A rotor assembly, motor, compressor

Abstract

A rotor assembly, a motor, and a compressor relate to the technical field of motors and compressors. The rotor assembly includes a rotor, and the rotor includes a rotor iron core and a plurality of permanent magnets arranged in the rotor iron core. There are a plurality of accommodating slots rotatably arranged along the central axis, the permanent magnets are arranged in the accommodating slots, the axial length of the permanent magnets is not less than the axial length of the stator core, and the permanent magnets are provided with temperature displacement adjustment components . The present invention can automatically adjust the axial position of the permanent magnet in the accommodating slot with the temperature through the temperature displacement adjustment component. Since the axial length of the permanent magnet is not less than the axial length of the stator core, the rotor core is facing The effective magnetic permeability length of the stator iron core is changed, and the permanent magnet configuration that automatically adjusts the position is realized, which can achieve the effect of adjusting the magnetic field of each pole of the rotor, solve the problem of limited rotor speed, and widen the speed range of the rotor, motor and compressor. At the same time, the structure is simple and the cost is low.

Description

technical field [0001] The invention relates to the technical field of motors and compressors, in particular to a rotor assembly, a motor and a compressor. Background technique [0002] Permanent magnet motors are widely used due to their advantages of high efficiency and high power density. The permanent magnet motor rotor magnetic field is generated by permanent magnets, so it has the characteristic that the induced voltage increases with the increase of the speed. Since the magnetic flux of the permanent magnet is difficult to adjust, the induced voltage increases proportionally with the increase of the rotational speed. Its induced voltage value is limited by the voltage of the power supply, so the speed range of the permanent magnet motor is also limited. [0003] In order to increase the speed range of the permanent magnet motor, part of the current is passed through the stator coil to offset the magnetic field generated by the permanent magnet, thereby reducing the ...

AI Technical Summary

Problems solved by technology

When the rotor rotates, the internal temperature rises, and the temperature displacement adjustment assembly can automatically adjust the axial position of the permanent magnet in the accommodation slot with the temperature. Since the axial length of the permanent magnet is not less than the axial length of the stator core, at this time The effective magnetic length of the stator core facing the rotor core changes, and then the effective magnetic field size of the interaction between the rotor and the stator can be adjusted, and the temperature adjustment of the permanent magnet position can be realized, which solves the problem of the limited rotor speed and broadens the field of view. Rotor speed range

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