Rotor core, rotor, motor and compressor

Abstract

The invention discloses a rotor core, a rotor, a motor and a compressor. The outer contour of the rotor core comprises d-axis arc sections, q-axis arc sections and a plurality of connecting sections, the circle centers of the d-axis arc sections are overlapped with the center of the rotor core, and the d-axis of the rotor core penetrates through the centers of the d-axis arc sections; the circle centers of the q-axis arc sections are overlapped with the center of the rotor core, and the q-axis of the rotor core penetrates through the centers of the q-axis arc sections; the connecting sections are connected between the adjacent d-axis arc sections and q-axis arc sections, and at least one of the connecting sections is a circular arc which has a circle center located on the outer side of the rotor core and is arranged adjacent to the q-axis, wherein the semi-diameters of the d-axis arc sections are Rd, the semi-diameters of the q-axis arc sections are Rq, and Rq / Rd is greater than 0.9 and smaller than or equal to 1. According to the rotor core disclosed by the invention, the harmonic content of gap flux density can be reduced, and the rotor core is simple in structure, easy to manufacture and produce and high in rate of finished products; and meanwhile, the operation performance of a motor under a weak magnetic working condition can be improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a rotor core, a rotor with the rotor core, a motor with the rotor and a compressor with the motor. Background technique [0002] In the permanent magnet embedded motors in the related art, some of them have relatively large vibration and noise, others have complex structures, are difficult to manufacture and produce, and have a low yield rate, and the direct-axis inductance and quadrature-axis inductance of the motor are small, which affects the motor. Performance under field weakening operating conditions. Contents of the invention [0003] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention needs to provide a rotor core, which can not only optimize the distribution of air-gap magnetic density, reduce the harmonic content of air-gap magnetic density, but also have a simple structure, easy manufa...

AI Technical Summary

Problems solved by technology

[0002] In the permanent magnet embedded motors in the related art, some vibrations and noises are relatively large, while others have complex structures, are difficult to manufacture and produce, and have a low yield rate, and the direct-axis inductance and quadrature-axis inductance of the motor are small, which affects the motor. Performance in Field Weakening Operating Conditions

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