EPS power steering motor

Abstract

The EPS power-assisted steering motor comprises a motor body, the motor body comprises a motor shell, a heat dissipation structure is arranged on the motor shell, and the heat dissipation efficiency can be improved; the stator assembly is arranged in the motor shell and comprises a stator iron core; the rotor assembly is rotatably arranged in the stator core and comprises a rotating shaft, one end of the rotating shaft extends into the motor shell and is coaxially sleeved with a gear in an interference manner, gear displacement is avoided, and the connection tightness is improved; the rotor assembly further comprises a rotor iron core, a mounting groove is formed in the circumferential side wall of the rotor iron core, magnetic steel is arranged in the mounting groove, demagnetization of the magnetic steel is avoided by arranging an anti-demagnetization structure, and the reliability of the motor body is guaranteed. The busbar assembly comprises the installation body, the busbar sheet structure and the terminal structure which are of an integrated structure, the terminal structure and the busbar sheet structure are connected in a welded mode, transition pieces in the prior art are omitted, short circuit is avoided, and reliability is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power steering motors, and in particular to EPS power steering motors. Background Art

[0002] The steering system of a car is an important part of the car's driving system. The function of the steering system is to control the direction of the car according to the driver's wishes. Initially, the steering system of a car was usually a mechanical steering system, all of which were mechanical transmission parts, and the driver's physical strength was used as the power source for steering. Since the mechanical steering system is too complex in structure, and the driver's hand force required for steering is large, the load on the driver is high, so it is gradually eliminated. With the continuous improvement of automobile technology, the power steering system has gradually come into people's view because of its relatively labor-saving steering operation. At present, the most widely used power steering systems are the electro-hydraulic power steering system and the electric power steering system.

[0003] Only a small part of the energy required by the above two for normal steering work is provided by the driver, and most of it is provided by hydraulic pressure or motor torque. Hydraulic pump power steering is usually used in electro-hydraulic power steering systems. The system has slow response speed and time delay, which increases system risks and unsafe factors. The motor in the electric power steering system plays the role of power source, requiring it to have high torque density, high power density, low cogging torque and friction torque, so the high reliability and safety of the power steering motor are particularly important.

[0004] To this end, we proposed the EPS power steering motor. Summary of the invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide an EPS power steering motor.

[0006] In a first aspect, the present application provides an EPS power steering motor, comprising: A motor body, the motor body comprising a motor housing, an outer wall of which is provided with a heat dissipation structure; A stator assembly, the stator assembly is arranged inside the motor housing, and comprises a stator core and a winding composed of enameled wire arranged inside the stator core, and an insulating frame is arranged between the stator core and the winding; A rotor assembly, the rotor assembly is coaxially and rotatably arranged inside the stator core, the rotor assembly comprises a rotating shaft, one end of which rotatably passes through the motor housing and extends to the outside of the motor housing, and is coaxially interference sleeved with a gear; The rotor assembly also includes a rotor core, a plurality of mounting grooves are evenly formed on the circumferential side wall of the rotor core, magnetic steel is arranged in the mounting grooves, and an anti-demagnetization structure is arranged on the mounting grooves to prevent the magnetic steel from being demagnetized; A busbar assembly, wherein the busbar assembly is connected to the insulating frame via an interlocking structure, the busbar assembly comprises a mounting body, a busbar structure and a terminal structure, wherein the terminal structure and the busbar structure are welded and connected, and the busbar structure and the winding are welded and connected, and the busbar assembly is an integrated structure.

[0007] According to the technical solution provided in the embodiment of the present application, the heat dissipation structure includes a plurality of heat dissipation ribs, and the plurality of heat dissipation ribs are all annular structures and are evenly distributed on the outer wall of the motor housing along a first direction.

[0008] According to the technical solution provided in the embodiment of the present application, the rotor assembly further includes a fan, which is coaxially fixedly sleeved on the rotating shaft and located inside the motor housing. The fan rotates to form a wind flow and blows the wind flow toward the inner wall of the motor housing. The fan has a plurality of blades, the number of which is an odd number. A weight-reducing hole is also opened on the rotor core along the first direction. The portion of the rotating shaft located at the motor housing has a mounting section, a knurled portion is arranged on the circumferential side wall of the mounting section, and the gear is interference-fitted on the knurled portion.

[0009] According to the technical solution provided in the embodiment of the present application, a bearing chamber is provided on the inner wall of one side in the first direction inside the motor housing, the bearing is provided in the bearing chamber, the outer ring of the bearing is chamfered, the bearing chamber and the outer ring of the bearing are matched, and are used to axially limit the bearing; The anti-demagnetization structure comprises a groove, and the grooves are arranged at the bottoms of both ends of the installation groove.

