CN112701822A

CN112701822A - In-wheel motor

Info

Publication number: CN112701822A
Application number: CN202011632722.0A
Authority: CN
Inventors: 高超; 林彦; 陈正平; 夏正朋; 周广玉
Original assignee: Shanghai Yadi Information Technology Co ltd
Current assignee: Shanghai Yadi Information Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-04-23

Abstract

The invention belongs to the field of electric vehicle manufacturing, and discloses a hub motor. The wheel hub motor includes the motor shaft, sets up stator, wheel hub body and the rotor on the motor shaft, and the motor shaft rotates and wears to locate the wheel hub body, and the stator sets up in wheel hub body, and it is protruding to be equipped with a plurality of first blocks along wheel hub body inner wall circumference interval, and the rotor includes a plurality of silicon steel blocks and a plurality of magnet steel, and a plurality of silicon steel blocks one-to-one joint are protruding in a plurality of first blocks, and the magnet steel sets up between two adjacent silicon steel blocks. Through set up a plurality of first blocks protrudingly on the wheel hub body, make a plurality of silicons steel bloom one-to-one joints protruding in first block, realize the joint of rotor and wheel hub body, first block is protruding to be provided with a plurality ofly along the inner wall circumference interval of wheel hub body moreover, and increase joint effect has prevented coming off of silicons steel bloom.

Description

In-wheel motor

Technical Field

The invention relates to the field of electric vehicle manufacturing, in particular to a hub motor.

Background

The wheel hub motor is a motor arranged in a wheel, and the wheel hub motor is characterized in that power, transmission and braking devices are integrated into a wheel hub, so that the mechanical part of an electric vehicle is greatly simplified. The hub motor comprises a hub body, a rotor core fixedly mounted on the hub body, a stator core matched with the rotor core and a motor shaft, wherein the stator core is connected with the motor shaft through a core support.

The rotor iron core comprises silicon steel blocks and magnetic steel which are arranged in a circular mode, and the magnetic steel is clamped between every two adjacent silicon steel blocks, so that a complete rotor is formed. The silicon steel block and the magnetic steel, and the silicon steel block and the inner edge of the hub body are bonded by glue. The requirement of adhesive bonding is high, the requirement on the production and processing environment of the hub motor is high, the adhesive is not firm, and the rotor is easy to fall off from the hub body.

Disclosure of Invention

The invention aims to provide a hub motor, which enables a silicon steel block to be clamped with a hub body, and has simple structure and convenient assembly and disassembly.

In order to achieve the purpose, the invention adopts the following technical scheme:

an in-wheel motor comprising:

the motor comprises a motor shaft and a stator arranged on the motor shaft;

the motor shaft is rotatably arranged in the hub body in a penetrating mode, the stator is arranged in the hub body, and a plurality of first clamping protrusions are uniformly distributed on the inner peripheral wall of the hub body;

the rotor comprises a plurality of silicon steel blocks and a plurality of magnetic steels, the silicon steel blocks are correspondingly clamped on the first clamping bulges one by one, and one magnetic steel is arranged between every two adjacent silicon steel blocks.

Preferably, a first clamping groove is formed in the silicon steel block, the first clamping protrusion is clamped in the first clamping groove, the first clamping groove is provided with two groove walls, the two groove walls are all obliquely arranged, the distance between the two groove walls is gradually increased along the depth direction of the first clamping groove, and the two groove walls are all abutted to the outer wall of the first clamping protrusion.

Preferably, the silicon steel block comprises an outer surface and an inner surface, the outer surface forms the outer side surface of the rotor, the inner surface forms the inner side surface of the rotor, the outer surface is provided with the first clamping groove, the inner surface is provided with the second clamping protrusion, and the magnetic steel can be abutted against the second clamping protrusion of the adjacent silicon steel block.

Preferably, the silicon steel block has two side walls connecting the outer surface and the inner surface, and the side walls are provided with stress grooves which are arranged close to the inner surface.

Preferably, the first locking protrusion is provided with a wedge-shaped guide portion, and the guide portion is inserted into the first locking groove.

