CN113517797A

CN113517797A - A hybrid stator pole stator permanent magnet motor

Info

Publication number: CN113517797A
Application number: CN202110690963.9A
Authority: CN
Inventors: 阳辉; 刘杨阳; 林鹤云; 陈晓敏
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2021-10-19

Abstract

The invention discloses a hybrid stator pole stator permanent magnet motor, comprising a stator, a rotor, an armature winding and a non-magnetically conductive rotating shaft, the rotor is arranged around the outside of the non-magnetically conductive rotating shaft, and the stator is arranged around the outside of the rotor , the stator includes a stator yoke and a plurality of stator poles of two different structures located inside the stator yoke and arranged at intervals, namely a first stator pole and a second stator pole, the first stator pole includes two iron core teeth and The first permanent magnet is sandwiched between the two iron core teeth. The first permanent magnet is in the shape of a long strip and is magnetized in a tangential direction. The second stator pole includes an iron core salient pole and a second permanent magnet adjacent to the iron core salient pole. The magnet, the second permanent magnet is tile-shaped and magnetized radially, and the armature winding is wound on the first stator pole. The invention has simple structure and strong robustness, can reduce the amount of permanent magnets and improve the torque capacity.

Description

Mixed stator pole stator permanent magnet motor

Technical Field

The invention relates to a permanent magnet motor, in particular to a hybrid stator pole stator permanent magnet motor.

Background

Permanent magnet motors are often divided into rotor permanent magnet motors and stator permanent magnet motors according to the permanent magnet position, with rotor permanent magnet motors developing earlier and more mature. In recent decades, with the continuous development of permanent magnet materials and power electronic technologies, the stator permanent magnet motor has the characteristics of body height robustness and high torque density, so that the stator permanent magnet motor is widely concerned and researched by scientific researchers. The most common three stator permanent magnet motors are doubly salient permanent magnet motors, flux switching motors and flux reversing motors.

The traditional magnetic flux switching motor utilizes the characteristic of high magnetic energy product of a permanent magnet and has magnetic-gathering type permanent magnet arrangement, so that the motor has the characteristics of high power density and high efficiency, but the whole permanent magnet penetrates through a stator core, the using amount of the permanent magnet is large, the structure limits the area of a stator slot on one hand and further limits final permanent magnet torque, and on the other hand, the permanent magnet is expensive and generally occupies a remarkable position in the motor cost, so that the cost of the magnetic flux switching motor is also high finally, and the large-scale diffusion and application of the magnetic flux switching motor are not facilitated.

The traditional flux reversal motor permanent magnet body surface is pasted at the lower end of the stator tooth, the structure is simple, the installation is convenient, the torque density is high, compared with the traditional flux switching motor, the permanent magnet consumption is less, but the flux leakage between the permanent magnets is larger, and the final torque output capacity is limited. The flux reversal motor adopting the alternating pole structure can reduce flux leakage between permanent magnets to a certain extent so as to further improve torque output and further reduce the permanent magnet consumption. The torque output capability of the alternating pole flux reversing permanent magnet machine is still comparable to that of the conventional flux switching permanent magnet machine.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a mixed stator pole stator permanent magnet motor which is high in torque density, small in permanent magnet consumption and small in flux leakage between permanent magnet poles.

The technical scheme is as follows: the invention discloses a mixed stator pole stator permanent magnet motor which comprises a stator, a rotor, an armature winding and a non-magnetic rotating shaft, wherein the rotor is arranged around the outside of the non-magnetic rotating shaft, the stator is arranged around the outside of the rotor, the stator comprises a stator yoke and a plurality of first stator poles and second stator poles, the first stator poles and the second stator poles are positioned on the inner side of the stator yoke and are arranged at intervals, the first stator poles comprise two iron core teeth and a first permanent magnet clamped between the two iron core teeth, the second stator poles comprise iron core salient poles and second permanent magnets arranged adjacent to the iron core salient poles, and the armature winding is wound on the first stator poles.

Furthermore, the magnetizing direction of the first permanent magnet on the first stator pole is tangential, and the magnetizing directions of the first permanent magnets of two adjacent first stator poles are opposite.

Furthermore, the first permanent magnet on the first stator pole is integrally in a strip shape.

Furthermore, the magnetizing directions of the second permanent magnets on the second stator poles are radial, and the magnetizing directions of the second permanent magnets of two adjacent second stator poles are opposite.

Further, the second permanent magnet on the second stator pole is integrally tile-shaped.

Further, the core salient poles and the second permanent magnets are adjacent to the rotor.

Further, the core salient poles and the second permanent magnets of two adjacent second stator poles are arranged in an opposite order.

Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:

1. the permanent magnet and the armature winding are arranged on the stator, so that the heat dissipation of the permanent magnet and the winding is facilitated, the rotor is the same as a salient pole rotor of the switched reluctance motor, and the permanent magnet and armature winding structure is simple and firm and has strong robustness.

2. Compared with the traditional flux switching motor, the stator slot area is increased, and the permanent magnet consumption is obviously reduced.

3. The invention adopts the mixture of two different stator pole structures, can improve the torque density, reduce the leakage between permanent magnet poles, improve the permanent magnet utilization rate, and has obvious application prospect in the aspects of household appliances, low-speed direct drive and the like.

Drawings

FIG. 1 is a cross-sectional view of an electric machine of the present invention;

FIG. 2 is a magnetic flux distribution plot of the motor of the present invention with maximum reversal of the A-phase flux linkage;

fig. 3 is a magnetic flux distribution diagram when the a-phase flux linkage of the motor of the present invention is maximum in the forward direction.

Detailed Description

The present invention will be further described with reference to the following examples.