[0010] According to the technical solution provided in the embodiment of the present application, the bus structure includes a first bus, a second bus and a third bus, the first bus, the second bus and the third bus are all fixedly arranged inside the mounting body, and the first bus, the second bus and the third bus respectively have a first connecting section, a second connecting section and a third connecting section parallel to the second direction, one end of the first connecting section extends to the outside of the mounting body and is fixedly connected to the first lock buckle, one end of the second connecting section extends to the outside of the mounting body and is fixedly connected to the second lock buckle, and one end of the third connecting section extends to the outside of the mounting body and is fixedly connected to the third lock buckle; the second direction is perpendicular to the first direction.

[0011] According to the technical solution provided in the embodiment of the present application, the first bus bar, the second bus bar and the third bus bar also have a fourth connecting segment, a fifth connecting segment and a sixth connecting segment parallel to the first direction, respectively; the fourth connecting segment is fixedly connected to an end of the first connecting segment away from the first lock buckle, the fifth connecting segment is fixedly connected to an end of the second connecting segment away from the second lock buckle, and the sixth connecting segment is fixedly connected to an end of the third connecting segment away from the third lock buckle.

[0012] According to the technical solution provided in the embodiment of the present application, the terminal structure includes a first terminal, a second terminal and a third terminal parallel to the first direction, one end of the first terminal extends to the interior of the mounting body and is welded to an end of the fourth connecting section away from the first connecting section, one end of the second terminal extends to the interior of the mounting body and is welded to an end of the fifth connecting section away from the second connecting section, and one end of the third terminal extends to the interior of the mounting body and is welded to an end of the sixth connecting section away from the third connecting section.

[0013] According to the technical solution provided in the embodiment of the present application, the busbar structure further includes a neutral point connecting piece, which has a seventh connecting segment fixedly arranged inside the mounting body and parallel to the second direction, three eighth connecting segments parallel to the second direction are evenly distributed on one side of the first connecting segment, and one end of the eighth connecting segment away from the seventh connecting segment extends to the outside of the mounting body and is fixedly connected with a fourth lock buckle; The seventh connecting section is provided with a plurality of protrusions and a plurality of recesses on two opposite side walls in the first direction, respectively, and the plurality of protrusions and the plurality of recesses correspond to each other one by one.

[0014] According to the technical solution provided in the embodiment of the present application, the first lock buckle, the second lock buckle, the third lock buckle and the fourth lock buckle all include a first clamping jaw and a second clamping jaw, a clamping space is formed between the first clamping jaw and the second clamping jaw for clamping the enameled wire, and the first lock buckle, the second lock buckle, the third lock buckle and the fourth lock buckle are all provided with a welding plate parallel to the first direction for welding with the enameled wire.

[0015] According to the technical solution provided in the embodiment of the present application, the interlocking structure includes a plurality of connecting members, the plurality of connecting members are evenly arranged in the circumferential direction of the mounting body, the connecting members include a ninth connecting segment parallel to the second direction and a tenth connecting segment parallel to the first direction fixedly connected to an end of the ninth connecting segment away from the mounting body, the tenth connecting segment is provided with a slider extending along its length direction, and the end of the tenth connecting segment away from the ninth connecting segment is provided with a locking portion; The interlocking structure further comprises a sliding groove and a locking groove, which are arranged on the insulating frame and matched with the sliding block, and the locking groove is arranged on the insulating frame and matched with the locking portion; The mounting body is provided with identification marks corresponding to the first bus bar, the second bus bar and the third bus bar.

[0016] In summary, the present technical solution specifically discloses an EPS power steering motor, including a motor body, which includes a motor housing, and a heat dissipation structure is arranged on the motor housing; a stator assembly is arranged inside the motor housing, and includes a stator core and a winding arranged inside the stator core, and an insulating frame is arranged between the stator core and the winding; a rotor assembly is rotatably arranged inside the stator core, and includes a rotating shaft, one end of which extends to the inside of the motor housing and is coaxially sleeved with a gear; the rotor assembly also includes a rotor core, and a plurality of mounting grooves are evenly arranged on the circumferential side wall thereof, and magnets are arranged in the mounting grooves, and demagnetization of the magnets is avoided by arranging an anti-demagnetization structure; a busbar assembly is arranged inside the motor housing and connected to the insulating frame by an interlocking structure, and the busbar assembly includes an integrated mounting body, a busbar structure and a terminal structure, the terminal structure and the busbar structure are welded, and the busbar structure and the winding are welded; By setting up a heat dissipation structure, the heat dissipation efficiency of the motor body during operation is improved, thereby preventing the motor body from being damaged due to high temperature; by using an interference fit connection between the rotating shaft and the gear, gear displacement is avoided and the connection tightness is increased; by using an anti-demagnetization structure, demagnetization of the magnetic steel is avoided and the reliability of the motor body is guaranteed; by welding the busbar structure and the terminal structure, the transition piece in the prior art is saved, short circuit is avoided and reliability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 This is a schematic diagram of the motor body structure.

