Permanent magnet synchronous motor rotor structure with reverse salient pole characteristic

Abstract

The permanent magnet synchronous motor rotor structure with the reverse salient pole characteristic comprises a rotor iron core and a quadrature axis magnetic barrier, a plurality of permanent magnet grooves extending in the radial direction are formed in the rotor iron core, the permanent magnet grooves are distributed at intervals in the circumferential direction, a permanent magnet is arranged in each permanent magnet groove, and the quadrature axis magnetic barrier is arranged between the permanent magnet grooves. The quadrature-axis magnetic barriers comprise first magnetic barriers and second magnetic barriers, the first magnetic barriers are arc-shaped and are distributed on the rotor iron core at intervals along the circumferential direction, and the second magnetic barriers are funnel-shaped and are distributed on the rotor iron core at intervals along the circumferential direction. According to the permanent magnet synchronous motor rotor structure with the reverse salient pole characteristic, the magnetic barriers in the radius direction and the circumferential direction are arranged at the quadrature axis of the rotor, so that quadrature axis inductance is reduced, and the sinusoidal property of no-load air gap flux density of the motor is improved. And meanwhile, the reverse salient pole structure can reach a wider running speed, and the speed expansion capability is stronger.

Description

Technical field [0001] The present invention relates to the field of permanent magnet motor technology, particularly to a permanent magnet synchronous motor rotor structure having anti-convex characteristics. Background [0002] Permanent magnet synchronous motors are increasingly used in various fields, but due to the difficulty of magnetic field regulation, their applications in occasions where the speed regulation range is required. The traditional positive salience permanent magnet synchronous motor has a high no-load back potential, and when the high-speed section adopts a weak magnetic field control to limit the back EMF, once the inverter fails, the weak magnetic field will be out of control, which may produce instantaneous feedback power generation phenomenon, so that the inverter power device is damaged. The above factors limit the development and application of traditional positive convex permanent magnet synchronous motors. [0003] With the development of the anti-sal...

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