High-torque-density asymmetrical rotor structure

Abstract

The invention relates to a high-torque-density asymmetrical rotor structure. The rotor structure comprises a one-way displacement asymmetrical rotor structure and a two-way displacement asymmetrical rotor structure. Ferrite permanent magnets and neodymium-iron-boron permanent magnets are distributed on a rotor, the ferrite permanent magnets are distributed in a spoke shape, and the neodymium-iron-boron permanent magnets are distributed in a linear shape and arranged on the outer circle of the rotor. The axis of each neodymium-iron-boron permanent magnet of the one-way displacement structure anticlockwise deflects by an angle alpha from the central line of the ferrite permanent magnet adjacent to the neodymium-iron-boron permanent magnet of the one-way displacement structure; the neodymium-iron-boron permanent magnets of the two-way displacement structures clockwise and anticlockwise rotate by an angle beta and an angle gamma respectively. By means of the hybrid permanent magnet structure, the peak hybrid permanent-magnet torque and the peak reluctance torque reach the maximum at the same time at a same current angle, and the permanent-magnet utilization rate and the output torque of a motor are improved; the air-gap flux density waveform is effectively improved, the cogging torque and the torque pulsation are reduced, and the core loss and the eddy-current loss are reduced.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an asymmetric rare-earth-less permanent magnet rotor structure with high torque density, which is suitable for applications such as compressors, air conditioners, electric tools, and electric vehicles. Background technique [0002] With the development of rare earth permanent magnet materials, permanent magnet motors mainly based on NdFeB have high efficiency, high power density, high reliability and other remarkable features, and various structural designs, so the optimization of permanent magnet motor structure Design, which can maximize its performance and efficiency, is more and more widely used in various fields of national economy. In recent years, the over-exploitation of rare earth minerals has not only caused a sharp decline in rare earth reserves, but also caused serious damage to the ecological environment. In order to protect rare earth resources and alleviate the pric...

AI Technical Summary

Problems solved by technology

Since the rare earth motor uses ferrite permanent magnets with low coercive force to replace part of the rare earth permanent magnets, the torque output capability is limited and the ferrite permanent magnets may demagnetize

The permanent magnet is surrounded by ferromagnetic material, which can easily lead to magnetic flux leakage between the poles. When the motor rotates, the air gap waveform will be distorted, and its radial component will cause vibration between the stator and the rotor, and lead to a decline in the inherent performance of the motor.

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