[0018] Figure 2 This is a cross-sectional view of the motor body.

[0019] Figure 3 Schematic diagram of the rotation axis.

[0020] Figure 4 Schematic diagram of the rotor core.

[0021] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0022] Figure 6 Schematic diagram of the busbar assembly and the insulating frame connection.

[0023] Figure 7 Schematic diagram of the busbar assembly.

[0024] Figure 8 The top view of the busbar assembly.

[0025] Fig. 9 It is a top view of the busbar structure.

[0026] Fig.10 This is a cross-sectional view of the neutral point connecting piece.

[0027] Fig.11 for Figure 7 Enlarged view of point B in the middle.

[0028] Fig.12 Schematic diagram of the insulation skeleton.

[0029] Fig.13 It is a schematic diagram of the bending part in the prior art.

[0030] Numbers in the figure: 1, motor body; 2, motor housing; 3, stator core; 4, winding; 5, motor cover; 6, rotating shaft; 7, gear; 8, rotor core; 9, magnetic steel; 10, mounting body; 11, heat dissipation rib; 12, fan; 13, weight reduction hole; 14, knurling part; 15, bearing; 16, groove; 17, first busbar; 18, second busbar; 19, third busbar; 20, first connecting section; 21, second connecting section; 22, third connecting section; 23, first lock buckle; 24, second lock buckle; 25, third lock buckle; 2 6. Fourth connecting section; 27. Fifth connecting section; 28. Sixth connecting section; 29. ​​First terminal; 30. Second terminal; 31. Third terminal; 32. Neutral point connecting piece; 33. Seventh connecting section; 34. Eighth connecting section; 35. Fourth locking buckle; 36. Raised portion; 37. Recessed portion; 38. Welding plate; 39. Connector; 40. Ninth connecting section; 41. Tenth connecting section; 42. Slider; 43. Bearing chamber; 44. Bending portion; 45. Reinforcing rib; 46. Insulating frame; 47. Slide groove; 48. Locking groove; 49. Locking portion. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Embodiment 1 Conductive busbar of electric power steering (EPS) assist motor; The principle of motor power steering is: data is exchanged between the customer controller and the position sensor on the motor shaft. According to the signal of the position sensor, the customer controller inputs UVW three-phase sinusoidal current to the winding of the motor stator assembly, thereby generating a rotating magnetic field, which interacts with the magnetic field of the magnetic steel of the rotor assembly to generate torque to rotate the rotor assembly, thereby rotating the motor shaft, driving the gears to rotate, and then transmitting power to the steering system to help the driver control the steering of the car.

[0034] Currently, the power of commonly used steering motors is about 1000W, and the power of the EPS power steering motor in this application is 3500W. Therefore, the heat generated by motor loss is also greatly increased. Therefore, the heat dissipation design of the EPS power steering motor is particularly important.

[0035] Please refer to Figure 1 and Figure 2 As shown, the EPS power steering motor includes a motor body 1, the motor body 1 includes a motor housing 2, the axis of which is parallel to the first direction, an installation space is formed inside the motor housing 2, and an opening communicating with the installation space is provided at one end of the motor housing 2. A motor cover 5 is provided at the opening, and optionally, the motor cover 5 and the motor housing 2 are connected by 6 M6 bolts evenly distributed in the circumferential direction; the first direction is Figure 2 mid-horizontal direction; Furthermore, a heat dissipation structure is provided on the outer wall of the motor housing 2, and the heat dissipation structure includes a plurality of heat dissipation ribs 11, and the heat dissipation ribs 11 are annular structures, and the plurality of heat dissipation ribs 11 are evenly distributed on the outer wall of the motor housing 2 along a first direction, and the heat dissipation ribs 11 extend away from the motor housing 2, so that the heat dissipation ribs 11 are in the form of protrusions on the outer wall of the motor housing 2, thereby increasing the contact area with the outside air, improving the heat dissipation efficiency, extending the service life of the motor body 1, and reducing the risk caused by high temperature; It should be noted that the motor housing 2 and the motor cover 5 can be made of aluminum, so as to have good thermal conductivity.

[0036] The stator assembly is arranged inside the installation space, and the stator assembly includes a stator core 3, which is an annular structure and is coaxial with the motor housing 2, and the stator core 3 has a first space inside; Furthermore, the stator assembly also includes a winding 4 , which is arranged in the first space. The winding 4 is composed of enameled wire, and an insulating frame 46 is arranged between the winding 4 and the stator core 3 .

