CN115118029A - Hub motor capable of restraining radial electromagnetic force and torque pulsation - Google Patents

Abstract

The invention provides a hub motor capable of inhibiting radial electromagnetic force and torque pulsation, which comprises an inner stator and an outer rotor, wherein a plurality of outer rotor salient poles protruding inwards in the radial direction are arranged on the inner circle of the outer rotor along the circumferential direction; when the inner stator salient pole passes through the outer rotor salient pole groove, the axial clearance between the outer rotor salient pole groove and the inner stator salient pole is smaller than the radial clearance between the rotor salient pole groove and the stator salient pole and smaller than the radial clearance between the rotor salient pole and the stator; the hub motor with the function of inhibiting the radial electromagnetic force and the torque pulsation can reduce the radial electromagnetic force and the torque pulsation after being applied to a vehicle, and meanwhile, the inner stator adopts a separated structure, so that the complex hub switched reluctance motor has the advantages of more convenient structural installation, large design freedom, simple and convenient operation during manufacturing and modification, strong replaceability and capability of effectively reducing the manufacturing cost.

Description

In-wheel motor with suppression of radial electromagnetic force and torque ripple

technical field

The invention belongs to the technical field of motors, and particularly relates to a hub motor capable of suppressing radial electromagnetic force and torque pulsation.

Background technique

In recent years, in-wheel motor drive systems have been continuously promoted and applied in the automotive industry. Switched reluctance motor, as one of the ideal drive motor types for in-wheel motor-driven electric vehicles, has low system cost, stable mechanical structure, reliable power topology and simple control. And the operation efficiency is high, which has received extensive attention in the field of electric vehicle drive motors, but in actual driving, due to road excitation, radial loads cause the air gap eccentricity of the switched reluctance motor, resulting in unbalanced radial electromagnetic force. The vertical vibration of the drive motor affects the ride comfort of the car. On the other hand, the edge magnetic flux effect will be generated before the stator salient poles of the switched reluctance motor overlap with the stator salient poles, which will cause the inductance curve of the motor during unipolar excitation to not change until the rotor turns to the overlapping position of the stator and rotor teeth. Zero, the fringe magnetic flux effect causes the motor to output torque in this area, and the phase current increases in a non-linear trend; the motor output torque also increases in a non-linear trend, causing the motor's external output composite torque to fluctuate at this position.

Torque pulsation caused by fringe flux effect will affect the ride and handling stability of the vehicle. Therefore, reducing the unbalanced radial electromagnetic force and torque pulsation of switched reluctance motors is an urgent need for the development of in-wheel switched reluctance motors.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to overcome the difficulties faced by the above-mentioned in-wheel switched reluctance motor, and propose an in-wheel motor and a vehicle capable of suppressing radial electromagnetic force and torque pulsation. The in-wheel motor with torque ripple can reduce the radial electromagnetic force and torque ripple.

The present invention can be realized through the following technical solutions for the appeal problem:

An in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation, comprising an inner stator and an outer rotor, wherein a plurality of outer rotor salient poles protruding radially inward are arranged on the inner circle of the outer rotor along the circumferential direction, and the inner stator The outer circumference is provided with inner stator salient poles that protrude radially outward, and the outer rotor salient poles are provided with outer rotor salient pole slots for cooperating with the inner stator salient poles; the inner stator salient poles pass through the outer rotor. In the case of salient pole slots, the axial gap between the outer rotor salient pole slot and the inner stator salient pole is smaller than the radial gap between the rotor salient pole slot and the stator salient pole and the radial gap between the rotor salient pole and the stator. gap.

Further, the outer rotor salient poles and the inner stator salient poles are respectively provided with radial pole shoes for suppressing torque pulsation in the rotation overlapping contact direction, and are arranged in the salient pole grooves of the outer rotor salient poles with the inner stator salient poles. The radial slot is used in conjunction with the radial pole piece, and the radial slot is arranged in the opposite direction of rotational contact between the outer rotor salient pole slot and the inner stator salient pole.

Further, the inner stator is a separate structure, the inner stator includes an inner stator salient pole and an inner stator segment root, and the inner stator salient pole passes through the arc part of the salient pole root and the arc depth of the inner stator segment root. The groove parts are snap-connected to form a whole.

