CN220172943U

CN220172943U - Hub motor for electric vehicle

Info

Publication number: CN220172943U
Application number: CN202321475319.0U
Authority: CN
Inventors: 唐敏; 王加许; 王健
Original assignee: TAIZHOU JINYU ELECTROMECHANICAL CO Ltd
Current assignee: TAIZHOU JINYU ELECTROMECHANICAL CO Ltd
Priority date: 2023-06-09
Filing date: 2023-06-09
Publication date: 2023-12-12
Anticipated expiration: 2033-06-09

Abstract

The utility model relates to an electric vehicle hub motor, which comprises a stator and a rotor, wherein the stator comprises a stator core, the stator core comprises a stator ring, the rotor comprises a magnetic conduction ring, the magnetic conduction ring is sleeved on the outer side of the stator, the hub motor further comprises a connecting structure, the magnetic conduction ring comprises a middle part, the connecting structure is positioned at the end part of the middle part, a plurality of first mounting holes are formed in the end part of the connecting structure, and the first mounting holes are positioned at the inner side of a curved surface where the inner peripheral surface of the stator ring is positioned. Compared with the prior art, the first mounting hole is positioned on the first fixing part, so that the limit that the wall thickness of the magnetic conduction ring is required to be larger than the aperture of the threaded hole is effectively avoided, the radial wall thickness of the magnetic conduction ring is reduced, and weight reduction is realized; the connecting structure is used for avoiding the winding, so that the screw in the first mounting hole is positioned at the inner side of the curved surface where the inner peripheral surface of the stator ring is positioned, and interference with the winding or the stator ring during mounting of the screw is prevented.

Description

Hub motor for electric vehicle

Technical Field

The utility model relates to a hub motor for an electric vehicle, and belongs to the technical field of hub motors.

Background

The electric vehicle has the characteristics of light travel, low carbon, environmental protection, energy conservation, safety, reliability, stable performance and the like, and is widely applied to daily life traffic. Along with the gradual standardization of national policies, the requirements of new national standard electric vehicles are increased gradually, and the weight of the whole vehicle is strictly limited by the compliant electric vehicles, so that the pursuit of the weight reduction of the whole vehicle becomes a design target of vast new national standard electric vehicle manufacturers. In contrast, the weight of the hub motor, which is a core component of the electric vehicle, occupies a small share in the whole vehicle weight, and therefore, a higher requirement is put on the weight reduction of the hub motor of the electric vehicle.

In the prior art, a hub motor for an electric vehicle comprises a stator and a rotor, wherein the rotor is sleeved outside the stator, the rotor comprises a rim, a magnetic conduction ring and a permanent magnet, the magnetic conduction ring is fixed inside the rim, and a plurality of threaded holes for installing end covers are respectively formed in two end faces of the magnetic conduction ring. At present, the magnetic ring of the motor rotor is a straight cylinder type columnar ring body formed by rolling plates with uniform wall thickness, in order to facilitate the processing of threaded holes on two end surfaces of the magnetic ring, the wall thickness of the magnetic ring is required to be larger than the diameter of a fixed screw, and the wall thickness of the conventional magnetic ring is 7mm. The excessive magnetic circuit of the magnetic conduction ring cannot be thinned due to the requirement of a fixed structure, and the weight of the magnetic conduction ring is heavy, so that the material is wasted; the whole weight of the hub motor is high, the rolling resistance of the tire is increased, and the energy consumption is high.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art and provides an electric vehicle hub motor for reducing the radial wall thickness of a magnetic conduction ring.

The technical scheme adopted for realizing the purpose is as follows:

the utility model provides an electric motor car in-wheel motor, includes stator and rotor, the stator includes stator core, stator core includes the stator ring, the rotor includes the magnetic conduction ring, the magnetic conduction ring cover is established the outside of stator still includes connection structure, the magnetic conduction ring includes the intermediate part, connection structure is located the tip of intermediate part, connection structure's tip is equipped with a plurality of first mounting holes, first mounting hole is located the inboard of stator intra-annular global place curved surface.

As a further optimization of the above technical solution: the end part of the connecting structure is provided with a first fixing part which is radially arranged, and a plurality of first mounting holes are formed in the first fixing part.

As a further optimization of the above technical solution: the end part of the middle part, which is far away from the connecting structure, is provided with a second fixing part, and a plurality of second mounting holes are formed in the second fixing part.

As a further optimization of the above technical solution: the second mounting hole is positioned on the outer side of the outer peripheral surface of the middle part, and the second fixing part is formed by turning out the end part of the middle part along the radial direction.

