A rotor assembly and a permanent magnet motor

Abstract

The invention discloses a rotor assembly and a permanent magnet motor, wherein, the rotor assembly comprises a rotor iron core provided with a shaft hole and a plurality of permanent magnet slots, alternating poles are formed between two adjacent permanent magnet slots, the rotor iron core is further provided with a first air slot distributed along the circumferential direction of the shaft hole,and the first air slot is arranged between the shaft hole and the permanent magnet slot. As such, that existence of the first air slot significantly shorten the length of the magnetic circuit of the second magnetic circuit, improves the utilization ratio of the magnetic line of force, adjusts the distribution of the magnetic lines of force on the adjacent magnetic poles, reduce the torque fluctuation, and limits the magnetic flux leakage phenomenon of the third magnetic circuit, and the existence of the first air slot greatly improves the output torque of the motor; Thus, the problem that theoutput torque of the motor decreases due to the long magnetic circuit of the magnetic field line reaching the alternating poles, the torque fluctuation is large, and the output torque of the motor decreases due to the flux leakage phenomenon of the rotating shaft of the motor is solved.

Description

technical field [0001] The present invention relates to the technical field of motor equipment, and more particularly, to a rotor assembly and a permanent magnet motor. Background technique [0002] The number of permanent magnets used in the alternating-pole permanent magnet motor in the prior art is only half of the number of permanent magnets in the traditional permanent magnet motor, so the use of permanent magnets is more sufficient, and the usage of permanent magnets can be significantly reduced, thereby reducing the cost of the motor . [0003] Alternating pole permanent magnet motors include stator and rotor assemblies with attached figure 1 It is a schematic structural diagram of the cross section of the rotor assembly in the prior art, wherein the rotor assembly includes a rotor iron core, the center of the rotor iron core is provided with a shaft hole 2 for installing the motor shaft 12, and the rotor iron core is provided with a plurality of permanent shafts at ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a rotor assembly and a permanent magnet motor, which solves the problem that the output torque of the motor decreases due to the long magnetic path of the magnetic force lines reaching the alternate poles, the torque fluctuation is large, and the phenomenon of magnetic flux leakage of the motor shaft causes the motor The problem of output torque drop

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