioning ring 300 cannot effectively contact the outer circumferential wall of the permanent magnet 500, and thus cannot achieve the purpose of pressing the plurality of permanent magnets 500, and the permanent magnets 500 may be loose.

[0197] It can be understood that the radially outer surface of the positioning member 200 is spaced apart from the inner circumferential wall of the positioning ring 300, that is, the distance from the radially outer surface of the positioning member 200 to the rotor core 100 is less than the distance from the inner circumferential wall of the positioning ring 300 to the rotor core 100.

[0198] In some embodiments, exemplarily, the positioning ring 300 is a non-magnetic metal sleeve.

[0199] In this embodiment, the structure of the positioning ring 300 is further limited, such that the positioning ring 300 is a non-magnetic metal sleeve, the positioning ring 300 is a metal material that will not cause significant magnetization under the action of a magnetic field, and the permeability of the positioning ring 300 is low, which will not affect the operating parameters of the electric power steering motor 10.

[0200] Exemplarily, the positioning ring 300 includes a stainless steel sleeve, an aluminum alloy sleeve, and a titanium alloy sleeve.

[0201] In some embodiments, exemplarily, 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.

[0202] In this embodiment, the structure of the positioning ring 300 is further limited, 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 arrangement can not only ensure the effectiveness and feasibility of the positioning ring 300 in fixing the plurality of permanent magnets 500 and the rotor core 100, but also ensure the overall size of the motor.

[0203] Exemplarily, the thickness of the positioning ring 300 includes 0.2 mm, 0.3 mm, 0.4 mm, and the like, which are not listed one by one.

[0204] In some embodiments, as shown in FIGS. 2 and 3, the positioning member 200 includes a connecting segment 230 and a linking segment 240.

[0205] The connecting segment 230 has a first wall surface 232 and a second wall surface 234 oppositely arranged in the radial direction of the rotation axis 600.

[0206] The first wall surface 232 is located between the rotor core 100 and the second wall surface 234.

[0207] The first wall surface 232 is arranged in abutment with the radial outer surfaces of the two adjacent permanent magnets 500.

[0208] The linking segment 240 extends towards the rotor core 100 from the connecting segment 230.

[0209] The linking segment 240 is clamped between the two adjacent permanent magnets 500.

[0210] The rotor core 100 is provided with a second groove 130.

[0211] The end of the linking segment 240 is inserted into the second groove 130.

[0212] In this embodiment, the structure of the positioning member 200 is further defined.

[0213] The positioning member 200 includes the connecting segment 230 and the linking segment 240. The linking segment 240 extends towards the rotor core 100 from the connecting segment 230. The end of the linking segment 240, which is away from the connecting segment 230, is inserted into the second groove 130 of the rotor core 100.

[0214] In the radial direction of the rotation axis 600, the positioning member 200 includes the first wall surface 232 and the second wall surface 234 oppositely arranged. The first wall surface 232 is located between the rotor core 100 and the second wall surface 234.

[0215] The first wall surface 232 is arranged in abutment with the radial outer surfaces of the two adjacent permanent magnets 500. The linking segment 240 is clamped between the two adjacent permanent magnets 500. The connecting segment 230, the rotor core 100 and the linking segment 240 cooperate to limit the permanent magnets 500 in the circumferential direction of the rotor and in the radial direction of the rotor, so as to ensure the cooperation size of the plurality of permanent magnets 500 and the rotor core 100.

[0216] It can be understood that the extending directions of the first wall surface 232 and the side wall of the linking segment 240 are different. The side surfaces of the first wall surface 232 and the linking segment 240 are clamping grooves which are engaged with the outer surfaces of the permanent magnets 500, so as to effectively limit the permanent magnets 500 between the rotor core 100 and the positioning member 200.

[0217] In some embodiments, the end of the connecting section 240 is shaped the same as the second groove 130.

[0218] The cross-sectional area of the groove bottom 132 of the second groove is greater than the cross-sectional area of the area surrounded by the groove opening 134 of the second groove.

[0219] In the axial direction of the rotation axis 600, the second groove 130 penetrates the core section 110 in the axial direction of the rotor core 100.

[0220] In this embodiment, the matching structure of the connecting section 240 and the rotor core 100 is further defined.

[0221] The rotor core 100 is provided with the second groove 130, and the end of the connecting section 240 is inserted into the second groove 130. The end of the connecting section 240 is shaped the same as the second groove 130.

[0222] In the axial direction of the rotation axis 600, the second groove 130 penetrates the core section 110 in the axial direction of the rotor core 100.