As a further optimization of the above technical solution: the pore walls of the first mounting hole and the second mounting hole are connected with extension walls, and the extension walls are positioned on the side surfaces of the first fixing part and the second fixing part, which are close to the middle part.

As a further optimization of the above technical solution: the magnetic ring is characterized by further comprising a first end cover and a second end cover which are positioned on two sides of the magnetic ring, wherein the radial dimension of the first end cover is smaller than that of the second end cover, the end part of the screw penetrates through the first end cover and is fixed in the first mounting hole, and the end part of the screw penetrates through the second end cover and is fixed in the second mounting hole.

As a further optimization of the above technical solution: the wall thickness of the magnetic conduction ring is 2mm-5 mm.

As a further optimization of the above technical solution: the connecting structure comprises a first inclined plane connected with the end part of the middle part, a second inclined plane connected with the first fixing part and a first connecting plate connected with the first inclined plane and the second inclined plane, and the first connecting plate is radially arranged.

As a further optimization of the above technical solution: the connecting structure comprises a third inclined surface connected with the end part of the middle part and a second connecting plate connected with the third inclined surface, the second connecting plate is radially arranged, and the first fixing part is formed by the radial extension of the second connecting plate.

As a further optimization of the above technical solution: the connecting structure comprises a third connecting plate, the third connecting plate comprises a first connecting bottom plate and first connecting side plates, the first connecting bottom plate is arranged in the radial direction, the first connecting side plates are arranged at two ends of the first connecting bottom plate in the axial direction, the third connecting plate is approximately U-shaped, the opening of the third connecting plate faces the middle part, the end part of the first connecting side plate is turned out in the radial direction and is connected with the end part of the middle part, and the first fixing part is formed by turning out the end part of the first connecting side plates in the radial direction.

As a further optimization of the above technical solution: the connecting structure is arc-shaped, and an opening of the connecting structure faces the middle part.

As a further optimization of the above technical solution: the connecting structure comprises a fourth inclined plane connected with the end part of the middle part and a fifth inclined plane connected with the fourth inclined plane, an included angle between the fourth inclined plane and the fifth inclined plane is 90-170 degrees, and the first fixing part is connected with the fifth inclined plane.

As a further optimization of the above technical solution: the connecting structure comprises a second connecting bottom plate and second connecting side plates, wherein the second connecting bottom plate is radially arranged, the second connecting side plates are axially arranged and located at two ends of the second connecting bottom plate, the connecting structure is approximately U-shaped, an opening of the connecting structure faces the middle portion, the second connecting side plates are axially extended from the end portions of the middle portion, and the first fixing portions are formed by the end portions of the second connecting side plates being turned inwards in a radial mode.

As a further optimization of the above technical solution: the connecting structure comprises a third connecting bottom plate, a third connecting side plate and a fourth connecting side plate, wherein the third connecting bottom plate is arranged in the radial direction, the third connecting side plate is positioned at two ends of the third connecting bottom plate, the third connecting side plate is formed by axially extending the end part of the middle part, the fourth connecting side plate is arranged in an inclined mode, and the first fixing part is connected with the fourth connecting side plate.

Compared with the prior art, the first mounting hole is positioned on the first fixing part, the second mounting hole is positioned on the second fixing part, and the limit that the wall thickness of the magnetic conduction ring is required to be larger than the aperture of the threaded hole is effectively avoided, so that the radial wall thickness of the magnetic conduction ring is reduced, the weight is reduced, the materials are saved, the cost is reduced, and the motor is light; the space occupied by the stator is increased, the driving force arm of the hub motor is enlarged by increasing the outer diameter of the stator, the power density and overload capacity of the motor are improved, and the energy consumption is reduced; the connecting structure is used for avoiding the winding, so that the screw in the first mounting hole is positioned at the inner side of the curved surface where the inner peripheral surface of the stator ring is positioned, interference between the screw and the winding or the stator ring is prevented during mounting, the axial size of the magnetic conduction ring is shortened, the radial size of the first end cover is reduced, and the cost is saved.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional structure of a first embodiment of the present utility model.

Fig. 3 is a schematic cross-sectional view of a magnetic ring and a rim according to a first embodiment of the present utility model.

Fig. 4 is a schematic cross-sectional view of a magnetic ring and a rim according to a second embodiment of the present utility model.

Fig. 5 is a schematic cross-sectional view of a magnetic ring and a rim according to a third embodiment of the present utility model.

Fig. 6 is a schematic cross-sectional view of a magnetic ring and a rim according to a fourth embodiment of the present utility model.

