A rotor structure of a permanent magnet interior permanent magnet synchronous motor

Abstract

The application discloses a rotor structure of a permanent magnet built-in synchronous motor, which comprises a rotor iron core, permanent magnets and a rotating shaft. The rotor iron core is provided with two groups of through slots, namely, double-layer offset "V+U" type through slots and three-layer "U" type through slots. The permanent magnets comprise double-layer offset "V+U" type permanent magnet units and three-layer magnetoresistive permanent magnet auxiliary units arranged in the two groups of through slots. The offset "V+U" type permanent magnet units are composed of a radial inner layer "V" type permanent magnet group and a radial outer layer "U" type permanent magnet group, each layer of which is provided with two straight side wing permanent magnets with different lengths, thereby forming an asymmetric offset structure. In the magnetoresistive permanent magnet auxiliary units, each layer of rectangular permanent magnet groups is arranged in the straight bottom side of each layer of "U" type through slots and is separated into two rectangular permanent magnets by a middle magnetic bridge. The application reduces the cost of the motor, improves the salient pole ratio and magnetoresistive torque of the motor, enhances the torque output capacity and the flux-weakening performance of the motor, and has a good application prospect in a low-speed large-torque direct drive system.

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