High-speed permanent magnet motor rotor structure with composite sheath

Abstract

The invention discloses a high-speed permanent magnet motor rotor structure with a composite sheath. The structure comprises a shaft, a rotor, permanent magnets and the composite sheath, and the permanent magnets closely fit the surface of the rotor; the composite sheath comprises a heat collecting layer, non-metallic sheath rings, heat conducting layers and a heat dissipating layer, and the heatcollecting layer is located on the innermost layer of the sheath and warps the permanent magnets; the non-metallic sheath rings and the heat conducting layers are circumferentially wrapped outside theheat collecting layer at intervals; the heat dissipating layer is wrapped on the outer surfaces of the non-metallic sheath rings and heat conducting layers. By means of the structure, the problems that common rotor structures have poor mechanical strength, large eddy current loss or poor heat dissipation conditions and the like are solved, the heat and temperature rise of the rotor is reduced onthe basis of ensuring sufficient mechanical strength of the rotor, and the operation reliability of a high-speed permanent magnet motor is improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a rotor structure of a high-speed permanent magnet motor with a composite sheath. Background technique [0002] Motors are an important part of industrial systems, and motors with excellent performance are crucial to industrial systems. Compared with ordinary speed motors, high-speed motors have the advantages of high power density and can directly drive high-speed loads. High-speed permanent magnet motors not only have the advantages of high-speed motors, but also have the advantages of high efficiency and high power factor, so they have broad application prospects. [0003] Due to the insufficient mechanical strength of the permanent magnet of the surface-mounted high-speed permanent magnet motor, a rotor sheath needs to be wrapped outside it to prevent the permanent magnet from flying out or breaking during operation. Therefore, the rotor of the surface-mounted hi...

AI Technical Summary

Problems solved by technology

However, if the copper layer is too thin, the mechanical strength of the rotor cannot be guaranteed, and a layer of non-conductive non-metallic sheath needs to be added, and the non-metallic sheath hinders the heat dissipation of the rotor; if the copper layer is too thick, although the rotor is guaranteed Mechanical strength, but the eddy current loss of the copper layer will increase significantly, causing the rotor to overheat

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