[0037] A rotor assembly, the rotor assembly is rotatably disposed inside the stator core 3 and is coaxial with the stator core 3, the rotor assembly includes a rotor core 8 and a rotating shaft 6, the rotor core 8 and the rotating shaft 6 both extend in a first direction, and the rotor core 8 is coaxially fixedly sleeved on the rotating shaft 6, the two ends of the rotating shaft 6 are respectively a first end and a second end, the first end rotatably penetrates the motor housing 2 and extends to the outside of the motor housing 2, and the second end rotatably penetrates the motor cover 5; Furthermore, if Figure 3 As shown, the first end has a mounting section, and a knurled portion 14 is provided on the circumferential side wall of the mounting section. A gear 7 is sleeved on the knurled portion 14, and there is an interference fit between the knurled portion 14 and the gear 7: Optionally, the gear 7 has a through hole, which is a light hole with a specification of 14H7, the knurling specification of the knurling part 14 is m0.2, and the diameter specification of the knurling part 14 is 14.1H7, so that the knurling part 14 and the gear 7 have an interference fit, which ensures that the gear 7 transmits the torque circumferentially and ensures that the gear 7 does not fall off under the axial tension; the gear 7 is a helical gear; Furthermore, in order to meet the requirements of fast response, a lower crack ratio is designed: The outer diameter of the stator core 3 is 85 mm, the inner diameter is 46.1 mm, and the crack ratio is 46.1 / 85=0.5459; The length of the rotor core 8 is 61.5 mm; Therefore, a slender rotor was designed with an aspect ratio of 61.5 / 46.1=1.33; The main purpose of designing a slender rotor is to reduce the rotor's rotational inertia moment and reduce the torque consumed by the rotor itself when the motor suddenly starts or suddenly turns forward or reverse, thereby improving the response speed of the steering system. According to the following formula: ; ; in, is the moment of inertia; is the rotor mass; is the rotor radius; is the moment of inertia; is the angular acceleration; In summary, it can be concluded that by reducing the mass of the rotor itself and reducing the rotor radius, the inertia moment can be reduced, thereby improving the response speed of the steering system.

[0038] like Figure 4 and Figure 5As shown, a plurality of mounting grooves are evenly provided on the circumferential side wall of the rotor core 8, and a magnetic steel 9 is arranged in the mounting groove. A first magnetic field is generated by energizing the winding 4, and the first magnetic field and the second magnetic field generated by the magnetic steel 9 repel each other, thereby causing the rotor assembly to rotate. Due to the repulsion between the first magnetic field and the second magnetic field, a demagnetization field is generated at both ends of the magnetic steel 9 along the circumferential direction of the rotor core 8, and therefore an anti-demagnetization structure is designed to prevent the magnetic steel 9 from being demagnetized; Furthermore, the anti-demagnetization structure includes a groove 16, and a groove 16 is provided at both ends of the mounting groove along the circumference of the rotor core 8, thereby forming an air gap inside the groove 16, which increases the magnetic resistance, thereby reducing the gathering of the magnetic flux lines of the first magnetic field and the second magnetic field in the air gap, thereby avoiding demagnetization; optionally, the groove radius is 0.5 mm.

[0039] A weight-reducing hole 13 is formed on the rotor core 8 along a first direction to reduce the weight of the rotor core 8; Furthermore, if Figure 2 As shown, the rotor assembly also includes a fan 12, which is coaxially fixedly sleeved on the rotating shaft 6 and is located on the side of the rotor core 8 away from the motor cover 5. The rotating shaft 6 rotates through the rotation of the rotor assembly, driving the fan 12 to rotate, so that the air in the motor housing 2 flows to form a wind flow. Since the motor body 1 generates heat when working, the wind flow can take away the heat and blow it to the inner wall of the motor housing 2 by the fan 12 to achieve heat exchange with the motor housing 2. The heat is transferred from the motor housing 2 to the heat dissipation ribs 11 and heat is dissipated through the heat dissipation ribs 11. The wind flow after heat exchange flows through the winding through the first space and then enters the weight reduction hole 13, taking away the heat again, and is blown to the inner wall of the motor housing 2 by the fan 12 again for heat dissipation, thereby improving the heat dissipation efficiency and helping to quickly reduce the internal temperature of the motor housing 2. It should be noted that the fan 12 has multiple blades, and the number of blades is an odd number, which helps to reduce wind noise and reduce the risk of blade resonance.

