CN213661295U

CN213661295U - M type permanent magnet in-wheel motor magnetic circuit structure

Info

Publication number: CN213661295U
Application number: CN202022941008.1U
Authority: CN
Inventors: 王立坤; 龚浩文; 邢洪凯
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-07-09
Anticipated expiration: 2030-12-10

Abstract

The utility model relates to a M type permanent magnetism in-wheel motor magnetic circuit structure belongs to the motor structural design category, and the primary structure includes the stator, the rotor, the pivot, the permanent magnet, and the magnetism separates the material, the winding groove, the rotor auxiliary tank, the rotor vent, the rotor adopts embedded rotor structure, and the in-wheel motor of inner rotor formula is more extensive than outer rotor type application in the aspect of power density. The utility model provides a performance that M type permanent magnetism wheel hub motor magnetic circuit structure can be effectual in the aspect of cogging torque, average electromagnetic torque to the magnetization direction of such M type permanent magnet arrangement for the magnetic density waveform has good distribution characteristic, and the quasi-sinusoidal curve between crest and trough makes its sinusoidal fundamental wave content composition show and improves, and the air gap magnetic density approaches to sinusoidal waveform gradually. The concave auxiliary groove of the rotor can reduce torque pulsation, is beneficial to improving the working performance of the motor, and the vent of the rotor has good exhaust performance, reduces the temperature of the generator and improves the operating efficiency of the generator.

Description

M type permanent magnet in-wheel motor magnetic circuit structure

Technical Field

The utility model relates to a motor structure technical field especially relates to a M type permanent magnet in-wheel motor magnetic circuit structure.

Background

The hub motor technology is also called as wheel built-in motor technology, and is a hub device technology which integrates a motor, a transmission system and a brake system. In view of the characteristics and development trend of various driving technologies, the hub motor technology is the final driving form of the electric automobile. The rotor structure of the permanent magnet hub motor is divided into an inner rotor and an outer rotor, the two structures are applied to the current electric automobile, but with the occurrence of a compact planetary gear speed change mechanism, a high-speed inner rotor type driving system has higher competitiveness in terms of power density than a low-speed outer rotor type driving system, the performance of the hub motor can be effectively improved in terms of cogging torque, average electromagnetic torque and the like by the improved M-type permanent magnet structure, the concave auxiliary groove can effectively reduce pulsating torque, improve the waveform of air gap magnetic density, weaken counter electromotive force harmonic waves, reduce vibration noise of the permanent magnet synchronous motor, and have important practical significance for prolonging the service life of the motor system and improving the control precision.

SUMMERY OF THE UTILITY MODEL

For solving above technical problem, the utility model provides a M type permanent magnet wheel hub motor magnetic circuit and concave type auxiliary groove structure to reduce permanent magnet wheel hub motor's tooth's socket torque, reduce the pulsation torque effectively, wheel hub motor's average electromagnetic torque when improving the operation reduces permanent magnet synchronous motor's vibration noise, and then improves motor torque output performance.

In order to achieve the above object, the utility model provides a following scheme: the utility model provides a M type permanent magnet in-wheel motor magnetic circuit and concave type auxiliary groove structure, including stator, rotor, pivot, M type permanent magnet and separate magnetic material, winding groove, rotor auxiliary groove, ventilation hole. The rotor is embedded in the stator, the rotor and the stator are coaxial, the rotating shaft is arranged at the center of the rotor, the permanent magnets are uniformly arranged on the rotor in an M shape, and the magnetism isolating material is placed at the end part of the M-shaped permanent magnet.

Optionally, a plurality of vent holes are formed through the rotor.

Optionally, a plurality of auxiliary grooves are provided on the rotor.

The utility model discloses for prior art gain following technological effect: the main structure of the magnetic circuit structure of the M-type permanent magnet hub motor comprises a stator, a rotor, a rotating shaft, a permanent magnet, a magnetic isolation material, a rotor auxiliary groove, a winding groove and a vent hole, the permanent magnet hub motor has better operating characteristics, the rotor adopts an embedded radial rotor, the cogging torque is small, the rotating shaft does not need to take a magnetic isolation measure, the concave auxiliary groove can effectively reduce the pulsation torque, improve the waveform of the air gap magnetic density, weaken the counter electromotive force harmonic wave, reduce the vibration noise of the permanent magnet hub motor and meet the requirements of high power density and high torque density; the rotor vent has good exhaust performance, can reduce the motor operation noise, reduces the iron core loss, strengthens the motor radiating effect, reduces the temperature of the motor, and improves the operation efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below. It is to be understood that the drawings described below are merely exemplary of some of the embodiments of the invention. It is also possible for a person skilled in the art to obtain them from these figures without the inventive effort of other efforts.

