Sheath of high-speed permanent magnet motor rotor

Abstract

The invention discloses a sheath of a high-speed permanent magnet motor rotor. A high-speed permanent magnet motor comprises a permanent magnet and a revolving shaft, wherein the permanent magnet is attached to the revolving shaft. The sheath of the high-speed permanent motor rotor tightly fixes the permanent magnet on the revolving shaft; the sheath is made of a non-magnetically-conductive alloy; the sheath is of a cylindrical structure; the cylindrical wall of the cylindrical structure is provided with grooves which are distributed uniformly; and the sheath is used for reducing the eddy current loss of the rotor and dissipating heat. Through the grooves, the size of the alloy sheath is reduced, and the formation of large-area eddy current is blocked, so that the eddy current loss in the alloy sheath can be effectively reduced. When the alloy sheath rotates at a high speed along with the permanent magnet rotor, gap air is driven to form strong turbulence, so that heat generated by the permanent magnet rotor is directly taken away, and the heat dissipation condition of the high-speed permanent magnet rotor is improved.

Description

technical field [0001] The invention relates to a sheath for a rotor of a high-speed permanent magnet motor. Background technique [0002] Compared with traditional motors, high-speed permanent magnet motors have higher power density, higher reliability, and smaller size ratio due to the use of rare earth permanent magnet materials with high magnetic energy product for excitation in existing permanent magnet motors. In recent years, it has aroused great interest and extensive research in the industry. This type of motor has many industrial applications such as compressors, vacuum pumps, turbine generators, flywheel energy storage systems, drilling tools, friction welding equipment, etc. In these high-speed industrial units, the intermediate link of the gearbox is omitted, and the application is directly connected with the rotating shaft of the motor, which not only reduces the size of the equipment, but also improves the transmission efficiency of the equipment and the reli...

AI Technical Summary

Problems solved by technology

Considering the difficulty of mechanical manufacturing, the rotor of high-speed permanent magnet motor usually adopts the permanent magnet surface-mounted magnetic circuit structure. In order to protect the permanent magnet and enhance the mechanical strength of the permanent magnet rotor, it usually adopts a high-strength alloy or fiber sheath structure. Compared with traditional motors, high-speed permanent magnet motors have higher rotor loss density and more difficult rotor cooling and heat dissipation

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