The present embodiment provides a hybrid stator pole stator permanent magnet motor, as shown in fig. 1, including a stator 1, a rotor 2, an armature winding 3, and a non-magnetic rotating shaft 4, where the rotor 2 is disposed around the outside of the non-magnetic rotating shaft 4, and the stator 1 is disposed around the outside of the rotor 2. The stator 1 is a salient pole structure, and specifically includes a stator yoke 1.1 and a plurality of first stator poles 1.2 and second stator poles 1.3 that are located the stator yoke 1.1 inboard and set up at intervals, and first stator pole 1.2 includes two iron core teeth 1.21 and presss from both sides the first permanent magnet 1.22 in the middle of two iron core teeth 1.21, and first permanent magnet 1.22 magnetizes the direction for the tangent, and the first permanent magnet magnetizes opposite direction of two adjacent first stator poles. The second stator pole 1.3 comprises an iron core salient pole 1.31 and a second permanent magnet 1.32 arranged adjacent to the iron core salient pole 1.31, the iron core salient pole 1.31 and the second permanent magnet 1.32 are close to the rotor 2, the second permanent magnet 1.32 is a surface-mounted permanent magnet, the magnetizing directions are radial, the magnetizing directions of the second permanent magnets of two adjacent second stator poles are opposite, and the arrangement sequence of the iron core salient poles of the two adjacent second stator poles and the second permanent magnets is opposite. The rotor 2 is a salient pole structure and comprises a rotor yoke 2.2 and rotor teeth 2.1 positioned on the outer side of the rotor yoke 2.2, and permanent magnets and excitation windings are not arranged on the rotor teeth. Both the first permanent magnet 1.22 and the second permanent magnet 1.32 are neodymium iron boron permanent magnets. The armature winding 3 is a concentrated winding and is wound on the first stator pole 1.2.

The motor has the following operation principle:

as shown in fig. 2, the a-phase flux linkage reaches a reverse maximum when the rotor tooth 2.1 centerline approaches the core tooth centerline on one side of the first stator pole 1.2, and as shown in fig. 3, the a-phase flux linkage reaches a forward maximum when the rotor tooth 2.1 centerline approaches the core tooth centerline on the other side of the first stator pole 1.2. And the two positions in the middle of the two positions can reach the zero value of the A-phase flux linkage. When the rotor rotates, the phase flux linkage is alternated positively and negatively to induce an alternating opposite potential, and when three-phase sine alternating current with corresponding frequency is introduced, stable electromagnetic torque can be generated.

The above is the scheme when the number of rotor teeth is odd, and when the number of rotor teeth is even, the basic operation principle is also applicable, but the opposite potential harmonic wave is obviously increased, and the torque ripple is increased therewith.

The permanent magnets on the first stator pole and the second stator pole are arranged in two modes, wherein one mode is the permanent magnet arrangement mode shown in fig. 1, the permanent magnets on the second stator pole and the permanent magnets on the adjacent first stator pole are opposite in polarity and are defined as reverse series in a series magnetic circuit formed by the stator yoke 1.1, and the other mode is that the magnetizing directions of the permanent magnets on the second stator pole in fig. 1 are all opposite, the magnetizing directions of the permanent magnets on the first stator pole are unchanged, at the moment, the permanent magnets on the second stator pole and the permanent magnets on the adjacent first stator pole are identical in polarity and are defined as positive series in a series magnetic circuit formed by the stator yoke 1.1. The anti-series permanent magnet arrangement is preferred over the positive series arrangement, which produces greater torque output capability, so the anti-series arrangement shown in fig. 1 is preferred.

The permanent magnet consumption of the invention is obviously reduced compared with the traditional flux switching motor with the same size, the cost can be effectively reduced, and the final torque capacity is improved due to the increase of the groove area and the change of the magnetic circuit, and the utilization rate of the permanent magnet is further improved.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A hybrid stator pole stator permanent magnet motor, comprising a stator, a rotor, an armature winding and a non-magnetically conductive rotating shaft, the rotor is arranged around the outside of the non-magnetically conductive rotating shaft, and the stator is arranged around the outside of the rotor, which It is characterized in that: the stator includes a stator yoke and a plurality of first stator poles and second stator poles that are located inside the stator yoke and are spaced apart, and the first stator pole includes two iron core teeth and is sandwiched between the two iron core teeth. The first permanent magnet, the second stator pole includes an iron core salient pole and a second permanent magnet arranged adjacent to the iron core salient pole, and the armature winding is wound on the first stator pole.

2 . The hybrid stator-pole-stator permanent magnet motor according to claim 1 , wherein the magnetizing direction of the first permanent magnet on the first stator pole is tangential, and two adjacent first stators are in the tangential direction. 3 . The first permanent magnets of the poles are magnetized in opposite directions.

3 . The hybrid stator-pole-stator permanent magnet motor according to claim 1 , wherein the first permanent magnet on the first stator pole is in the shape of a long strip as a whole. 4 .

4 . The hybrid stator pole stator permanent magnet motor according to claim 1 , wherein the magnetization direction of the second permanent magnet on the second stator pole is radial, and the two adjacent second stator poles The magnetization direction of the second permanent magnet is opposite.

5 . The hybrid stator-pole-stator permanent magnet motor according to claim 1 , wherein the second permanent magnet on the second stator pole is in the shape of a tile as a whole. 6 .

6 . The hybrid stator-pole-stator permanent magnet motor according to claim 1 , wherein the core salient pole and the second permanent magnet are close to the rotor. 7 .

7 . The hybrid stator-pole-stator permanent magnet motor according to claim 1 , wherein the arrangement order of the iron core salient poles and the second permanent magnets of two adjacent second stator poles is opposite. 8 .