Preferably, one side of the hub body is provided with an annular boss, the annular boss is located on one side of the silicon steel block, and the annular boss abuts against the silicon steel block.

Preferably, an encoder is provided on the motor shaft.

Preferably, the motor further comprises a retaining ring clamped on the motor shaft, one end of the encoder is abutted to the stator, and the other end of the encoder is abutted to the retaining ring.

Preferably, the stator includes a stator slot and a stator tooth, the stator tooth is provided with an outer circumferential surface away from the motor shaft and an inner circumferential surface close to the motor shaft, and the outer circumferential surface and the inner circumferential surface are connected by an arc surface.

Preferably, the silicon steel block is formed by stacking a plurality of silicon steel sheets, fastening points are arranged on the silicon steel sheets, and the adjacent silicon steel sheets are clamped through the fastening points.

The invention has the beneficial effects that:

the invention provides a salient-pole hub motor which comprises a motor shaft, a stator arranged on the motor shaft, a hub body and a rotor, wherein the motor shaft is rotatably arranged on the hub body in a penetrating manner, the stator is arranged in the hub body, a plurality of first clamping protrusions are arranged at intervals and convexly along the circumferential direction of the inner wall of the hub body, the rotor comprises a plurality of silicon steel blocks and a plurality of magnetic steels, the silicon steel blocks are correspondingly clamped in the first clamping protrusions one by one, and the magnetic steels are arranged between two adjacent silicon steel blocks. Through set up a plurality of first blocks protrudingly on the wheel hub body, make a plurality of silicons steel bloom one-to-one joints protruding in first block, realize the joint of rotor and wheel hub body, first block is protruding to be set up along the inner wall circumference interval of wheel hub body moreover, increases the joint effect, has prevented coming off of silicons steel bloom.

Drawings

Fig. 1 is a schematic structural diagram of an in-wheel motor provided in an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic structural diagram of a silicon steel sheet in the hub motor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a hub body in the hub motor provided by the embodiment of the invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at B;

fig. 6 is a schematic view illustrating a state in which an encoder is mounted on a motor shaft in the in-wheel motor according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of an encoder in the hub motor according to the embodiment of the present invention.

In the figure:

1. a hub body; 11. a first snap projection; 111. a guide portion; 12. an annular boss;

2. a rotor; 21. a silicon steel block; 211. a first card slot; 212. a second snap projection; 213. a stress slot; 214. buckling points; 22. magnetic steel;

3. a stator; 31. a stator slot portion; 32. a stator tooth portion;

4. a motor shaft; 41. an iron core support;

5. an encoder; 51. an encoder support; 511. positioning the projection; 52. an encoder circuit board;

6. and a retainer ring.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

The embodiment provides an in-wheel motor, which relates to the field of electric vehicle manufacturing, and is shown in fig. 1 and 2. The in-wheel motor includes motor shaft 4, set up stator 3 on motor shaft 4, wheel hub body 1 and rotor 2, motor shaft 4 rotates and wears to locate wheel hub body 1, stator 3 sets up in wheel hub body 1, along 1 inner wall circumference of wheel hub body interval protruding a plurality of first blocks 11 that are equipped with, rotor 2 includes a plurality of silicon steel pieces 21 and a plurality of magnet steel 22, a plurality of silicon steel pieces 21 one-to-one joint in a plurality of first blocks 11, magnet steel 22 sets up between two adjacent silicon steel pieces 21. Through set up a plurality of first blocks 11 on wheel hub body 1, make a plurality of silicon steel pieces 21 one-to-one joint in first blocks 11, realize rotor 2 and wheel hub body 1's joint, first blocks 11 are provided with a plurality ofly along wheel hub body 1's inner wall circumference interval moreover, have increased the joint effect.

