A permanent magnet assisted synchronous reluctance motor for electric vehicles

Abstract

The invention discloses a permanent magnet auxiliary synchronous reluctance motor for electric vehicles. The invention solves the problems of large torque ripple, narrow high-speed field-weakening constant power range, and low motor efficiency and power density in the permanent magnet assisted synchronous reluctance motor in the prior art. The motor includes a rotor iron core, and a plurality of magnetic barrier groups are arranged on the rotor iron core. The magnetic barrier group includes a first magnetic barrier, a second magnetic barrier and a third magnetic barrier that are arranged at intervals along the d-axis. The first magnetic barrier passes through the middle. The partition part is divided into two accommodating slots, the second magnetic barrier and the third magnetic barrier are respectively divided into four accommodating slots by the side partition part of the middle partition part, and ferrites are arranged in the first magnetic barrier and the third magnetic barrier , a rare earth permanent magnet is arranged in the second magnetic barrier. The invention improves the motor power density and the motor efficiency, and greatly improves the range of the motor's high magnetic field weakening and constant power. The mixed use of ferrite and rare earth permanent magnet greatly improves the low temperature demagnetization resistance of ferrite, improves magnetic density distribution, and reduces torque ripple.

Description

technical field [0001] The invention relates to the technical field of synchronous motors, in particular to a permanent magnet auxiliary synchronous reluctance motor for electric vehicles. Background technique [0002] At present, permanent magnet synchronous reluctance motors are more and more widely used, but the commonly used rare earth permanent magnets are very expensive, accounting for about 50% of the raw material cost of the entire motor. The torque is reduced, the corresponding amount of permanent magnet steel is also reduced, and the permanent magnet cost of the motor is also reduced. Therefore, the development of rare earth or even no rare earth permanent magnet auxiliary synchronous reluctance motor is the future trend. [0003] In order to pursue a higher salient pole ratio, the current permanent magnet-assisted synchronous reluctance motor usually involves a multi-layer magnetic barrier structure, and a permanent magnet or ferrite is inserted into the magnetic ...

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Problems solved by technology

[0004] The present invention mainly solves the problems of large torque pulsation, narrow high-speed weak magnetic constant power range, and low motor efficiency and power density in the permanent magnet assisted synchronous reluctance motor in the prior art, and provides a permanent magnet assisted synchronous reluctance motor for electric vehicles. reluctance motor

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