[0040] The rotor assembly also includes a bearing 15, which is arranged in a bearing chamber 43. The bearing chamber 43 is arranged on the inner wall of the motor housing 2. The bearing chamber 43 is located on the inner wall of the motor housing 2 away from the motor cover 5, and its end close to the motor cover 5 is open. The outer ring of the bearing 15 is chamfered. After the bearing 15 is installed in the bearing chamber 43, the opening of the bearing chamber 43 at one end close to the motor cover 5 is cold extruded, so that the opening of the bearing chamber 43 at one end close to the motor cover 5 is bent and adapted to the chamfer of the outer ring of the bearing 15, thereby realizing axial limitation of the bearing 15 and preventing the bearing 15 from shifting.

[0041] The busbar assembly is arranged in the installation space and is located on the side of the stator core 3 close to the motor cover 5. The busbar assembly is connected to the insulating frame 46 through an interlocking structure; Furthermore, if Figures 6 to 10As shown, the busbar assembly includes a mounting body 10, a busbar structure and a terminal structure, the terminal structure and the busbar structure are welded and connected, and the busbar structure and the winding 4 are welded and connected, and the busbar assembly is an integrated structure; the busbar structure and the terminal structure are both made of metal, the mounting body 10 is injection molded, and the busbar structure, the terminal structure and the mounting body 10 are integrally injection molded; It should be noted that the mounting body 10 is an annular structure, which is coaxial with the motor housing 2, and the busbar structure and the terminal structure each have two groups, and are distributed in a centrally symmetrical manner on the mounting body 10; Further, the busbar structure includes a first busbar 17, a second busbar 18 and a third busbar 19; The first busbar 17 has a first connecting section 20 parallel to the second direction, the first connecting section 20 is fixedly arranged inside the mounting body 10, and one end of the first connecting section 20 extends to the outside of the mounting body 10 and is fixedly connected to the first lock buckle 23. The first busbar 17 also has a fourth connecting section 26 parallel to the first direction, the fourth connecting section 26 is fixedly arranged inside the mounting body 10, and one end of the fourth connecting section 26 is fixedly connected to an end of the first connecting section 20 away from the first lock buckle 23. Optionally, the first connecting section 20, the fourth connecting section 26 and the first lock buckle 23 are integrally formed; the second direction is Figure 2 a middle vertical direction, the second direction being perpendicular to the first direction; The second busbar 18 has a second connecting section 21 parallel to the second direction, the second connecting section 21 is fixedly arranged inside the mounting body 10, and one end of the second connecting section 21 extends to the outside of the mounting body 10 and is fixedly connected with a second lock buckle 24. The second busbar 18 also has a fifth connecting section 27 parallel to the first direction, the fifth connecting section 27 is fixedly arranged inside the mounting body 10, one end of the fifth connecting section 27 is fixedly connected to one end of the second connecting section 21 away from the second lock buckle 24, and optionally, the second connecting section 21, the fifth connecting section 27 and the second lock buckle 24 are integrally formed; The third bus bar 19 has a third connecting segment 22 parallel to the second direction, the third connecting segment 22 is fixedly arranged inside the mounting body 10, and one end of the third connecting segment 22 extends to the outside of the mounting body 10 and is fixedly connected with a third locking buckle 25. The third bus bar 19 also has a sixth connecting segment 28 parallel to the first direction, the sixth connecting segment 28 is fixedly arranged inside the mounting body 10, one end of the sixth connecting segment 28 is fixedly connected to one end of the third connecting segment 22 away from the third locking buckle 25. Optionally, the third connecting segment 22, the sixth connecting segment 28 and the third locking buckle 25 are integrally formed.

[0042] The terminal structure includes a first terminal 29, a second terminal 30 and a third terminal 31 which are parallel to the first direction, and the first terminal 29, the second terminal 30 and the third terminal 31 are all parallel to the first direction; One end of the first terminal 29 extends to the inside of the mounting body 10 and is welded to an end of the fourth connecting section 26 away from the first connecting section 20 , and the other end of the first terminal 29 extends to the outside of the motor cover 5 for connection with an external mechanism; One end of the second terminal 30 extends to the inside of the mounting body 10 and is welded to an end of the fifth connecting section 27 away from the second connecting section 21 , and the other end of the second terminal 30 extends to the outside of the motor cover 5 for connection with an external structure; One end of the third terminal 31 extends to the inside of the mounting body 10 and is welded to an end of the sixth connecting section 28 away from the third connecting section 22, and the other end of the third terminal 31 extends to the outside of the motor cover 5 for connection with an external structure; Therefore, the first terminal 29, the second terminal 30 and the third terminal 31 are directly welded and connected to the first bus 17, the second bus 18 and the third bus 19 respectively. Compared with the prior art, the transition piece is omitted, the risk of short circuit is reduced, and the overall volume is reduced; and because the first terminal 29, the second terminal 30, the third terminal 31, the fourth connecting section 26, the fifth connecting section 27 and the sixth connecting section 28 are all parallel to the first direction, sufficient welding area is guaranteed, loose welding is avoided, and the risk is reduced.