Further, it also includes an inner stator shaft for connecting and fixing the inner stator, and the inner stator fixes the segmented roots of the inner stator on the inner stator shaft through the limit plates arranged at both ends of the inner stator.

Further, a sliding key for preventing relative rotation is also provided between the segmented root of the inner stator unit and the shaft of the inner stator unit, and a winding is also installed at the lower end of the segmented salient pole of the inner stator unit.

Further, the limit disks fixed on both ends of the inner stator are divided into an outer limit disk and an inner limit disk from the outside to the inside according to the direction of the vehicle body, and the inner limit disk is formed by a sleeve arranged on the outside of the inner limit disk. Limiting, the outer limiting disk is limited by the shaft shoulder on the inner stator shaft, and the limiting disk fixes the inner stator on the inner stator shaft through the sleeve and the shaft shoulder of the inner stator shaft.

Further, it also includes motor end caps arranged at both ends of the outer rotor, which are divided into an outer motor end cap and an inner motor end cap from the outside to the inside according to the direction of the vehicle body, and the inner motor end cap and the outer motor end cap are at the holes of the outer rotor yoke. The three parts are connected and fixed by fasteners, and the inner motor end cover and the outer motor end cover are also connected by fasteners at the edge.

Further, it also includes a flange plate arranged coaxially with the inner stator, the flange plate is arranged on the side of the inner stator shaft shoulder away from the outer limit plate, and the flange plate is axially from the outside to the inside according to the direction of the vehicle body. The outer flange surface and the inner flange surface are respectively, the inner flange surface is arranged on the outer side of the outer motor end cover, and the outer end of the inner flange surface of the flange is sleeved into the central bearing hole of the outer motor end cover; The outer flange surface of the flange is provided with a coaxial rim, and the outer end of the outer flange of the flange is sleeved into the center bearing hole of the rim; the flange, the rim and the outer motor end cover Fastened together with fasteners.

Further, it also includes wheel hub bearings arranged in the inner circle of the inner motor end cover and the inner circle of the flange plate, the wheel hub bearings are double ball ball bearings; the inner motor end cover and the inner stator shaft are fixed by the double ball ball bearings together; two double ball bearings are arranged inside the flange, and the flange is fixedly connected to the outer side of the inner stator shaft shoulder through the two double ball bearings.

Further, the outer ring of the rim is provided with a tire, and the rim and the tire are fixedly connected together through the inner ring of the tire.

Compared with the prior art, the present invention has the following effective effects:

1) In the present invention, the salient poles of the inner stator are slotted at both ends of the axial direction, and the inner side of the salient poles of the outer rotor is slotted. The axial air gap formed by the inner stator unit and the outer rotor unit is smaller than the radial air gap. "Principle" to change the direction of the magnetic flux. Compared with the prior art, the present invention has the lowest radial magnetic flux density and the lowest radial electromagnetic force. It has little influence on the tangential magnetic density, and has a high magnetic flux density, which can output a high torque. The present invention under the condition of the road surface excitation produces stator and rotor vibration, eccentricity and other vertical negative effects, the The radial electromagnetic force is affected to a small extent, which can significantly improve the ride comfort of the vehicle.

2) In the present invention, a pair of radial pole shoes are added to the rotating overlapping contact directions of the inner stator and the outer rotor, and the slots are radially slotted in the opposite direction of the outer rotor. The magnetic flux effect and the saturation degree of the magnetic circuit are alleviated, and the slotting changes the current/voltage excitation conduction angle of each phase and the length of the rotor pole arc, and reduces the torque ripple of the hub switched reluctance motor.

3) The inner stator of the present invention is a separate structure, which makes the complex in-wheel switched reluctance motor structure more convenient to install and has a large degree of freedom in design. The sub-salient pole is modified to reduce the manufacturing cost, can be manufactured into multi-pole, and is not affected by the interference of the rotor structure of the motor during installation.

