High-power-density permanent magnet dual-stator brushless doubly-fed motor

Abstract

The invention relates to a high-power-density permanent magnet dual-stator brushless doubly-fed motor. The brushless doubly-fed motor comprises an outer stator, an inner stator and a rotor, wherein the rotor is positioned between the inner stator and the outer stator; a stator groove is formed in the inner side of the outer stator; an outer rotor groove is formed in the outer side of the rotor; an inner rotor groove is formed in the inner side of the rotor; the rotor adopts an integrally-formed structure; windings with the number of pole pairs of p1 are distributed on the stator groove; permanent magnets with the number of pole pairs of p2 are distributed on the inner stator; a set of rotor windings capable of forming magnetic fields with the number of pole pairs of p1 and p2 can be formed on the inner rotor groove and the outer rotor groove respectively; the rotor windings on the inner side and the outer side of the rotor are the same in phases; the rotating speed of the rotor is n; the frequency fr of the rotor windings is equal to np1 / 60; and the output frequency f1 of the outer stator windings is equal to n(p1+p2) / 60. By adoption of the brushless doubly-fed motor provided by the invention, the utilization ratio of the motor is improved, the power density of the motor is increased, and the performance of the motor is improved.

Description

technical field [0001] The invention relates to the technical field of brushless double-fed motors, in particular to a brushless double-fed motor with high power density permanent magnet double stators. Background technique [0002] AC excitation brushless doubly-fed motor is suitable for variable-speed constant-frequency power generation and variable-frequency speed regulation systems, and its characteristic is that the inverter required for system operation has small capacity and reliable operation. [0003] The existing brushless double-fed motors can be divided into two types according to the structure of the motor body, namely cascade type and magnetic field modulation type. The cascaded structure is composed of two sub-motors whose magnetic fields do not interfere with each other and are coaxially connected. There is only electrical connection between the two sub-motors, and there is no magnetic field coupling. The advantage of the cascaded motor is that the number of...

AI Technical Summary

Problems solved by technology

The disadvantage of cascaded motors is that the axial length of the motor is too long, making it difficult to apply in occasions where the axial length is limited

At the same time, since the invalid volume occupies a large space, the space utilization rate and power density are reduced

The magnetic field modulation brushless double-fed motor has unlimited axial length, but the power density of the magnetic field modulation motor is lower than that of the cascaded motor, and there are large torque ripples, obvious vibration and noise

The new double-stator brushless double-fed motor rotor proposed in recent years uses a magnetic isolation support ring to separate the two magnetic fields, which makes the coupling ability of the motor poor, the output voltage is low, and the output power is low, and the efficiency and efficiency of the motor are low. Low power density

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