Cogging torque is the torque produced by the interaction between the permanent magnets and the iron core when the permanent magnet motor windings are not energized, and is caused by the tangential component of the interaction force between the permanent magnets and the armature teeth. Specifically, as shown in fig. 2, the stator 3 includes a stator slot portion 31 and a stator tooth portion 32, the stator tooth portion 32 is provided with an outer peripheral surface away from the motor shaft 4 and an inner peripheral surface close to the motor shaft 4, the outer peripheral surface and the inner peripheral surface are connected by an arc surface, and the cogging torque can be effectively reduced by connecting the outer peripheral surface and the inner peripheral surface by the arc surface. Preferably, in the present embodiment, the stator 3 is connected to the motor shaft 4 through the core bracket 41, and the core bracket 41 supports and fixes the stator 3.

Particularly, as shown in fig. 2 and fig. 3, a first engaging groove 211 is disposed on the silicon steel block 21, the first engaging protrusion 11 is engaged with the first engaging groove 211, the first engaging groove 211 has two groove walls, the two groove walls are both inclined, the two groove walls gradually increase in a depth direction of the first engaging groove 211, the two groove walls both abut against the side wall of the first engaging protrusion 11, the groove walls have a limiting effect on the first engaging protrusion 11, and the engaging effect of the first engaging protrusion 11 and the first engaging groove 211 is increased.

Specifically, as shown in fig. 2 and 3, the silicon steel block 21 includes an outer surface and an inner surface, the outer surface forms an outer side surface of the rotor 2, the inner surface forms an inner side surface of the rotor 2, a first engaging groove 211 is provided on the outer surface, a second engaging protrusion 212 is provided on the inner surface, and the magnetic steel 22 can abut against the second engaging protrusion 212 of the adjacent silicon steel block 21. And a second clamping protrusion 212 is arranged for limiting the magnetic steel 22.

Specifically, as shown in fig. 3, the silicon steel block 21 has two sidewalls connecting the outer surface and the inner surface, the sidewalls are provided with stress grooves 213, the stress grooves 213 are disposed near the inner surface, the stress grooves 213 are used to reduce the stress of the silicon steel block 21 and prevent the silicon steel block 21 from deforming at the stress residual position.

Specifically, as shown in fig. 3, the silicon steel block 21 is formed by stacking a plurality of silicon steel sheets, the silicon steel sheets are provided with fastening points 214, and adjacent silicon steel sheets are fastened by the fastening points 214. Preferably, the fastening points 214 are rectangular structures, and when laminating, the fastening points 214 of the upper silicon steel sheet are fastened to the fastening points 214 of the lower silicon steel sheet to form self-fastening, and the silicon steel sheets are fastened in turn to form the silicon steel block 21. The buckling point 214 is convenient in structure and convenient to use, and compared with the existing rivet positioning mode, the positioning precision is higher.

Specifically, as shown in fig. 4 and 5, one side of the hub body 1 is provided with an annular boss 12, the annular boss 12 is located at one side of the silicon steel block 21, the annular boss 12 abuts against the end surface of the silicon steel block 21, and has a limiting effect on the silicon steel block 21 to prevent the silicon steel block 21 from moving along the axial direction of the first snap 11.

Specifically, as shown in fig. 4 and 5, the first catching protrusion 11 is provided with a wedge-shaped guide portion 111, and the guide portion 111 is inserted into the first catching groove 211. The guide portion 111 serves as a guide to facilitate the engagement of the first engaging protrusion 11 and the first engaging groove 211. And the guide part 111 increases the contact area of the first clamping protrusion 11 and the first clamping groove 211, and the clamping effect is enhanced.

Specifically, as shown in fig. 6, an encoder 5 is provided on the motor shaft 4. Preferably, an end cover is arranged on the outer side of the hub body 1, a hub cover is arranged on the inner side of the hub body, the motor shaft 4 is rotatably arranged through the end cover and the hub cover, and a magnetic ring matched with the encoder 5 is arranged on the hub cover. The encoder 5 is used for acquiring the rotating angle of the magnetic ring on the hub cover and transmitting the rotating angle of the magnetic ring to the controller, and the controller calculates and determines the current position and speed of the electric vehicle.

