Rotor of high-speed Halbach-type permanent magnet motor

Abstract

The invention provides a rotor of a high-speed Halbach-type permanent magnet motor. The rotor comprises a Halbach-type permanent magnet structure, a rotor shaft and a rotor sheath, wherein the Halbach-type permanent magnet structure comprises strip-shaped rectangular permanent magnets and strip-shaped arc permanent magnets; the external surfaces of the strip-shaped arc permanent magnets are arc-shaped; the strip-shaped rectangular permanent magnets and the strip-shaped arc permanent magnets are arranged in the peripheral direction of the rotor shaft at intervals; the rotor sheath is arranged outside the strip-shaped rectangular permanent magnets and the strip-shaped arc permanent magnets; the adjacent strip-shaped rectangular permanent magnets and strip-shaped arc permanent magnets are directly laminated; and a groove corresponding to the strip-shaped rectangular permanent magnets or the strip-shaped arc permanent magnets is formed in the rotor shaft or the rotor sheath. Due to the structural design of the rotor, the numerical value of the air-gap flux density of the rotor is improved; the sine degree of the waveform is enhanced; the power density of the motor is improved; the flux density of a rotating shaft yoke is reduced; the hollow rotating shaft provides a cooling channel for the rotor; and the dynamic response ability of the rotor is improved.

Description

technical field [0001] The invention relates to a rotor of a high-speed Halbach type permanent magnet motor. Background technique [0002] In the high-speed Halbach type permanent magnet motor in the prior art, in order to prevent the permanent magnets of the rotor from falling off and moving relative to the sheath shaft in the circumferential direction, it is usually necessary to reinforce the permanent magnets on the rotor. The common method of reinforcement is to heat-shrink a high-strength alloy or composite material sheath on the outer surface of the permanent magnet, which requires that the sheath not only have sufficient thickness, but also have sufficient interference with the surface of the permanent magnet. If the sheath is too thick, it will increase the reluctance of the motor magnetic circuit, reduce the air gap flux density of the motor, and reduce the power density of the motor; if the interference is too large, the temperature of the sheath heat sleeve will b...

AI Technical Summary

Problems solved by technology

If the sheath is too thick, it will increase the reluctance of the motor magnetic circuit, reduce the air gap flux density of the motor, and reduce the power density of the motor; if the interference is too large, the temperature of the sheath heat sleeve will be higher, and the permanent magnet will lose magnetism dangers and pitfalls

Or to prevent circumferential movement, add inlaid material between permanent magnets, which will reduce the power density of the entire motor

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