Fig. 1 is the structure schematic diagram of the magnetic circuit structure of the M-shaped permanent magnet hub motor of the present invention.

Fig. 2 is the schematic diagram of the magnetization direction of the M-type permanent magnet hub motor of the present invention.

Description of reference numerals: 1. a stator; 2. a rotor; 3. a rotating shaft; 4. a permanent magnet; 5. a winding slot; 6. an auxiliary groove; 7. a magnetic barrier material; 8. a vent hole.

Detailed Description

The technical solution in the embodiment is explicitly and completely described in the present invention. The described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The implementation of the embodiments of the present invention also relates to other embodiments that can be obtained by a person skilled in the art without inventive work.

The first embodiment is as follows: as shown in fig. 1, the present embodiment provides a magnetic circuit structure of an M-type permanent magnet hub motor, including a stator 1, a rotor 2, a rotating shaft 3, a permanent magnet 4, winding slots 5, auxiliary slots 6, a magnetic isolation material 7, and a ventilation hole 8; the rotor 2 is embedded in the stator 1, the rotor 2 is coaxial with the stator 1, the rotating shaft 3 is arranged at the center of the rotor 2, and the permanent magnets 4 are uniformly arranged on the rotor 2 and are M-shaped.

In this embodiment, the magnetic shielding material 7 is disposed at the end of the M-shaped permanent magnet.

The permanent magnet hub motor in the embodiment has better operation characteristics, the rotor 2 adopts an embedded radial rotor, the cogging torque is small, and a magnetic isolation measure is not required to be taken on the rotating shaft 3; the rotor vent 8 has good exhaust performance, can reduce the operation noise of the motor, reduce the loss of an iron core, strengthen the heat dissipation effect of the motor, reduce the temperature of the generator and improve the operation efficiency of the generator.

The rotor 2 adopts an M-shaped permanent magnet structure, so that the air gap flux density of the motor can be improved, and the torque output performance of the motor can be improved. The improved M-shaped permanent magnet structure in the embodiment can effectively improve the performance of the hub motor in the aspects of cogging torque, average electromagnetic torque and the like, the concave auxiliary groove can effectively reduce pulsating torque, improve the waveform of air gap flux density, weaken counter electromotive force harmonic waves, reduce the vibration noise of the permanent magnet synchronous motor, and increase the torque output and weak magnetic speed regulation capacity of the motor in the constant power speed regulation stage, thereby improving the power output smoothness and speed regulation capacity of the motor, and meeting the characteristics of high power density and high torque density of the permanent magnet hub motor.

The permanent magnet magnetizing mode shown in fig. 2 enables the motor air gap flux density sine distribution degree to be high, the harmonic content to be low, and the magnetic field performance of the inner permanent magnet rotor and the outer permanent magnet rotor to the rotating motor to be further improved.

In the present invention, the principles and embodiments of the present invention are described by way of specific examples, and the above description of the embodiments is only provided to assist in understanding the basic method and concept of the present invention; also, to those of ordinary skill in the art, the concepts of the present invention have been adapted for use in varying ways and applications. In view of the above, the contents of the specification should not be construed as limiting the present invention.

Claims

1. The utility model provides a M type permanent magnet in-wheel motor magnetic circuit structure, its characterized in that includes the stator, the rotor, the pivot, M type permanent magnet and magnetism isolating material, the winding groove, the concave type auxiliary tank of rotor, the rotor ventilation hole, the rotor is embedded in the stator, the rotor with the stator is coaxial, the pivot is established in rotor center department, the permanent magnet is in align to grid is the M type on the rotor, magnetism isolating material place in the tip of M type permanent magnet.

2. An M-type pm in-wheel motor magnetic circuit structure as claimed in claim 1, wherein said rotor has 12 ventilation holes uniformly arranged along the circumferential direction.

3. An M-type pm in-wheel motor magnetic circuit structure as claimed in claim 1, wherein said concave auxiliary slots are uniformly distributed along the circumferential direction of the rotor.