Specifically, as shown in fig. 6 and 7, the in-wheel motor further includes a retaining ring 6 clamped to the motor shaft 4, and one end of the encoder 5 abuts against the stator 3, and the other end abuts against the retaining ring 6. Preferably, encoder 5 includes encoder support 51 and encoder circuit board 52, and encoder support 51 and encoder circuit board 52 all overlap and establish on motor shaft 4, and encoder circuit board 52 sets up on encoder support 51, and encoder support 51 one end and retaining ring 6 butt, the other end passes through encoder circuit board 52 and iron core support 41 butt. With retaining ring 6 butt in encoder 5's terminal surface, retaining ring 6 joint in motor shaft 4 again, has restricted encoder 5 along motor shaft 4's axial displacement, has improved the rate of accuracy of encoder 5 information acquisition. Preferably, a wave-shaped gasket is arranged between the retainer ring 6 and the end face of the encoder 5, and the wave-shaped gasket reduces the abrasion between the encoder 5 and the retainer ring 6. A positioning protrusion 511 is arranged at one end of the encoder support 51 close to the iron core support 41, and the positioning protrusion 511 is clamped in a pin hole in the iron core support 41 to prevent the encoder 5 and the stator 3 from generating relative displacement when rotating.

In the description of the present embodiments, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In this embodiment, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An in-wheel motor, comprising:

a motor shaft (4) and a stator (3) arranged on the motor shaft (4);

the motor shaft (4) is rotatably arranged in the hub body (1) in a penetrating mode, the stator (3) is arranged in the hub body (1), and a plurality of first clamping protrusions (11) are uniformly distributed on the inner peripheral wall of the hub body (1);

rotor (2), rotor (2) include a plurality of silicon steel pieces (21) and a plurality of magnet steel (22), and is a plurality of silicon steel piece (21) one-to-one joint in a plurality of first calorie of protruding (11), adjacent two all be equipped with one between silicon steel piece (21) magnet steel (22).

2. The in-wheel motor according to claim 1, wherein a first locking groove (211) is formed in the silicon steel block (21), the first locking protrusion (11) is locked to the first locking groove (211), the first locking groove (211) has two groove walls, both of the groove walls are disposed in an inclined manner, a distance between the two groove walls is gradually increased along a depth direction of the first locking groove (211), and both of the groove walls abut against an outer wall of the first locking protrusion (11).

3. The in-wheel motor according to claim 2, characterized in that the silicon steel block (21) comprises an outer surface and an inner surface, the outer surface forms an outer side surface of the rotor (2), the inner surface forms an inner side surface of the rotor (2), the outer surface is provided with the first clamping groove (211), the inner surface is provided with the second clamping protrusion (212), and the magnetic steel (22) can abut against the second clamping protrusion (212) of the adjacent silicon steel block (21).

4. The in-wheel motor according to claim 3, wherein the silicon steel block (21) has two side walls connecting the outer surface and the inner surface, the side walls are provided with stress grooves (213), and the stress grooves (213) are arranged near the inner surface.

5. The in-wheel motor according to claim 2, characterized in that a wedge-shaped guide part (111) is arranged on the first clamping protrusion (11), and the guide part (111) is inserted into the first clamping groove (211).

6. The in-wheel motor according to claim 1, characterized in that one side of the hub body (1) is provided with an annular boss (12), the annular boss (12) is located on one side of the silicon steel block (21), and the annular boss (12) abuts against the silicon steel block (21).

7. An in-wheel motor according to claim 1, characterized in that an encoder (5) is arranged on the motor shaft (4).

8. The hub motor according to claim 7, further comprising a retaining ring (6) clamped on the motor shaft (4), wherein one end of the encoder (5) is abutted against the stator (3), and the other end of the encoder is abutted against the retaining ring (6).

9. An in-wheel motor according to any of claims 1-8, characterized in that the stator (3) comprises stator slots (31) and stator teeth (32), the stator teeth (32) are provided with an outer circumferential surface away from the motor shaft (4) and an inner circumferential surface close to the motor shaft (4), and the outer circumferential surface and the inner circumferential surface are connected by an arc surface.

10. The hub motor according to any one of claims 1-8, wherein the silicon steel block (21) is formed by stacking a plurality of silicon steel sheets, fastening points (214) are arranged on the silicon steel sheets, and adjacent silicon steel sheets are clamped by the fastening points (214).