4) The salient poles of the inner stator and the outer rotor can be set to different lengths according to the output power, and the salient pole structures of the inner stator and the outer rotor can be interchanged according to the working requirements.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 Schematic diagram of the in-wheel motor of the present invention

Fig. 2 exploded schematic diagram of the in-wheel motor of the present invention

3 is a schematic diagram of the root of the inner stator block of the present invention

4 is a schematic diagram of the salient poles of the inner stator of the present invention

5 is a schematic diagram of the outer rotor of the present invention

Figure 6 is an enlarged schematic view of the outer rotor A of the present invention

7 is a schematic diagram of the magnetic flux circuit of the present invention

Among them: 1- tire; 2- connecting bolt; 3- inner motor end cover; 4- inner stator salient pole; 5- inner limit plate; 6, 16, 18- double ball bearing; 7- sleeve; 8- Inner stator segmented root; 9-limit nut; 10-winding; 11-outer rotor; 12-outer rotor hexagon bolt; 13-outer limit plate; 14-limit hexagon bolt; 15-rim nut; 17-inner set Sub-shaft; 19-Rim Hexagon Bolt; 20-Flange Plate; 21-Outer Rotor Nut; 22-Outer Motor End Cover; 23-Rim; 24-Feather Key; 25-Inner Stator; 111-Outer Rotor Salient Pole; 112 - radial pole piece; 113 - outer rotor salient pole slot; 114 - radial slot.

Detailed ways

As shown in the figure, the present invention provides an in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation, including an inner stator 25 and an outer rotor 11, and the inner circle of the outer rotor is circumferentially arranged with several radial The inner protruding outer rotor salient poles 111 are provided with inner stator salient poles 4 radially outwardly protruding on the outer circumference of the inner stator. The outer rotor salient pole slot 113 used; when the inner stator salient pole 4 passes through the outer rotor salient pole slot 113, the axial gap between the outer rotor salient pole slot 113 and the inner stator salient pole 4 is smaller than the outer rotor salient pole slot 113 The radial gap with the inner stator salient pole 4 is smaller than the radial gap between the outer rotor salient pole and the inner stator.

In this embodiment, the outer rotor salient poles 111 and the inner stator salient poles 4 are respectively provided with radial pole pieces 112 for suppressing torque pulsation in the rotational overlapping contact direction, and the outer rotor salient pole slots 113 are provided with inner stator salient pole pieces 112 . The radial slot 114 used in cooperation with the radial pole piece 112 on the pole 4 is provided at a position opposite to the rotational contact between the outer rotor salient pole slot 113 and the inner stator salient pole 4 .

4 , 5 and 6 , radial pole shoes 112 for suppressing torque ripple are respectively arranged on the outer rotor salient poles 111 and the inner stator salient poles 4 in the rotational overlapping contact direction, and the outer rotor salient pole slots 113 and the inner stator salient pole 4 are rotated and contacted with the radial slot 114 in the opposite direction, so as to change the size of the magnetic flux path and reduce the torque pulsation of the in-wheel motor.

1 and 7 , a radial air gap and an axial air gap are provided between the inner stator 25 and the outer rotor 11 , and two shafts are formed between the outer rotor salient pole slots 113 and the inner stator salient poles 4 . The radial gap between the inner stator salient poles 4 and the radial gap between the outer rotor salient poles 111 and the inner stator 25 are three radial air gaps, and the three radial air gaps formed are much larger than The two axial air gaps formed have the same length and width; the set axial air gap is between 0.2-0.5 mm, and the radial air gap is much larger than 0.5 mm, while the inner stator Different parameters can be set for the salient pole arc width and the outer rotor salient pole arc width according to the working conditions. The in-wheel motor of the present invention adopts the "minimum reluctance principle" to change the direction of the magnetic flux on the in-wheel motor, and can effectively reduce the radial electromagnetic force in the motor.

In this embodiment, the inner stator is of a separate structure, and the inner stator includes an inner stator salient pole 4 and an inner stator segment root 8, and the inner stator salient pole 4 communicates with the inner stator segment through the arc portion of the salient pole root. The arc-shaped deep groove portion of the block root portion 8 is snap-connected to form a whole.

In this embodiment, the inner stator shaft 17 for connecting and fixing the inner stator is also included, and the inner stator 25 fixes the inner stator segment root 8 on the inner stator shaft 17 through the limiting disks arranged at both ends of the inner stator 25 .