[0223] In addition, in the axial direction of the rotation axis 600, the second groove 130 penetrates the core section 110 in the axial direction of the rotor core 100. This arrangement can effectively assemble the positioning member 200 and the rotor core 100, has the advantage of convenient operation, and is beneficial to improve the assembly efficiency and assembly feasibility.

[0224] In addition, in the axial direction of the rotation axis 600, the second groove 130 penetrates the core section 110 in the axial direction of the rotor core 100. This arrangement can effectively assemble the positioning member 200 and the rotor core 100, has the advantage of convenient operation, and is beneficial to improve the assembly efficiency and assembly feasibility.

[0225] In some embodiments, the first groove 210 and the connecting section 240 are oppositely arranged.

[0226] 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 arrangement 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 for limiting the permanent magnet 500.

[0227] If the first groove 210 is located at one side of the connecting section 240 along the circumferential direction of the rotation shaft 600, the positioning member 200 is thin at the first groove 210, and the positioning member 200 is easy to deform, so that the external force acting on the permanent magnet 500 is weakened, and the permanent magnet 500 is easy to loosen, and the running noise of the motor is increased.

[0228] According to another embodiment of the present application, an electric power steering system comprises the electric power steering motor 10 of any of the above embodiments.

[0229] According to another embodiment of the present application, an electric power steering system comprises the electric power steering motor 10 of any of the above embodiments.

[0230] According to another embodiment of the present application, a vehicle comprises the electric power steering motor 10 of any of the above embodiments or the electric power steering system of any of the above embodiments.

[0231] According to another embodiment of the present application, a vehicle comprises the electric power steering motor 10 of any of the above embodiments or the electric power steering system of any of the above embodiments.

[0232] It is worth mentioning that the vehicle can be a new energy vehicle. The new energy vehicle includes a pure electric vehicle, a range-extended electric vehicle, a hybrid electric vehicle, a fuel cell electric vehicle, a hydrogen engine vehicle, etc.

[0233] The vehicle can also be a fuel vehicle.

[0234] Exemplarily, the application provides an electric power steering motor 10, comprising: a rotor core 100; a plurality of positioning members 200 arranged at the outer circumferential side of the rotor core 100 and spaced along the circumferential direction 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, the opening is arranged opposite to the outer circumferential wall of the rotor core 100, and the radial outer surface of at least part of the plurality of positioning members 200 is provided with a first groove 210; a plurality of permanent magnets 500, each of which is arranged in one installation groove, and part of the permanent magnet 500 protrudes out of the installation groove through the opening; and a positioning ring 300 arranged at the outer side 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 of the third protrusions 310 is embedded in one first groove 210, and the part of the permanent magnet 500 protruding out of the installation groove is arranged in abutment with the inner circumferential wall of the positioning ring 300. The application can fasten and limit the 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 circumferential wall of the positioning ring 300 is located at the opening of the installation groove, that is, the installation cavity 400 is enclosed by the two adjacent positioning members 200, the rotor core 100 and the positioning ring 300.

[0235] The motor further comprises 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 deformation resistance of the motor, is conducive to improving the structural rigidity of the motor, can reduce the axial displacement of the motor during operation, so that the vibration performance of the motor during operation is further improved, the vibration noise of the motor is further reduced, and the use performance and market competitiveness of the motor are greatly improved.

[0236] Exemplarily, the motor comprises: a rotor core 100, the rotor core 100 comprising a plurality of core segments 110, the plurality of core segments 110 being stacked, any two adjacent core segments 110 being arranged in a clockwise direction or in an anticlockwise direction, the rotor core 100 being provided with a shaft hole 120, the shaft hole 120 penetrating the plurality of core segments 110 in an axial direction of the rotor core 100; a plurality of positioning members 200, the plurality of positioning members 200 being arranged on an outer circumferential side of the rotor core 100 and being spaced apart in a circumferential direction of the rotor core 100, an installation groove with an opening being enclosed between any two adjacent positioning members 200 and the rotor core 100, the opening being arranged opposite to an outer circumferential wall of the rotor core 100, a radially outer surface of at least some of the plurality of positioning members 200 being provided with a first groove 210; a plurality of permanent magnets 500, each of the plurality of permanent magnets 500 being arranged in one installation groove, and a part of each of the plurality of permanent magnets 500 protruding out of the installation groove through the opening; and a positioning ring 300, the positioning ring 300 being arranged on an outer side of the plurality of positioning members 200, the positioning ring 300 being provided with a plurality of third protrusions 310, the number of the plurality of third protrusions 310 being less than or equal to the number of the first grooves 210, each of the plurality of third protrusions 310 being embedded in one of the first grooves 210, and the part of each of the plurality of permanent magnets 500 protruding out of the installation groove being arranged in abutment with an inner circumferential wall of the positioning ring 300.

