Motor rotor and permanent magnet motor

Abstract

The invention provides a motor rotor and a permanent magnet motor, which are characterized in that the motor rotor and the permanent magnet motor comprise a rotating shaft; A magnetic lay is fixedly sleeved on that rotate shaft; A first heat diffusion layer coated on the outer surface of the magnetic layer on the side away from the rotating shaft for preventing the shielding layer from locally overheating; A shield layer coated on a surface of the first thermal diffusion layer on a side remote from the magnetic layer. A first thermal diffusion layer is arranged between the shield layer and themagnetic layer of the rotor of the motor. The first thermal diffusion layer can prevent the shield layer and the magnetic layer from overheating locally and improve the heat dissipation efficiency ofthe shield layer.

Description

technical field [0001] The invention relates to the field of motors, in particular to a motor rotor and a permanent magnet motor. Background technique [0002] High-speed permanent magnet synchronous motor has many advantages such as high power density, good dynamic response and simple structure, and has become one of the research hotspots in the international electrotechnical field. However, the permanent magnets in the rotor generally use sintered NdFeB permanent magnet materials, because this permanent magnet material is compressive and not tensile. In order to ensure that the permanent magnet has sufficient strength at high speed, a high-strength rotor sheath is generally wrapped around the permanent magnet. The rotor sheath and the permanent magnet adopt an interference fit to ensure that the permanent magnet still bears a certain compressive stress when it is working. So as to ensure the safe operation of the high-speed motor. [0003] There are two commonly used she...

AI Technical Summary

Problems solved by technology

Carbon fiber cannot shield the harmonic field entering the permanent magnet, so there will still be a lot of eddy current losses in the permanent magnet

When a metal sheath is used, the metal sheath will generate eddy current loss under the action of a high-frequency electromagnetic field, which will cause the sheath to heat up, and because the sheath is in close contact with the permanent magnet of the rotor, the heat in the sheath is easily transferred to the permanent magnet.

When the permanent magnet temperature rises too high, irreversible demagnetization will occur, which will reduce the performance of the motor or even damage it

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