1, 3, and 4, when the inner stator 25 is installed, the end faces of both ends of the outer rotor 11 are set on the same reference plane as the end faces of the inner stator segment root 8, and the inner stator shaft 17 is rotated to drive the The inner stator segmented root 8 rotates, and from the space formed by the inner stator segmented root 8 and the outer rotor salient pole 11, the arc-shaped part of the root of the inner stator segmented salient pole 4 and the arc-shaped deep groove part of the inner stator segmented root 8 are sequentially connected. Install in sequence.

3, 4, and 7, the inner stator 25 is separated into the inner stator sub-block root 8 and the inner stator salient pole 4. This structure can set the switched reluctance motor into a multi-pole, and has a large degree of design freedom. The size of the magnetic circuit and the size of the winding window can be changed as required. When optimizing the structure of the inner stator 25, only the inner stator salient pole 4 can be optimized and manufactured. When doing related experiments, only the inner stator salient pole 4 can be optimized and manufactured. Replacement, reduce manufacturing costs, installation is not limited by the structure of the stator and rotor.

In this embodiment, a sliding key 24 for preventing relative rotation is further provided between the inner stator segment root 8 and the inner stator shaft 17 , and a winding 10 is also installed at the lower end of the inner stator segment salient pole 4 .

As shown in FIGS. 2 , 3 and 7 , the sliding key 24 arranged between the inner stator segment root 8 and the inner stator shaft 17 , in order to prevent relative rotation between the inner stator segment root 8 and the inner stator shaft 17 , the internal stator The sub-segment root 8 is in interference fit with the inner stator shaft 17 through the feather key 24; the winding 10 is fixed on the inner stator salient pole 4, and the position of the winding 10 can be fixed up and down at the joint part of the inner stator salient pole 4 and the inner stator segment root 8 .

Since the in-wheel motor of the present invention is a switched reluctance motor, when current excitation is applied to the winding 10, a magnetomotive force is generated in the winding. According to the "minimum reluctance principle", the magnetic field line will only pass from the shaft between the inner stator 25 and the outer rotor 11. Passing through the air gap and closing according to the shortest path, the magnetic flux in the radial direction reaches the lowest component, thereby reducing the radial electromagnetic force of the switched reluctance motor, and ignoring the edge magnetic flux effect, the axial electromagnetic force and the tangential electromagnetic force are formed. The axial air gap between the inner stator 25 and the outer rotor 11 is equal, and the inner stator salient pole 4 is located in the middle of the outer rotor salient pole 11, and the axial electromagnetic forces formed are balanced with each other. This structure has little influence on the tangential electromagnetic force.

5 , 6 , and 7 , a pair of radial pole shoes are added to the inner stator 25 and the outer rotor 11 in the rotationally overlapping contact directions. This radial pole shoe structure will change the inner stator 25 and the outer rotor 11 . The magnetic flux path and size before the overlapping contact of the salient poles, and the increase of the arc length of the radial pole shoe can effectively alleviate the edge magnetic flux effect and the saturation degree of the magnetic circuit of the switched reluctance motor, and at the same time reduce the higher harmonics of the torque. The outer rotor 11 is radially slotted in the opposite direction of the contact and overlap between the two. The width and radial length of the two salient pole pieces can be set with different parameters. The length of the pole arc of the radial slot will adjust the current and voltage excitation of each phase. The size of the angle can reduce the torque ripple of the switched reluctance motor.

In this embodiment, the limit plates fixed to both ends of the inner stator 25 are divided into an outer limit plate 13 and an inner limit plate 5 from the outside to the inside according to the direction of the vehicle body. The sleeve 7 on the outer side of the limit disk 5 is limited, and the outer limit disk 13 is limited by the shaft shoulder on the inner stator unit shaft 17, and the limit disk is limited by the sleeve 7 and the shaft shoulder of the inner stator shaft. The stator 25 is fixed to the inner stator shaft 17 .

1, 3, and 4, the inner limit disk 5 and the outer limit disk 13 are axially limited by the sleeve 7 and the shaft shoulder on the inner stator shaft 17, respectively, and the inner limit disk is limited in the axial direction. The disk 5 and the outer limit disk 13 further axially limit the inner stator segment root 8 and both ends of the salient pole 4, and the inner limit disk 5 and the outer limit disk 13 pass the limit hexagon bolts 14 and the limit The hexagonal nut 9 fixes the inner stator segment root 8 and the inner stator salient pole 4 together.