Fig. 7 is a schematic cross-sectional view of a magnetically permeable ring and rim in a fifth embodiment of the utility model.

Fig. 8 is a schematic cross-sectional view of a magnetic ring and a rim in a sixth embodiment of the utility model.

Fig. 9 is a schematic cross-sectional view of a magnetically permeable ring and a rim in a seventh embodiment of the utility model.

Detailed Description

The utility model is further described below with reference to the drawings and the detailed description.

First embodiment:

as shown in fig. 1 to 3, a hub motor for an electric vehicle comprises a stator, a rotor and a motor shaft 11, wherein the stator comprises a stator core 10 and a winding 1, the stator core 10 comprises a stator ring, a plurality of stator teeth radially distributed on the outer peripheral surface of the stator ring and a bracket 101 positioned on the inner peripheral surface of the stator ring, and the winding 1 is wound on the stator teeth. The center of the bracket 101 is provided with a motor shaft hole, and the motor shaft 11 is arranged in the motor shaft hole in a penetrating way. The rotor comprises a magnetic conduction ring 2, and the magnetic conduction ring 2 is sleeved on the outer side of the stator.

The technical scheme is as follows: the magnetic conduction ring 2 comprises a middle part, and two ends of the middle part are respectively provided with a second fixing part 5 and a connecting structure 3. The end of the connecting structure 3 is provided with a radially arranged first fixing portion 4. The first fixing portion 4 is provided with a plurality of first mounting holes 41, and the first mounting holes 41 are located on the inner side of the curved surface where the inner circumferential surface of the stator ring is located. The connection structure 3 serves as a bypass winding. The second fixing part 5 is provided with a plurality of second mounting holes 51, the second mounting holes 51 are positioned on the outer side of the outer peripheral surface of the middle part, and the second fixing part 5 is formed by turning out the end part of the middle part along the radial direction. The middle part, the connecting structure 3, the first fixing part 4 and the second fixing part 5 are integrally formed. The connecting structures 3 may be provided at both ends of the intermediate portion.

The walls of the first mounting hole 41 and the second mounting hole 51 are connected with an extension wall 12, and the extension wall 12 is positioned on the side surface of the first fixing part 4 and the second fixing part 5, which is close to the middle part. Taking the processing mode of the first mounting hole 41 as an example, the first mounting hole 41 is formed by the first fixing portion 4 through a puncturing process, the puncturing process enables the first fixing portion 4 to achieve the purpose of flanging, and the first mounting hole 41 and the extension wall 12 are formed at one time; the first mounting hole 41 may be formed by punching a pre-punched hole from the first fixing portion 4, the pre-punched hole having a smaller diameter than the first mounting hole 41, and then flanging the pre-punched hole by a flanging process, whereby the pre-punched hole is folded along the axial direction in a direction approaching the middle portion by means of the tensile deformation of the first fixing portion 4, thereby forming the first fixing portion 4 and the extension walls 12 located on both sides of the first fixing portion 4.

The technical scheme is as follows: the rotor also comprises a rim 6 and permanent magnets 7, the outer peripheral surface of the magnetic conduction ring 2 is fixed on the rim 6, a plurality of permanent magnets 7 are attached to the inner peripheral surface of the magnetic conduction ring 2, and the magnetic conduction ring 2 is sleeved on the outer side of the stator. Also included are a first end cap 8 and a second end cap 9, the radial dimension of the first end cap 8 being smaller than the radial dimension of the second end cap 9. The end of the screw passes through the first end cap 8 and is fixed in the first mounting hole 41, thereby fixing the first end cap 8 on the first fixing portion 4; the end of the screw passes through the second end cap 9 and is fixed in the second mounting hole 51, thereby fixing the second end cap 9 to the second fixing portion 5. The first mounting hole 41 is located on the inner side of the curved surface where the inner circumferential surface of the stator ring is located, and the second mounting hole 51 is located on the outer side of the outer circumferential surface of the middle portion, so that interference with the winding 1 or the stator ring during screw mounting is effectively prevented.

The first mounting hole 41 is positioned on the first fixing part 4, the second mounting hole 51 is positioned on the second fixing part 5, and the limitation that the wall thickness of the magnetic conduction ring is larger than the aperture of the threaded hole is effectively avoided, so that the radial wall thickness of the magnetic conduction ring is reduced, the weight is reduced, the materials are saved, the cost is reduced, and the motor is light; and the space occupied by the stator is increased, the driving force arm of the hub motor is enlarged by increasing the outer diameter of the stator, the power density and overload capacity of the motor are improved, and the energy consumption is reduced. The connecting structure 3 is used for avoiding the winding 1, so that the screw in the first mounting hole 41 is positioned at the inner side of the curved surface where the inner peripheral surface of the stator ring is positioned, interference between the screw and the winding 1 or the stator ring is prevented during mounting, the axial size of the magnetic conduction ring 2 is shortened, the radial size of the first end cover 8 is reduced, and the cost is saved.

