CN112910134A

CN112910134A - Novel structure of combined type permanent magnet motor

Info

Publication number: CN112910134A
Application number: CN202110305762.2A
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: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-06-04

Abstract

The invention relates to a novel permanent magnet motor structure, which belongs to the field of motor structure design. The surface-mounted permanent magnet motor has the advantages that the rotor magnetic steel is directly mounted on the surface of the rotor core, the assembly is simple, the mass production efficiency is high, the torque fluctuation is small, and the control precision is high. The embedded permanent magnet motor has relatively small air gap, compact structure, higher torque density and wider constant power speed range. The permanent magnet structure introduced by the invention combines the advantages of a surface-mounted mode and an embedded mode, and provides a method for weakening the cogging torque by designing the asymmetrical width of the pole arc of the magnetic pole, so that the cogging torque of the permanent magnet synchronous motor is weakened, and the cogging torque is minimized. The stator water through hole has good exhaust performance, reduces the temperature of the generator per se, and improves the operation efficiency of the generator.

Description

Novel structure of combined type permanent magnet motor

Technical Field

The invention relates to the technical field of motor structures, in particular to a novel magnetic circuit structure of a permanent magnet motor.

Background

The conventional permanent magnet synchronous motor is divided into a surface type rotor and a built-in type rotor according to a rotor structure. The two structures are applied to the current motor industry, the improved embedded surface-mounted composite rotor permanent magnet structure can effectively improve the performance of the hub motor in the aspects of cogging torque, average electromagnetic torque and the like, and the method can effectively weaken the cogging torque peak value of the motor, reduce torque pulsation and improve the average torque of the motor. The method has important practical significance for prolonging the service life of a motor system and improving the control precision.

Disclosure of Invention

In order to solve the technical problems, the invention provides a magnetic circuit structure of an embedded surface-mounted composite rotor permanent magnet motor, which is used for reducing the cogging torque of a permanent magnet hub motor, effectively reducing the pulsating torque, improving the average electromagnetic torque of the hub motor during operation, reducing the vibration noise of the permanent magnet synchronous motor and further improving the torque output performance of the motor.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a magnetic circuit structure of a motor with a surface-mounted composite rotor permanent magnet embedded, which comprises a stator, a rotor, a rotating shaft, a permanent magnet I, a permanent magnet II, a permanent magnet III, a winding groove and a stator limber 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 I are uniformly arranged in the rotor, and the permanent magnets II and the permanent magnets III are uniformly arranged on the surface of the rotor.

Optionally, a plurality of water through holes are arranged on the stator in a penetrating manner.

Compared with the prior art, the invention has the following technical effects: the permanent magnet motor magnetic circuit structure mainly comprises a stator, a rotor, a rotating shaft, a permanent magnet I, a permanent magnet II, a permanent magnet III, a winding groove and a water through hole, the permanent magnet synchronous motor has better running characteristics, the rotor adopts an embedded surface-mounted composite rotor, the cogging torque is small, and the rotating shaft does not need to take a magnetic isolation measure, so that the pulsation torque can be effectively reduced, the waveform of the air gap magnetic density is improved, the counter electromotive force harmonic wave is weakened, the vibration noise of the permanent magnet hub motor is reduced, and the requirements of high power density and high torque density can be met; the stator limbers have good exhaust performance, can reduce motor operation noise, reduce the iron core loss, strengthen the motor radiating effect, reduce the temperature of motor self, improve its operating 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 a schematic structural diagram of a magnetic circuit structure of an embedded surface-mounted composite permanent magnet motor according to the present invention.

Description of reference numerals: 1. a stator; 2. a rotor; 3. a rotating shaft; 4. a permanent magnet I; 5. a permanent magnet II; 6. a permanent magnet III; 7. a water hole.

Detailed Description

The invention explicitly and completely describes the technical scheme in the embodiment. 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 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 embedded surface-mounted composite permanent magnet motor, including a stator 1, a rotor 2, a rotating shaft 3, a permanent magnet i 4, a permanent magnet ii 5, a permanent magnet iii 6, and a water through hole 7; the rotor 2 is embedded in the stator 1, the rotor and the stator are coaxial, the rotating shaft is arranged at the center of the rotor, the permanent magnets I are uniformly arranged in the rotor, and the permanent magnets II and the permanent magnets III are uniformly arranged on the surface of the rotor.

The permanent magnet hub motor in the embodiment has better operation characteristics, the rotor 2 adopts an embedded surface-mounted composite rotor, and the tooth space torque is small through the asymmetrical design of the pole arc width of the magnetic pole, and no magnetism isolating measure is needed to be taken on the rotating shaft 3; the stator water through opening 8 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 generator per se, and improves the operation efficiency.

The rotor 2 adopts an embedded surface-mounted composite rotor 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 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 the 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 the weak magnetic speed regulation capacity of the motor in the constant power speed regulation stage, thereby improving the power output smoothness and the 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 ensures that the motor air gap flux density sine distribution degree is high, the harmonic content is low, and the magnetic field performance of the inner permanent magnet rotor and the outer permanent magnet rotor to the rotating motor can be further improved.

In the present invention, the principles and embodiments of the present invention are described by specific examples, and the above description of the embodiments is only for assisting understanding of the basic method and idea of the present invention; also, the manner in which the concepts of the present invention are applied and the scope of application have changed to those of ordinary skill in the art. 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 novel permanent magnet motor structure, its characterized in that, includes the stator, the rotor, the pivot, permanent magnet I, permanent magnet II, permanent magnet III, the winding groove, the stator limbers, the rotor embedded in the stator, the rotor with the stator is coaxial, the pivot is established in rotor center department, permanent magnet I is in the inside align to grid of rotor, permanent magnet II and permanent magnet III are in rotor surface align to grid.

2. The magnetic circuit structure of permanent magnet motor according to claim 1, wherein centers of permanent magnets ii are distributed in X-axis and Y-axis directions, two direction axes perpendicular to each other with the center of the rotation axis as an origin are the X-axis and the Y-axis, the center of permanent magnet iii is 60 ° from the center of permanent magnet ii, and the center of permanent magnet i is 34.5 ° from the center of permanent magnet 2.

3. The permanent magnet motor magnetic circuit structure according to claim 1, wherein 24 water holes are uniformly arranged on the stator along the circumferential direction.