In this embodiment, it also includes motor end caps arranged at both ends of the outer rotor 11, which are divided into an outer motor end cap 22 and an inner motor end cap 3 according to the direction of the vehicle body from the outside to the inside. The inner motor end cap 3 and the outer motor end cap 22 The holes at the yoke of the outer rotor 11 are connected and fixed by fasteners, and the inner motor end cover 3 and the outer motor end cover 22 are also connected by fasteners at the edge.

As shown in FIGS. 1 , 2 and 5 , the outer motor end cover 22 is disc-shaped on the outside and the inner side is arc-shaped, the inner motor end cover 3 is in the shape of a circular basin and the inner side is stepped, and the inner side of the outer rotor 11 has four The salient pole part, the inner motor end cover 3 , the outer rotor 11 , and the outer motor end cover 22 pass through the outer rotor hexagon bolt 12 and the outer rotor hexagon nut 21 at the hole at the yoke of the outer rotor 11 . The inner motor end cover 3 and the outer motor end cover 22 are fixedly connected together by connecting bolts 2 at the edges.

In this embodiment, a flange 20 coaxially arranged with the inner stator shaft 17 is also included, and the flange is axially from the outside to the inside according to the direction of the vehicle body. It is arranged on the outside of the outer motor end cover 22, and the end of the inner flange surface is sleeved into the central bearing hole of the outer motor end cover 22; the outer flange surface of the flange plate 20 is provided with a coaxial rim 23, so The end of the outer flange surface is sleeved into the center bearing hole of the rim; the flange 20, the rim 23 and the outer motor end cover 22 are connected and fixed together by fasteners; the outer ring of the rim 23 is provided with tires 1. The rim 23 is fixedly connected with the tire 1 through the inner ring of the tire.

In this embodiment, it also includes a hub bearing arranged inside the inner motor end cover 3 and inside the flange, and the hub bearing is a double ball bearing; the inner motor end cover 3 and the inner stator shaft 17 pass through the double ball ball. The bearings 6 are fixed together; the flange 20 is internally provided with two double ball bearings, which are respectively the double ball bearing 16 and the double ball bearing 18, and the flange 20 is fixedly connected through the two double ball bearings. Outside of the sub-shaft shoulder.

1 and 2, the outer rotor hexagon bolts 12 are installed from the opening in the direction of the inner motor end cover 3, and the outer rotor hexagon bolts 12 are inserted into the bolt holes reserved for the outer rotor 11 at the same time, and the inner motor end cover 3 The outer casing is on the outside of the double ball bearing 6, so that the outer end face of the inner motor end cover 3 and the double ball bearing 6 are on the same datum plane. The outer rotor hexagon nut is tightened and connected, and at the same time, the flange 20 is sheathed on the outside of the double ball bearings 16 and 18, so that the outer end face of the flange 20 is in the same position as the double ball bearing 18 and the outer end face of the inner stator shaft 17. Finally, the inner motor end cover 3 and the outer motor end cover 22 are fixedly connected by the motor end cover hexagon screw 2.

1 and 2, the rim 23 is fixed on the outside of the flange 20 through the rim hexagon bolt 19 and the rim hexagon nut, and the rim 23 and the tire 1 are fixedly connected together through the inner ring of the tire. The outer rotor 11 drives the transmission route of the inner motor end cover 3, the outer motor end cover 22, the rim hexagon bolt 19, the rim hexagon nut 15, and the rim 23, and drives the entire tire to rotate.

