Sheath of high-speed permanent magnet motor rotor

A technology of permanent magnet motors and sheaths, which is applied to the rotating parts of the magnetic circuit, the shape/style/structure of the magnetic circuit, etc., which can solve the problems of difficult cooling and heat dissipation of the rotor, high loss density of the rotor, etc., to reduce the volume and area, reduce the Eddy current loss, effect of improving heat dissipation conditions
CN104917318AInactive Publication Date: 2015-09-16HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2015-09-16
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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