High-power-density high-efficiency permanent magnet synchronous motor used for vehicle

Abstract

The invention discloses a high-power-density high-efficiency permanent magnet synchronous motor used for a vehicle. Under each electrode, a permanent magnet rotor of the motor is placed in a four-part type Halbach array mode. In each electrode, a copper ring is additionally arranged on the upper portion of a permanent magnet. Two parts of the edge of each electrode is in tangential magnetizing. Two parts in the middle are in opposite-angle magnetizing. The high-power-density high-efficiency permanent magnet synchronous motor used for the vehicle has the advantages that magnetic field joining among electrodes is utilized, flux density of a yoke portion of each rotor is reduced, a magnetism collecting effect in the Halbach array mode is achieved, magnetic flow of the permanent magnets is fully gathered toward a stator side, gap flux density of the motor is improved, and accordingly torque density and power density of the motor are increased. The permanent magnets in the Halbach array mode are high in magnetic resistance, the capacity of resisting a harmonic current of the stator is strong, and eddy-current loss and torque pulsation of the permanent magnets are reduced. The permanent magnets in the Halbach array mode are good in stability of working points, magnetic flow of the rotors is stable, iron core loss of the rotors is effectively reduced, and the efficiency of the motor is improved.

Description

technical field [0001] The invention relates to new energy vehicle motor technology, in particular to a permanent magnet synchronous motor with high power density and high efficiency for vehicles. Background technique [0002] Due to the advantages of good torque and speed characteristics, higher efficiency than other types of motors, and convenient control, permanent magnet synchronous motors generally use permanent magnet motors in general electric vehicles, especially electric cars. The permanent magnet material NdFeB has high residual magnetic induction intensity, large magnetic induction coercive force, and extremely high maximum magnetic energy. It is currently the permanent magnet material with the highest magnetic performance. Permanent magnet motors for electric vehicles generally use NdFeB as permanent magnet materials. [0003] Due to the limitation of the space and the quality of the whole vehicle, the electric car requires the motor to have a large power densit...

AI Technical Summary

Problems solved by technology

However, the motor adopts field-weakening control in the high-speed area, and the operating frequency of the motor is high. The loss of the silicon steel sheet of the motor and the eddy current loss of the permanent magnet material are high. Generally, the efficiency of the traditional permanent magnet synchronous motor is often low at high speed.

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