[0043] The busbar structure further includes a neutral point connecting piece 32, the neutral point connecting piece 32 has a seventh connecting section 33, which is parallel to the second direction and fixedly arranged inside the mounting body 10, and the neutral point connecting piece 32 also has three eighth connecting sections 34, the three eighth connecting sections 34 are all parallel to the second direction and are evenly distributed in the length direction of the seventh connecting section 33, and are fixedly connected to the seventh connecting section 33, and one end of the eighth connecting section 34 extends to the outside of the mounting body 10 and is fixedly connected to a fourth locking buckle 35; Further, the seventh connecting section 33 has a first side wall and a second side wall opposite to each other in the first direction, and the first side wall is provided with eight protrusions 36, which are evenly divided into two groups and symmetrically arranged on the first side wall, and the second side wall is provided with eight recessed portions 37, which are arranged one by one with the eight recessed portions 37 and the eight protrusions 36; Thus, the protrusion 36 and the recess 37 can ensure that the neutral point connecting piece 32 and the installation body 10 are firmly connected, and the neutral point connecting piece 32 is prevented from moving out of the installation body 10; Optionally, the recessed portion 37 and the raised portion 36 are formed by stamping; the seventh connecting segment 33, the eighth connecting segment 34 and the fourth locking buckle 35 are formed in one piece.

[0044] The first lock buckle 23, the second lock buckle 24, the third lock buckle 25 and the fourth lock buckle 35 all have a first clamping jaw and a second clamping jaw, and a clamping space is formed between the first clamping jaw and the second clamping jaw for clamping the enameled wire; The first lock buckle 23, the second lock buckle 24, the third lock buckle 25 and the fourth lock buckle 35 are all fixedly connected with a welding plate 38 parallel to the first direction for welding with the enameled wire; On the production line, the enameled wire is placed in the clamping space, and the external manipulator structure clamps the first clamp and the second clamp, so that the first clamp and the second clamp clamp the enameled wire, and then the current is released through the external welding part. The current passes through the enameled wire and the welding plate to melt the enameled wire and the welding plate, ensuring that the welding is firm. At the same time, no manual intervention is required, saving manpower; Compared with the prior art, Fig.13 , the enameled wire needs to be manually pressed into the bending portion 44, and then the current is released through the external welding part to weld the enameled wire and the bending portion 44, but part of the current will flow directly through the bending portion 44, and another part of the current will flow through the enameled wire, which may easily lead to unstable welding.

[0045] like Figure 7 , Fig.11 As shown, the interlocking structure includes 12 connecting members 39, and the 12 connecting members 39 are evenly arranged on the outer wall of the installation body 10 in the circumferential direction. The connecting members 39 include a ninth connecting segment 40 and a tenth connecting segment 41. The ninth connecting segment 40 is parallel to the second direction, and one end thereof is fixedly connected to the installation body 10, and the other end extends in a direction away from the installation body 10. The tenth connecting segment 41 is parallel to the first direction, and one end thereof is fixedly connected to an end of the ninth connecting segment 40 away from the installation body 10. A reinforcing rib 45 is arranged between the ninth connecting segment 40 and the tenth connecting segment 41. The tenth connecting segment 41 has a third side wall close to the ninth connecting segment 40, and a slider 42 parallel to the first direction is arranged on the third side wall, and a locking portion 49 is arranged at an end of the third side wall away from the ninth connecting segment 40. like Fig.12 As shown, the interlocking structure further includes a slide groove 47 and a locking groove 48. The slide groove 47 is provided on the insulating frame 46 and matches with the slider 42. The locking groove 48 is provided on the insulating frame 46 and matches with the locking portion 49. By moving the busbar assembly closer to the insulating frame 46, the slider 42 enters the slide groove 47 and moves along the slide groove 47 until the locking portion 49 finally enters the locking groove 48, thereby achieving interlocking and ensuring a tight connection; It should be noted that there are two slide grooves 47 and three locking grooves 48. When the bus assembly is moved close to the insulating frame 46, according to the actual structure, that is, the distance between two adjacent connecting parts 39, the slider 42 can enter one of the slide grooves 47, and correspondingly, the locking part 49 enters the two locking grooves 48 adjacent to the slide groove 47, thereby improving the adaptability and being able to assemble bus assemblies of different specifications.

