Rotor structure of magnetic levitation ultra high speed permanent magnet motor

Abstract

The invention relates to a rotor structure of a magnetic levitation ultra high speed permanent magnet motor. The rotor structure comprises a thrust disc shaft, a sheath, a permanent magnet, a shaft, a first magnetic bearing assembly and a second magnetic bearing assembly, wherein the thrust disc shaft comprises a left shaft and a thrust disc, the thrust disc is a solid structure, the portion of the thrust disc shaft contacting with the permanent magnet is a hollow structure, the permanent magnet is a cylindrical structure, and the thrust disc and the left shaft are integrated into body and are prepared from a magnetic conduction metal material with high yield strength. The position corresponding to the thrust disc is must a solid structure, the maximum centrifugation stress can be reduced by half, the portion of the thrust disc shaft contacting with the permanent magnet is must the hollow structure, so the short circuit effect on a permanent magnet magnetic field can be reduced; the other portion of the thrust disc shaft is made to be a hollow structure, so weight of the shaft is reduced; the thrust disc and the partial hollow shaft are the integrated structure, the maximum stress of the center of the thrust disc can be substantially reduced, rotor linear velocity and rotor dynamics characteristics of the magnetic levitation ultra high speed permanent magnet motor are improved, and bearing capability of the magnetic bearing is further reduced.

Description

technical field [0001] The invention relates to the technical field of magnetic levitation ultra-high speed, in particular to a rotor structure of a magnetic levitation ultra-high speed permanent magnet motor. Background technique [0002] The cross-sectional view of the mainstream structure of the current maglev ultra-high-speed permanent magnet motor is as follows: figure 1 As shown, its main disadvantages are: [0003] (1) The shaft is a solid structure, and non-magnetic materials must be used, such as non-magnetic stainless steel, to avoid short-circuiting of the magnetic field at the contact between the permanent magnet and the shaft. When the magnetic field is short-circuited, a huge magnetic flux leakage will occur, thus weakening the The effective magnetic field of the permanent magnet; [0004] (2) The shaft is a solid structure with heavy weight, which leads to excessive bearing capacity of the magnetic bearing and high volume and weight; [0005] (3) The thrust...

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Problems solved by technology

[0003] (1) The shaft is a solid structure, and non-magnetic materials must be used, such as non-magnetic stainless steel, to avoid short-circuiting of the magnetic field at the contact between the permanent magnet and the shaft. When the magnetic field is short-circuited, a huge magnetic flux leakage will occur, thus weakening the The effective magnetic field of the permanent magnet;

[0004] (2) The shaft is a solid structure with heavy weight, which leads to excessive bearing capacity of the magnetic bearing and high volume and weight;

[0005] (3) The thrust plate must be made of magnetically conductive material, which is different from the material of the shaft, so the thrust plate can only be made into a hollow disc, which is fitted on the non-magnetically conductive shaft through profit matching

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