[0237] Exemplarily, the radially outer surface of the positioning member 200 is arranged in abutment with the inner circumferential wall of the positioning ring 300.

[0238] Exemplarily, the number of the plurality of third protrusions 310 is denoted as M, 2≤M≤10, and M is an even number.

[0239] Exemplarily, the positioning ring 300 is a non-magnetic metal sleeve.

[0240] Exemplarily, the thickness of the positioning ring 300 is greater than or equal to 0.1mm and less than or equal to 0.5mm.

[0241] Exemplarily, the positioning member 200 comprises: a connecting segment 230, the connecting segment 230 having a first wall surface 232 and a second wall surface 234 arranged opposite to each other in a radial direction of the rotating shaft 600, the first wall surface 232 being arranged in abutment with radially outer surfaces of two adjacent permanent magnets 500; and an abutting segment 240, the abutting segment 240 extending from the connecting segment 230 to the rotor core 100, the abutting segment 240 being arranged between the two adjacent permanent magnets 500, the rotor core 100 being provided with a second groove 130, an end portion of the abutting segment 240 being inserted into the second groove 130.

[0242] Exemplarily, the end portion of the abutting segment 240 has a same shape as that of the second groove 130, a cross-sectional area of a groove bottom 132 of the second groove 130 being greater than a cross-sectional area of a region surrounded by a groove opening 134 of the second groove 130; and the second groove 130 penetrates the core segment 110 in an axial direction of the rotating shaft 600.

[0243] Exemplarily, the first recess 210 and the engaging section 240 are oppositely arranged.

[0244] Exemplarily, the motor further comprises: a rotating shaft 600, which is arranged in 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.

[0245] Exemplarily, at least a portion of the hole wall of the shaft hole 120 is in interference fit with the rotating shaft 600.

[0246] Exemplarily, the first bearing 700 is in interference fit with the rotating shaft 600.

[0247] Exemplarily, the first elastic part 1000 is sleeved on the rotating shaft 600, and the first elastic part 1000 is used for applying an axial pre-tightening force to the first bearing 700.

[0248] Exemplarily, the second bearing 800 is fixed in the second bearing cavity 920 by the first protrusion 930.

[0249] Among the plurality of positioning members 200, any one of the positioning members 200 is arranged on the outer circumferential side of the rotor core 100, and the installation groove with an opening is enclosed between the adjacent two positioning members 200 and the rotor core 100, that is, the plurality of positioning members 200 and the rotor core 100 enclose a plurality of installation grooves. Each installation groove is provided with one 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.

[0250] The radial outer surface of at least a part of the plurality of positioning members 200 is provided with the first recess 210, that is, the radial outer surface of each positioning member 200 is provided with the first recess 210. Alternatively, the radial outer surface of a part of the positioning members 200 is provided with the first recess 210.

[0251] 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 are loose due to assembly errors can be avoided, the assembly size 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 inhibited.

[0252] In addition, the third protrusion 310 of the positioning ring 300 is embedded in the first groove 210 of the positioning member 200, and the third protrusion 310 and the first groove 210 cooperate to prevent the positioning ring 300 from moving in the circumferential direction of the rotor core 100, so that the noise of the motor can be further inhibited. Further improve the use performance and market competitiveness of the product.

[0253] Exemplarily, the second bearing 800 is a four-point contact ball bearing. During operation of the motor, the force balance and consistency of the part of the rotating shaft 600 in contact with the second bearing 800 can be ensured, which is beneficial to further reduce the vibration noise of the motor.

[0254] Exemplarily, the first bearing 700 and the second bearing 800 are both four-point contact ball bearings. During operation of the motor, the force balance and consistency of the part of the rotating shaft 600 in contact with the second bearing 800 can be ensured, and the force balance and consistency of the part of the rotating shaft 600 in contact with the first bearing 700 can be ensured, which is beneficial to further reduce the vibration noise of the motor.

[0255] The rotor core 100 is in interference fit with the rotating shaft 600. This is beneficial to improve the overall structural stiffness of the rotor core 100, the rotating shaft 600 and the bearings, and to enhance the overall deformation resistance 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 displacement amount during operation of the motor.

[0256] Exemplarily, the first elastic portion 1000 is in contact with the first bearing 700. Exemplarily, 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.

