Permanent magnet synchronous motor and compressor having same

Abstract

The invention discloses a permanent magnet synchronous motor and a compressor provided with the same. The permanent magnet synchronous motor comprises a stator and a rotor. The rotor comprises a rotor iron core and a plurality of rotor magnets. The rotor iron core is provided with a plurality of placing grooves. The multiple rotor magnets are arranged in the multiple placing grooves. A plurality of slits are formed in the rotor iron core and located between the corresponding placing grooves and the outer peripheral wall of the rotor iron core. The slits between a first shaft d and a first shaft q are distributed in a concentric circle with a point O1 as the circle center, the vertical distance L1 between the point O1 and a straight line u meets the formula: L1>=R-L2 / 2, a connecting line of the point O1 and the center O of the rotor is defined as a connecting line v with the center O of the rotor as a fixed point, and an included angle alpha of the connecting line v and a second shaft d meets the formula: alpha<=270 degrees / P. According to the permanent magnet synchronous motor, air gap flux density and counter potential waveforms are improved, the cogging torque amplitude and load torque fluctuations are reduced, radial electromagnetic force is reduced easily, and therefore electromagnetic noise of the motor is reduced.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, in particular to a permanent magnet synchronous motor and a compressor having the same. Background technique [0002] It is pointed out in the related art that a permanent magnet motor has a stator wound with coils and a rotor with permanent magnets. The inside of the rotor core is provided with slots for placing the permanent magnets. Generally, it is necessary to obtain as sinusoidal air-gap magnetic field as possible to weaken harmonics, so as to obtain as stable torque output as possible and as small radial electromagnetic force as possible, so that the motor has high performance and low vibration and noise. However, the magnets of the built-in permanent magnet motor are magnetized in parallel, which is not conducive to the formation of a sinusoidal air gap magnetic field. Contents of the invention [0003] The present invention aims to solve at least one of the technical prob...

AI Technical Summary

Problems solved by technology

However, the magnets of the built-in permanent magnet motor are magnetized in parallel, which is not conducive to the formation of a sinusoidal air gap magnetic field

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