High torque low loss permanent magnet fault tolerant motor

Abstract

The invention discloses a high-torque low-loss permanent magnet fault-tolerant motor. The motor comprises a hybrid stator and a rotor, wherein an air gap is formed between the hybrid stator and the rotor; the hybrid stator comprises a stator tooth with a small groove in the tooth end, and a stator tooth without small groove in the tooth end; the tooth bodies of the two stator teeth are parallel, and both perpendicularly extend to the yoke part of the stator; multiple modulation levels are formed in the tooth end of the stator tooth with the small groove in the tooth end; the small groove does not exist in the end part of the stator tooth without small groove in the tooth end; instead, the stator tooth is a straight tooth with a simple structure, and a stator groove is formed between the two stator teeth; a concentrated armature winding is embedded in the stator groove; and permanent magnets are arranged on the inner side of the circumference of the rotor. According to the high-torque low-loss permanent magnet fault-tolerant motor, the novel hybrid stator structure is adopted, so that the numbers of the modulation levels and the pole pairs of the permanent magnets in the permanent magnet fault-tolerant vernier motor are reduced; the inter-polar magnetic leakage of the permanent magnets is reduced; the utilization ratio of the permanent magnets is improved; the motor loss is lowered; the high-torque density of the motor is achieved with an extremely small number of pole pairs; and meanwhile, the motor efficiency is improved to a certain degree.

Description

technical field [0001] The invention relates to a permanent magnet vernier motor, especially a permanent magnet fault-tolerant vernier motor, which is suitable for applications requiring high torque density and high reliability, and belongs to the technical field of novel motor manufacturing. Background technique [0002] The permanent magnet vernier motor is a new type of special motor based on the basic magnetic gear magnetic field modulation effect, which can match the armature magnetic field generated by the high-speed armature winding with the low-speed permanent magnet rotating magnetic field after modulation. Therefore, it has the characteristics of high torque density and is very suitable for rail transit, ship propulsion and electric vehicle applications that require high torque. However, the traditional permanent magnet vernier motor uses distributed armature windings, which makes the electrical, magnetic, thermal and physical coupling between the motor phases more...

AI Technical Summary

Problems solved by technology

It can be seen that, under the condition of keeping the number of winding pole pairs constant, the increase of the number of modulation poles will inevitably lead to the increase of the number of permanent magnet pole pairs, which makes the number of permanent magnet pole pairs of the motor of the above invention too high

It can be seen from the basic knowledge of electrical machinery that if the number of pole pairs of permanent magnets is too large, it will inevitably increase the magnetic flux leakage between the poles of the permanent magnets and reduce the utilization rate of the permanent magnets.

China Invention Patent Application No. 201510532041.X discloses a built-in permanent magnet fault-tolerant vernier motor with a magnetic concentration effect. By using radial permanent magnets, the magnetic flux leakage between the poles of the permanent magnets is improved to a certain extent. However, Due to the traditional stator structure, the number of pole pairs of the permanent magnets is still high, and the problem of excessive magnetic flux leakage between the poles of the permanent magnets has not been fundamentally solved

[0004] On the other hand, in the above invention, the traditional stator structure leads to too high number of permanent magnet pole pairs in the motor, which will inevitably increase the electrical frequency of the motor operation, increase the core loss of the motor, and reduce the efficiency of the motor

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