Permanent magnet synchronous motor and compressor

Abstract

The invention provides a permanent magnet synchronous motor and a compressor. The permanent magnet synchronous motor comprises a motor stator and a motor rotor, wherein the motor stator comprises a stator core and a stator winding, the stator core comprises a plurality of stator teeth in the circumferential direction, a stator slot is defined between any two adjacent stator teeth, and the stator slots are used for accommodating the stator winding wound on the stator teeth; the motor rotor is sleeved and matched with the motor stator, the motor rotor comprises a rotor core and a plurality of permanent magnets, the end face of the rotor core is provided with a plurality of groups of slots in the circumferential direction of the rotor core, the plurality of permanent magnets are embedded in the plurality of groups of accommodating slots, the plurality of stator teeth can be divided into a plurality of tooth groups which are sequentially arranged according to the rotation direction of themotor rotor, each tooth group comprises a plurality of stator teeth which are adjacent in pairs, and at least one stator tooth in the plurality of stator teeth which are adjacent in pairs is wound with an out-phase winding. According to the technical scheme of the invention, the counter electromotive force of the stator winding can be improved when the motor is in operation, so that the copper loss of the winding is reduced, and the motor performance is improved.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a permanent magnet synchronous motor and a compressor. Background technique [0002] The permanent magnet synchronous motor in the rotary DC inverter compressor mostly adopts a permanent magnet motor with a built-in permanent magnet structure, and each coil of the stator winding is wound on the stator teeth. [0003] In the related art, the number of poles of the magnet in the rotor core and the number of stator slots on the motor stator are 5:6 or 7:6, so that the permanent magnet synchronous motor has a higher winding coefficient, and then can Improve the efficiency of the motor, but the permanent magnet of this structure has the following defects: [0004] (1) There are low-order magnetomotive force harmonics of the armature winding in the gap between the motor stator and the motor rotor. Due to the large penetration depth of such harmonics, large eddy current losses will be genera...

AI Technical Summary

Problems solved by technology

[0004] (1) There are low-order magnetomotive force harmonics of the armature winding in the gap between the motor stator and the motor rotor. Due to the large penetration depth of such harmonics, large eddy current losses will be generated in the motor rotor, resulting in motor performance deterioration

[0005] (2) The low-order harmonics of the armature magnetic field will also make the internal magnetic field distribution of the motor uneven, resulting in local saturation of the motor, thereby reducing the average torque of the motor and increasing the torque ripple, resulting in greater vibration Noise, worsening the user's sense of hearing

Images