[0046] The mounting body 10 is provided with identification marks corresponding to the two sets of busbar structures; Specifically, the first busbar 17, the second busbar 18 and the third busbar 19 of one group of busbar structures are represented by U1, V1 and W1 respectively, and the first busbar 17, the second busbar 18 and the third busbar 19 of the group of busbar structures are respectively provided with U1, V1 and W1 identification marks on the mounting body 10, and the first terminal 29, the second terminal 30 and the third terminal 31 respectively welded to the first busbar 17, the second busbar 18 and the third busbar 19 of the group of busbar structures are respectively provided with U1, V1 and W1 identification marks; The first busbar 17, the second busbar 18 and the third busbar 19 of another busbar structure are represented by U2, V2 and W2 respectively. U2, V2 and W2 identification marks are respectively set on the mounting body 10 corresponding to the first busbar 17, the second busbar 18 and the third busbar 19 of the busbar structure of the group. At the same time, U2, V2 and W2 identification marks are respectively set for the first terminal 29, the second terminal 30 and the third terminal 31 respectively welded to the first busbar 17, the second busbar 18 and the third busbar 19 of the busbar structure of the group. By setting identification marks, errors and fool-proofing can be prevented during assembly. When producing and installing the bus on the production line, the positions of the first bus 17, the second bus 18 and the third bus 19 can be automatically identified to achieve correct installation, avoid installation errors and reduce production costs.

[0047] Working principle: The fan 12 is driven to rotate by the rotation of the rotor assembly, so that airflow is formed in the motor housing 2. The airflow takes away the heat of the motor body 1 during operation and exchanges heat with the motor housing 2. The heat is transferred to the heat dissipation ribs 11 for heat dissipation, thereby ensuring that the internal temperature of the motor housing 2 is quickly reduced and the risk of damage to the motor body 1 is reduced; By means of the first connecting section 20, the second connecting section 21 and the third connecting section 22 which are parallel to the second direction, and the fourth connecting section 26, the fifth connecting section 27 and the sixth connecting section 28 which are parallel to the first direction, the structures of the first busbar 17, the second busbar 18 and the third busbar 19 are distributed in two perpendicular directions, thereby reducing the volume. In addition, the first terminal 29, the second terminal 30 and the third terminal 31 are all parallel to the first direction, thereby ensuring that the fourth connecting section 26 and the first terminal 29, the fifth connecting section 27 and the second terminal 30, and the sixth connecting section 28 and the third terminal 31 are firmly welded, thereby increasing the contact area and avoiding the risk of short circuit. Through the clamping space between the first clamping jaw and the second clamping jaw, and the welding plate 38, the welding firmness of the enameled wire can be ensured, and the production can be automatically carried out on the production line, saving labor. At the same time, the identification mark can be automatically identified during production to avoid errors. By providing an anti-demagnetization structure on the mounting slot of the rotor core 8, demagnetization of the magnetic steel is avoided; By designing a slender rotor, the rotor's rotational inertia moment is reduced, the response speed of the steering system is improved, and the reliability of the steering system is increased.

[0048] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. EPS power steering motor, characterized in that: include: A motor body (1), the motor body (1) comprising a motor housing (2), an outer wall of which is provided with a heat dissipation structure; A stator assembly, the stator assembly being arranged inside the motor housing (2), comprising a stator core (3) and a winding (4) composed of enameled wires arranged inside the stator core (3), an insulating frame (46) being arranged between the stator core (3) and the winding (4); A rotor assembly, the rotor assembly being coaxially and rotatably arranged inside the stator core (3), the rotor assembly comprising a rotating shaft (6), one end of which rotatably penetrates the motor housing (2) and extends to the outside of the motor housing (2), and is coaxially interference-connected with a gear (7); The rotor assembly also includes a rotor core (8), a plurality of mounting grooves being evenly formed on the circumferential side wall thereof, magnetic steel (9) being disposed in the mounting grooves, and an anti-demagnetization structure being disposed on the mounting grooves to prevent the magnetic steel (9) from being demagnetized; A busbar assembly, wherein the busbar assembly is connected to the insulating frame (46) via an interlocking structure, the busbar assembly comprises a mounting body (10), a busbar structure and a terminal structure, wherein the terminal structure and the busbar structure are welded together, and the busbar structure and the winding (4) are welded together, and the busbar assembly is an integrated structure.

2. The EPS power steering motor according to claim 1, characterized in that: The heat dissipation structure comprises a plurality of heat dissipation ribs (11), each of the plurality of heat dissipation ribs (11) being annular structures and evenly distributed on the outer wall of the motor housing (2) along a first direction.

3. The EPS power steering motor according to claim 1, characterized in that: The rotor assembly further comprises a fan (12), which is coaxially fixedly sleeved on the rotating shaft (6) and is located inside the motor housing (2); the fan (12) rotates to form a wind flow, and blows the wind flow toward the inner wall of the motor housing (2); the fan (12) has a plurality of blades, the number of the blades being an odd number; and a weight-reducing hole (13) is also provided through the rotor core (8) along a first direction; The portion of the rotating shaft (6) located on the motor housing (2) comprises a mounting section, a knurled portion (14) is provided on a circumferential side wall of the mounting section, and the gear (7) is interference-fitted on the knurled portion (14).