The technical scheme is as follows: the wall thickness of the magnetic conduction ring is 2mm-5mm, and the wall thickness of the magnetic conduction ring is arranged on the basis of ensuring the installation strength and the magnetic conduction capability, so that the conditions of easy breakage, magnetic leakage and the like of the magnetic conduction ring are prevented.

The technical scheme is as follows: the connection structure 3 includes a first inclined surface 31 connected to an end portion of the intermediate portion, a second inclined surface 32 connected to the first fixing portion 4, and a first connection plate 33 connecting the first inclined surface 31 and the second inclined surface 32, the first connection plate 33 being radially disposed. The first inclined plane 31 and the first connecting plate 33 play a role of avoiding the winding 1, and the axial size of the magnetic conduction ring 2 is shortened; the second inclined plane 32 enables the arrangement of the first fixing part 4 to reasonably utilize the space inside the winding 1, so that the overall shape of the magnetic conduction ring 2 is more attractive.

Second embodiment:

the technical solution in this embodiment is basically the same as that of the first embodiment, except that, as shown in fig. 4, the connection structure 3 includes a third inclined surface 34 connected to an end portion of the middle portion, and a second connection plate 35 connected to the third inclined surface 34, the second connection plate 35 is radially disposed, and the first fixing portion 4 is formed by radially extending the second connection plate 35.

Third embodiment:

the technical solution in this embodiment is basically the same as that of the first embodiment, except that, as shown in fig. 5, the connection structure 3 includes a third connection plate 36, where the third connection plate 36 includes a first connection bottom plate disposed radially and first connection side plates disposed axially and located at two ends of the first connection bottom plate, and the third connection plate 36 approximates a U-shape. The third connecting plate 36 opens toward the middle. The end of the first connecting side plate is turned out radially outwards and is connected with the end of the middle part, and the first fixing part 4 is formed by turning out the end of the first connecting side plate radially inwards.

Fourth embodiment:

the technical solution in this embodiment is basically the same as that of the first embodiment, except that, as shown in fig. 6, the connection structure 3 is arc-shaped, and the opening of the connection structure 3 faces the middle portion.

Fifth embodiment:

the technical solution in this embodiment is basically the same as that of the first embodiment, except that, as shown in fig. 7, the connection structure 3 includes a fourth inclined surface 37 connected to an end portion of the intermediate portion and a fifth inclined surface 38 connected to the fourth inclined surface. The included angle between the fourth inclined surface 37 and the fifth inclined surface 38 is 90-170 degrees. The first fixing portion 4 and the fifth inclined surface 38 are connected.

Sixth embodiment:

the technical solution in this embodiment is basically the same as that of the first embodiment, except that, as shown in fig. 8, the connection structure 3 includes a radially disposed second connection bottom plate 39 and axially disposed second connection side plates located at both ends of the second connection bottom plate 39, and the connection structure 3 is approximately U-shaped. The opening of the connecting structure 3 is directed towards the middle. The second connecting side plate is connected with the end part of the middle part, and the first fixing part 4 is formed by turning out the end part of the second connecting side plate inwards in the radial direction.

Seventh embodiment:

the technical solution in this embodiment is basically the same as that of the first embodiment, except that, as shown in fig. 9, the connection structure 3 includes a third connection bottom plate and third and fourth connection side plates 310 located at both ends of the third connection bottom plate, which are radially disposed. The third connecting side plate is formed by axially extending the end part of the middle part. The fourth connecting side plate 310 is disposed obliquely, and the first fixing portion 4 and the fourth connecting side plate 310 are connected. The fourth connecting side plate 310 which is obliquely arranged reduces the occupied space of the connecting structure 3, so that the overall shape of the magnetic conduction ring 2 is more attractive.

The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical schemes which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the technical personnel in the field according to the conception of the utility model are within the protection scope of the utility model.