The invention also discloses a vehicle. The vehicle adopts the in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation, which can prevent the in-wheel motor from generating vertical negative effects such as stator and rotor vibration and eccentricity under the condition of road excitation. , the radial electromagnetic force will be affected to a small extent, which can significantly improve the ride comfort of the vehicle. The in-wheel motor structure used in the vehicle to suppress radial electromagnetic force and torque pulsation will change the size of the magnetic flux path, so that the edge magnetic flux effect of the outer rotor and the inner stator and the saturation degree of the magnetic circuit are alleviated, and the slotting changes the current of each phase. / Voltage excitation conduction angle and rotor pole arc length to reduce torque ripple of hub switched reluctance motors.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. An in-wheel motor with suppressing radial electromagnetic force and torque pulsation is characterized in that: it comprises an inner stator and an outer rotor, and the inner circle of the outer rotor is arranged with a number of radially inwardly protruding outer rotors along the circumferential direction. Rotor salient poles, the outer circumference of the inner stator is provided with inner stator salient poles that protrude radially outward, and the outer rotor salient poles are provided with outer rotor salient pole slots for use by the inner stator salient poles; When the sub salient pole passes through the outer rotor salient pole slot, the axial gap between the outer rotor salient pole slot and the inner stator salient pole is smaller than the radial gap between the rotor salient pole slot and the stator salient pole and smaller than the rotor salient pole and the stator salient pole. Radial clearance between stators. 2 . The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 1 , wherein the outer rotor salient poles and the inner stator salient poles are respectively provided with torque restraining torques in the rotational overlapping contact directions. 3 . The pulsating radial pole shoes are provided with radial grooves in the salient pole grooves of the outer rotor salient poles for use with the radial pole shoes on the inner stator salient poles, the radial grooves are arranged between the outer rotor salient pole grooves and the The inner stator salient poles are rotated to contact the opposite direction position. 3 . The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 1 , wherein the inner stator is a separate structure, and the inner stator comprises inner stator salient poles and inner stator sub-blocks. 4 . The root part, the inner stator salient pole is connected to the arc-shaped deep groove part of the inner stator sub-block root through the arc-shaped part of the salient-pole root to form a whole. 4. The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 3, characterized in that it further comprises an inner stator shaft for connecting and fixing the inner stator, and the inner stator is arranged on two sides of the inner stator. The limit disc at the end fixes the root of the inner stator segment on the inner stator shaft. 5. The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 4, characterized in that: between the segmented root of the inner stator unit and the shaft of the inner stator unit, there is further provided a mechanism for preventing relative rotation. A sliding key is provided, and a winding is also installed at the lower end of the segmented salient pole of the inner stator unit. 6. The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 4, wherein the limit plates fixed on both ends of the inner stator are divided into outer limit plates from the outside to the inside according to the direction of the vehicle body A position plate and an inner limit plate, the inner limit plate is limited by a sleeve arranged on the outer side of the inner limit plate, the outer limit plate is limited by the shoulder on the inner stator shaft, the limit plate The inner stator is fixed on the inner stator shaft by the sleeve and the shoulder of the inner stator shaft. 7. The in-wheel motor with suppressing radial electromagnetic force and torque pulsation according to claim 1, characterized in that: further comprising motor end covers arranged at both ends of the outer rotor, divided into outer motor ends from the outside to the inside according to the direction of the vehicle body Cover and inner motor end cover, the inner motor end cover and the outer motor end cover are connected and fixed by fasteners at the hole at the outer rotor yoke, and the inner motor end cover and the outer motor end cover are between the inner motor end cover and the outer motor end cover. The edges are also connected by fasteners. 8 . The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 1 , further comprising a flange plate arranged coaxially with the inner stator, and the flange plate is arranged on the inner stator shaft. 9 . The shaft shoulder is away from the side of the outer limit plate, the flange plate is axially separated from the outside to the inside according to the direction of the vehicle body, the outer flange surface and the inner flange surface, and the inner flange surface is arranged on the outer side of the outer motor end cover, and The outer end of the inner flange surface of the flange is sleeved into the central bearing hole of the outer motor end cover; the outer flange surface of the flange is provided with a coaxial rim, and the outer flange surface of the flange is provided with a coaxial rim. The outer end is sleeved into the central bearing hole of the wheel rim; the flange plate, the wheel rim and the outer motor end cover are connected and fixed together by fasteners. 9. The in-wheel motor with suppressing radial electromagnetic force and torque pulsation according to claim 7, characterized in that it further comprises hub bearings arranged in the inner circle of the inner motor end cover and the inner circle of the flange, so The hub bearing is a double ball bearing; the inner motor end cover and the inner stator shaft are fixed together by the double ball bearing; two double ball bearings are arranged inside the flange, and the flange passes through the two double ball bearings. The bearing is fixedly attached outside the inner stator shaft shoulder. 10 . The in-wheel motor capable of suppressing radial electromagnetic force and torque pulsation according to claim 7 , wherein the outer ring of the rim is provided with a tire, and the rim and the tire are fixedly connected together through the inner ring of the tire. 11 .

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