4. The EPS power steering motor according to claim 1, characterized in that: A bearing chamber is provided on an inner wall of one side in a first direction inside the motor housing (2), the bearing (15) is arranged in the bearing chamber, the outer ring of the bearing (15) is chamfered, the bearing chamber and the outer ring of the bearing (15) are matched, and are used to axially limit the bearing (15); The anti-demagnetization structure comprises a groove (16), and the grooves (16) are provided at the bottoms of both ends of the installation groove.

5. The EPS power steering motor according to claim 1, characterized in that: The busbar structure comprises a first busbar (17), a second busbar (18) and a third busbar (19); the first busbar (17), the second busbar (18) and the third busbar (19) are all fixedly arranged inside the mounting body (10); and the first busbar (17), the second busbar (18) and the third busbar (19) respectively have a first connecting section (20), a second connecting section (21) and a third connecting section (22) parallel to a second direction; one end of the first connecting section (20) extends to the outside of the mounting body (10) and is fixedly connected to a first locking buckle (23); one end of the second connecting section (21) extends to the outside of the mounting body (10) and is fixedly connected to a second locking buckle (24); and one end of the third connecting section (22) extends to the outside of the mounting body (10) and is fixedly connected to a third locking buckle (25); the second direction is perpendicular to the first direction.

6. The EPS power steering motor according to claim 5, characterized in that: The first busbar (17), the second busbar (18) and the third busbar (19) further have a fourth connecting segment (26), a fifth connecting segment (27) and a sixth connecting segment (28) respectively parallel to the first direction; the fourth connecting segment (26) is fixedly connected to an end of the first connecting segment (20) away from the first locking buckle (23); the fifth connecting segment (27) is fixedly connected to an end of the second connecting segment (21) away from the second locking buckle (24); and the sixth connecting segment (28) is fixedly connected to an end of the third connecting segment (22) away from the third locking buckle (25).

7. The EPS power steering motor according to claim 6, characterized in that: The terminal structure comprises a first terminal (29), a second terminal (30) and a third terminal (31) parallel to the first direction; one end of the first terminal (29) extends into the interior of the mounting body (10) and is welded to an end of the fourth connecting section (26) away from the first connecting section (20); one end of the second terminal (30) extends into the interior of the mounting body (10) and is welded to an end of the fifth connecting section (27) away from the second connecting section (21); and one end of the third terminal (31) extends into the interior of the mounting body (10) and is welded to an end of the sixth connecting section (28) away from the third connecting section (22).

8. The EPS power steering motor according to claim 7, characterized in that: The busbar structure further comprises a neutral point connecting piece (32), which has a seventh connecting section (33) fixedly arranged inside the mounting body (10) and parallel to the second direction, three eighth connecting sections (34) parallel to the second direction are evenly distributed on one side of the first connecting section (20), one end of the eighth connecting section (34) away from the seventh connecting section (33) extends to the outside of the mounting body (10) and is fixedly connected to a fourth locking buckle (35); The seventh connecting section (33) is provided with a plurality of protrusions (36) and a plurality of recesses (37) on two opposite side walls in the first direction, respectively, and the plurality of protrusions (36) and the plurality of recesses (37) correspond one to one.

9. The EPS power steering motor according to claim 8, characterized in that: The first lock buckle (23), the second lock buckle (24), the third lock buckle (25) and the fourth lock buckle (35) all comprise a first clamping jaw and a second clamping jaw, a clamping space is formed between the first clamping jaw and the second clamping jaw for clamping the enameled wire, and the first lock buckle (23), the second lock buckle (24), the third lock buckle (25) and the fourth lock buckle (35) are all provided with a welding plate (38) parallel to the first direction for welding with the enameled wire.

10. The EPS power steering motor according to claim 1, characterized in that: The interlocking structure comprises a plurality of connecting members (39), the plurality of connecting members (39) being evenly arranged in the circumferential direction of the mounting body (10), the connecting member (39) comprising a ninth connecting segment (40) parallel to the second direction and a tenth connecting segment (41) parallel to the first direction fixedly connected to an end of the ninth connecting segment (40) away from the mounting body (10), the tenth connecting segment (41) being provided with a sliding block (42) extending along its length direction, and an end of the tenth connecting segment (41) away from the ninth connecting segment (40) being provided with a locking portion (49); The interlocking structure further comprises a sliding groove (47) and a locking groove (48), which are arranged on the insulating frame (46) and are compatible with the sliding block (42); the locking groove (48) is arranged on the insulating frame (46) and is compatible with the locking portion (49); The mounting body (10) is provided with identification marks corresponding to the first busbar (17), the second busbar (18) and the third busbar (19).

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