Motor rotor, motor, compressor and air conditioner

Abstract

The application provides a motor rotor, a motor, a compressor and an air conditioner. The motor rotor comprises a plurality of magnetic poles which are distributed in the circumferential direction, wherein each magnetic pole comprises a first permanent magnet (1) and a second permanent magnet (2); the first permanent magnets (1) are positioned on the d shaft of thee motor; the second permanent magnets (2) are positioned on the q shaft of the motor; the first permanent magnets (1) are magnetized in the radial direction; the second permanent magnets (2) are magnetized in the tangential direction; and the coercive force temperature coefficients [alpha] d of the first permanent magnets (1) are greater than the coercive force temperature coefficients [alpha] q of the second permanent magnets (2). According to the motor rotor, the high-frequency operation capacity of the compressor can be improved, the low-frequency energy efficiency is not influenced, and the energy efficiency ratio of thewhole machine is improved.

Description

technical field [0001] The present application relates to the technical field of motors, in particular to a motor rotor, a motor, a compressor and an air conditioner. Background technique [0002] The built-in permanent magnet synchronous motor has the characteristics of small size and high efficiency, and is widely used in air-conditioning compressors. Since the excitation of permanent magnet motors is not adjustable, its maximum operating speed is limited. With the improvement of air-conditioning system's requirements for low-temperature heating conditions, it is necessary for the compressor to run stably at a higher speed. The problem is that the low-frequency energy efficiency is reduced, and the energy efficiency ratio of the whole machine is reduced. Contents of the invention [0003] Therefore, the technical problem to be solved in this application is to provide a motor rotor, motor, compressor and air conditioner, which can improve the high-frequency operation ca...

AI Technical Summary

Problems solved by technology

Since the permanent magnet motor excitation is not adjustable, its maximum operating speed is limited

With the improvement of air-conditioning system's requirements for low-temperature heating conditions, it is necessary for the compressor to run stably at a higher speed. The problem is that the low-frequency energy efficiency is reduced, and the energy efficiency ratio of the whole machine is reduced.

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