A permanent magnet synchronous motor

Abstract

The application relates to a permanent magnet synchronous motor, which comprises a stator core with an inner circumferential surface, a rotor core arranged in the stator core and having an outer circumferential surface, the outer circumferential surface comprising a plurality of different concentric circular arc surfaces and forming an uneven air gap with the inner circumferential surface of the stator core, and the rotor core comprising at least two fan-shaped segments, each of which is provided with a plurality of pairs of magnetic steel grooves penetrating the rotor core in the axial direction. The permanent magnet synchronous motor provided by the application forms an uneven air gap with the inner circumferential surface of the stator core by arranging a plurality of circular arcs in a ladder shape on the outer circumferential surface of the rotor core, thereby effectively improving the sinusoidal property of the air gap magnetic density, reducing the distortion rate of the counter electromotive force and the torque fluctuation, and improving the motor performance.

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