Permanent magnet synchronous motor rotor and permanent magnet synchronous motor

Abstract

The invention discloses a permanent magnet synchronous motor rotor and a permanent magnet synchronous motor. The permanent magnet synchronous motor rotor provided by the invention comprises a rotor iron core and a permanent magnet body, wherein a plurality of pairs of permanent magnet body grooves are formed in the radial direction of the rotor iron core; each pair of permanent magnet body grooves are in V shape distribution; the sharp part of the V shape faces a rotating shaft; the permanent magnet body is embedded into the permanent magnet body groove; the shape of the permanent magnet body is matched with the shape of the permanent magnet body groove; the cross section of the permanent magnet body is in a trapezoid shape; the width of the cross section of the permanent magnet body is gradually decreased from outside to inside in the radial direction of the rotor iron core. The invention also discloses the permanent magnet synchronous motor with the permanent magnet synchronous motor rotor. The permanent magnet synchronous motor rotor and the permanent magnet synchronous motor provided by the invention have the advantages that the demagnetization resistance capability can be further improved; the motor output torque can be improved.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a permanent magnet synchronous motor rotor. The present invention also relates to a permanent magnet synchronous motor having the above permanent magnet synchronous motor rotor. Background technique [0002] The permanent magnet synchronous motor provides excitation with permanent magnets, which makes the motor structure relatively simple, reduces the processing and assembly costs, and improves the reliability of the motor operation; and because no excitation current is required and no excitation loss, the efficiency and power density of the motor are improved. It has become a motor that is more and more widely used in various fields. [0003] At present, there are two types of permanent magnet materials inserted in the rotor, one is ferrite and the other is NdFeB. In the rotor using NdFeB permanent magnet material, the torque generated is large, but...

AI Technical Summary

Problems solved by technology

[0005] Due to the small reluctance near the two ends of the outer permanent magnet of the rotor, it is easy to concentrate the diamagnetic field of the coil of the stator on the two ends of the permanent magnet, and severe demagnetization occurs at both ends of the permanent magnet, which reduces the torque and even makes the motor not working properly

However, if the permanent magnets are arranged in this way, the width of the permanent magnets cannot be thicker due to the limitation of the inner diameter of the rotor.

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