[0257] Exemplarily, the electric power steering motor 10 comprises the first bearing 700 and the second bearing 800, and the second bearing 800 is a four-point contact ball bearing. During operation of the motor, the force balance and consistency of the part of the rotating shaft 600 in contact with the second bearing 800 can be ensured, which is beneficial to further reduce the vibration noise of the motor. By limiting the cooperation 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 is beneficial to improve the overall structural stiffness of the rotor core 100, the rotating shaft 600 and the second bearing 800, and to enhance the overall deformation resistance 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 displacement amount during operation of the motor.

[0258] The motor further comprises a first elastic part 1000 in contact with the first bearing 700. Exemplarily, 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 comprises a housing 900, and the housing 900 is provided with a first bearing cavity 910, and 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 cavity wall of the first bearing cavity 910, and the first elastic part 1000 is extruded to apply an axial pre-tightening force to the first bearing 700.

[0259] The electric power assisted steering motor 10 comprises 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.

[0260] The rotor core 100 comprises 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 in a clockwise direction or any two adjacent core segments 110 are arranged in a counterclockwise direction. That is, any two adjacent core segments 110 are arranged in a circumferential direction of the rotor core 100 to form a rotor skew pole, and the segmented modularization of the rotor core 100 has the advantages of facilitating installation and maintenance, and a skew pole can be formed between the plurality of core segments 110.

[0261] The arrangement of any two adjacent core segments 110 in a clockwise direction or in a counterclockwise direction can reduce the cogging torque and torque ripple, thereby reducing the electromagnetic vibration. That is, by dividing the rotor core 100 into a plurality of core segments 110 and arranging any two adjacent core segments 110 in a clockwise direction or in a counterclockwise direction, the specific harmonic content in the electric power assisted steering motor 10 can be effectively suppressed, the torque ripple and cogging torque of the electric power assisted steering motor 10 can be improved, and the vibration noise of the electric power assisted steering motor 10 can be reduced.

[0262] Further, the rotor core 100 is provided with an axial hole 120 penetrating the plurality of core segments 110 along the axial direction of the rotor core 100, the rotating shaft 600 is arranged in the axial 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 on the outer side of the rotor core 100, and the second bearing 800 is located on the outer side of the rotor core 100. At least one of the first bearing 700 and the second bearing 800 is a four-point contact ball bearing. That is, the first bearing 700 is a four-point contact ball bearing, and / or the second bearing 800 is a four-point contact ball bearing.

[0263] The four-point contact ball bearing can enhance the overall deformation resistance of the electric power assisted steering motor 10, improve the structural rigidity of the electric power assisted steering motor 10, reduce the axial displacement of the electric power assisted steering motor 10 during operation, further improve the vibration performance of the electric power assisted steering motor 10 during operation, further reduce the vibration noise of the electric power assisted steering motor 10, and greatly improve the use performance and market competitiveness of the electric power assisted steering motor 10.

[0264] Further, any one of the plurality of positioning members 200 is arranged on the outer circumferential side of the rotor core 100, and the adjacent two positioning members 200, the rotor core 100 and the positioning ring 300 enclose the mounting cavity 400. That is, the plurality of positioning members 200, the rotor core 100 and the positioning ring 300 enclose a plurality of mounting cavities 400. Each mounting cavity 400 is provided with one permanent magnet 500. The shape of the permanent magnet 500 matches the shape of the mounting 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 are loose due to assembly errors can be avoided, the assembly size of the permanent magnet 500 and the rotor core 100 can be ensured, the reliability of the motor can be effectively improved, and the noise of the motor can be inhibited.

[0265] In the present application, the term "plurality" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0266] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "certain embodiments", etc. means that the particular feature, structure, material or characteristic being described in connection with the embodiment or example is included in at least one embodiment or example of the application. The illustrative appearance of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the description of the particular feature, structure, material or characteristic can be combined in any one or more embodiments or examples in a suitable manner. The above description is only the preferred embodiment of the application, and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. An electric power steering motor, wherein, include: The rotor core includes multiple core segments stacked together, with any two adjacent core segments staggered in a clockwise or counterclockwise direction. The rotor core is provided with a shaft hole that penetrates multiple core segments along the axial direction of the rotor core. Multiple positioning elements are disposed on the outer periphery of the rotor core, and the multiple positioning elements are arranged at intervals along the circumference of the rotor core. A positioning ring is sleeved on the outside of the plurality of positioning elements, and two adjacent positioning elements, the rotor core and the positioning ring enclose an installation cavity; Multiple permanent magnets, each of which is disposed in one of the mounting cavities; A rotating shaft passes through the shaft hole; First bearing; The second bearing, both the first bearing and the second bearing are sleeved on the rotating shaft, and the rotor core is located between the first bearing and the second bearing. 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, wherein, Also includes: The housing has a first bearing cavity and a second bearing cavity inside. The rotor core, a plurality of positioning elements, a positioning ring, a plurality of permanent magnets, the rotating shaft, the first bearing and the second bearing are all disposed in the housing. 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 disposed in the first bearing cavity. The first elastic part abuts against 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 axial preload to the first bearing. The first bearing is interference-fitted with the shaft.

