Rotor of permanent magnet motor, permanent magnet motor and compressor

Abstract

The invention discloses a rotor of a permanent magnet motor, the permanent magnet motor and a compressor. The rotor includes a rotor iron core and a plurality of permanent magnets. The rotor iron coreis provided with a center hole and a plurality of magnet slots. The plurality of magnet slots are arranged in the circumferential direction of the center hole. Each of the magnet slots extends in theradial direction of the center hole. Portions, located at the two ends of each of the permanent magnets in the radial direction, of each of the magnet slots form first magnetic isolation slots. The rotor iron core is provided with a second magnetic isolation slot on at least one side of each of the magnet slots in the circumferential direction. Each second magnetic isolation slot separates a single-sided area where the second magnetic isolation slot is located into a plurality of magnetic field pathways distributed in the radial direction. In two magnetic field pathways adjacent in the radialdirection, the minimum width of the magnetic field pathway located on the outer side in the radial direction is smaller than the minimum width of the magnetic field pathway on the inner side in the radial direction. According to the permanent magnet motor of the embodiment of the invention, the magnetization characteristics of the rotor iron core are improved, and noises of the permanent magnet motor are reduced.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a rotor of a permanent magnet motor, a permanent magnet motor and a compressor. Background technique [0002] The embedded permanent magnet motor is divided into two structures: radial flux and tangential flux according to the direction of flux. In the permanent magnet motor with tangential flux structure, the permanent magnets in the rotor extend along the radial direction of the rotor. For permanent magnet motors with a tangential flux structure, since the two working surfaces of the permanent magnets directly face the air gap, compared with the radial flux structure, the flux utilization rate is higher, which is more conducive to achieving high efficiency and miniaturization. [0003] However, in the tangential flux structure, since one end of the permanent magnet protrudes into the vicinity of the inner hole of the rotor, it is difficult to saturate the magnetization after the per...

AI Technical Summary

Problems solved by technology

[0003] However, in the tangential flux structure, since one end of the permanent magnet protrudes into the vicinity of the inner hole of the rotor, it is difficult to saturate the magnetization after the permanent magnet is inserted into the rotor. This problem is one of the technical difficulties of the tangential flux structure motor

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