Claims

1. The utility model provides an electric motor car in-wheel motor, includes stator and rotor, the stator includes stator core (10), stator core (10) include the stator ring, the rotor includes magnetic ring (2), magnetic ring (2) cover are established the outside of stator, its characterized in that still includes connection structure (3), magnetic ring (2) include the middle part, connection structure (3) are located the tip of middle part, the tip of connection structure (3) is equipped with a plurality of first mounting holes (41), first mounting hole (41) are located the inboard of stator inner peripheral face place curved surface.

2. The hub motor for an electric vehicle according to claim 1, wherein the end portion of the connecting structure (3) is provided with a first fixing portion (4) radially arranged, and a plurality of the first mounting holes (41) are located on the first fixing portion (4).

3. The hub motor for the electric vehicle according to claim 2, wherein a second fixing portion (5) is provided at an end portion of the intermediate portion away from the connecting structure (3), and a plurality of second mounting holes (51) are formed in the second fixing portion (5).

4. A hub motor for an electric vehicle according to claim 3, wherein said second mounting hole (51) is located outside the outer peripheral surface of said intermediate portion, and said second fixing portion (5) is formed by turning out the end portion of said intermediate portion in a radial direction.

5. A hub motor for an electric vehicle according to claim 3, characterized in that the walls of the first mounting hole (41) and the second mounting hole (51) are connected with an extension wall (12), and the extension wall (12) is located on the side of the first fixing portion (4) and the second fixing portion (5) close to the middle portion.

6. A hub motor for an electric vehicle according to claim 3, further comprising a first end cap (8) and a second end cap (9) disposed on both sides of the magnetically permeable ring (2), wherein the radial dimension of the first end cap (8) is smaller than the radial dimension of the second end cap (9), the end of the screw passes through the first end cap (8) and is fixed in the first mounting hole (41), and the end of the screw passes through the second end cap (9) and is fixed in the second mounting hole (51).

7. An electric hub motor according to claim 2, characterized in that the wall thickness of the magnetically permeable ring (2) is 2mm-5 mm.

8. An electric vehicle hub motor according to any one of claims 2-7, characterized in that the connection structure (3) comprises a first inclined surface (31) connected to an end portion of the intermediate portion, a second inclined surface (32) connected to the first fixing portion (4), and a first connection plate (33) connecting the first inclined surface (31) and the second inclined surface (32), the first connection plate (33) being radially disposed.

9. An electric vehicle hub motor according to any one of claims 2-7, characterized in that the connection structure (3) comprises a third inclined surface (34) connected to an end portion of the intermediate portion, and a second connection plate (35) connected to the third inclined surface (34), the second connection plate (35) being radially arranged, and the first fixing portion (4) being formed by the radial extension of the second connection plate (35).

10. An electric vehicle hub motor according to any of claims 2-7, characterized in that the connection structure (3) comprises a third connection plate (36), the third connection plate (36) comprises a first connection bottom plate arranged radially and first connection side plates arranged axially at two ends of the first connection bottom plate, the third connection plate (36) is approximately U-shaped, the opening of the third connection plate (36) faces the middle part, the end parts of the first connection side plates are turned out radially outwards and are connected with the end parts of the middle part, and the first fixing part (4) is formed by turning out the end parts of the first connection side plates radially inwards.

11. An electric vehicle hub motor according to any one of claims 2-7, characterized in that the connection structure (3) is arc-shaped, the opening of the connection structure (3) being directed towards the intermediate portion.

12. An electric vehicle hub motor according to any one of claims 2-7, characterized in that the connection structure (3) comprises a fourth inclined surface (37) connected to an end portion of the intermediate portion and a fifth inclined surface (38) connected to the fourth inclined surface (37), an included angle between the fourth inclined surface (37) and the fifth inclined surface (38) is 90 ° to 170 °, and the first fixing portion (4) and the fifth inclined surface (38) are connected.

13. An electric vehicle hub motor according to any one of claims 2-7, characterized in that the connection structure (3) comprises a radially arranged second connection bottom plate (39) and axially arranged second connection side plates at both ends of the second connection bottom plate (39), the connection structure (3) is approximately U-shaped, the opening of the connection structure (3) faces the middle part, the second connection side plates are formed by axially extending the ends of the middle part, and the first fixing parts (4) are formed by radially inwardly turning the ends of the second connection side plates.

14. An electric vehicle hub motor according to any one of claims 2-7, wherein the connection structure (3) comprises a third connection bottom plate arranged radially, and a third connection side plate and a fourth connection side plate (310) arranged at two ends of the third connection bottom plate, the third connection side plate is formed by axially extending an end portion of the middle portion, the fourth connection side plate (310) is arranged obliquely, and the first fixing portion (4) and the fourth connection side plate (310) are connected.