Rotor of high-speed permanent magnet motor

Abstract

The invention discloses a rotor of a high-speed permanent magnet motor. The rotor of the high-speed permanent magnet motor comprises a rotary shaft, a rotor core, a permanent magnet, a rotor cooling channel and a protective sleeve, wherein the rotor cooling channel is formed in the center of the rotary shaft; cooling media like water or oil are led into the cooling channel; the protective sleeve is a semi-magnetic permeable alloy protective sleeve. Spiral grooves are evenly formed in the outer surface of the protective sleeve. The rotor of the high-speed permanent magnet motor is a surface-mounting type permanent magnet, and the protective sleeve is in interference fit with the permanent magnet. The rotor core can be made of low-loss silicon steel sheet materials and can also be made of carbon steel materials, and when the rotor core is made of carbon steel materials, the rotor core and the rotary shaft are of an integrated structure. The phenomenon that as a permanent magnet is subjected to severe magnetism loss and even irreversible demagnetization under high temperature, a motor cannot operate reliably is avoided.

Description

technical field [0001] The invention belongs to the technical field of motors and relates to a high-speed permanent magnet motor rotor. Background technique [0002] Due to the high speed, high power density and small size, the high-speed motor can effectively save materials; due to the small moment of inertia, the dynamic response is fast; the high-speed motor can be directly connected with the working machine or load, eliminating the traditional mechanical transmission device , thus reducing noise and improving the efficiency of the transmission system. The research and application of high-speed motors meet the needs of economic development for energy saving and emission reduction. At present, it has become one of the research hotspots in the field of international electrical engineering. It has broad application prospects. [0003] Permanent magnet motors are most suitable for high-speed motors due to their simple structure, high force-energy density, no excitation loss...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The present invention provides a high-speed permanent magnet motor rotor, the purpose of which is to solve the problem of insufficient permanent magnet strength and easy damage of the previous high-speed permanent magnet motor rotor under the condition of high-speed rotation, as well as the large eddy current loss of the rotor and the difficulty in dissipating heat. The problem that the output and temperature rise are too high will seriously affect the reliability and operating life of the motor

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