3. The electric power steering motor according to claim 2, wherein, The second bearing cavity is provided with a first protrusion, which abuts against the outer peripheral wall of the second bearing, and the second bearing is interference-fitted with the rotating shaft; When either the first bearing or 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, wherein, The end face of the second bearing facing the rotor core is connected to the outer peripheral wall of the shaft by a welded fixing part, and the second bearing is clearance-fitted with the shaft; When either the first bearing or 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, wherein, The welding fixing part is arranged around the rotating shaft; or The number of the welding fixing parts is multiple, and the multiple welding fixing parts are arranged at intervals along the circumference of the rotating shaft.

6. The electric power steering motor according to claim 4 or 5, wherein, The housing is also provided with a first slot, which is located on the side of the second bearing cavity facing the first bearing cavity, and the first slot is in communication with the second bearing cavity; The electric power steering motor also includes a second elastic part, which is disposed in the first slot, surrounds the shaft, and abuts against the second bearing. The second elastic part is used to limit the axial displacement of the second bearing.

7. The electric power steering motor according to claim 6, wherein, Along the axial direction of the rotating shaft, the width of the first slot is smaller than the width of the second elastic part.

8. The electric power steering motor according to claim 4 or 5, wherein, The second bearing cavity is provided with a second protrusion, which abuts against the outer peripheral wall of the second bearing.

9. The electric power steering motor according to claim 2, wherein, The second bearing is interference-fitted with the shaft; The housing is also provided with a second slot, which is located on the side of the second bearing cavity facing the first bearing cavity, and the second slot communicates with the second bearing cavity; The electric power steering motor further includes a third elastic part, which is disposed in the second slot, surrounds the rotating shaft, and abuts against the second bearing. The third elastic part is used to limit the axial displacement of the second bearing. When either the first bearing or 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, wherein, Along the axial direction of the rotating shaft, the width of the second slot is smaller than the width of the third elastic part.

11. The electric power steering motor according to claim 10, wherein, The third elastic part has a chamfer on the side away from the second bearing, and the part of the second slot opposite to the chamfer has a mating slope, and the chamfer fits into the mating slope.

12. The electric power steering motor according to any one of claims 1 to 11, wherein, At least a portion of the hole wall of the shaft hole is interference-fitted with the rotating shaft.

13. The electric power steering motor according to any one of claims 1 to 12, wherein, At least a portion of the positioning elements have a first groove on their radial outer surface, and the positioning ring has a plurality of third protrusions, each of which is embedded in a first groove. A portion of the permanent magnet protrudes from the radial outer surface of the positioning element and is fitted against the inner peripheral wall of the positioning ring.

14. The electric power steering motor according to claim 13, wherein, 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 or 14, wherein, The number of the third protrusions is denoted as M, where 2 ≤ M ≤ 10, and M is an even number.

16. The electric power steering motor according to any one of claims 13 to 15, wherein, The radial outer surface of the positioning element is spaced apart from the inner peripheral wall of the positioning ring.

17. The electric power steering motor according to any one of claims 13 to 16, wherein, The positioning element includes: The connecting section has a first wall and a second wall that are arranged opposite each other in the radial direction of the rotating shaft. The first wall is located between the rotor core and the second wall, and the first wall is arranged to fit the radial outer surface of two adjacent permanent magnets. The connecting section extends toward the rotor core and is sandwiched between two adjacent permanent magnets. The rotor core has 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, wherein, The shape of the end of the connecting segment is the same as the shape of the second groove, and the cross-sectional area of ​​the bottom of the second groove is greater than the cross-sectional area of ​​the area enclosed by the opening of the second groove. Wherein, along the axial direction of the rotating shaft, the second groove penetrates the core section along the axial direction of the rotor core.

19. The electric power steering motor according to claim 17 or 18, wherein, The first groove and the connecting segment are arranged opposite to each other.

20. The electric power steering motor according to any one of claims 1 to 19, wherein, 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, wherein, include: The electric power steering motor as described in any one of claims 1 to 20.

22. A vehicle, wherein, include: Electric power steering motor as described in any one of claims 1 to 20; or The electric power steering system as described in claim 21.

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