Ultrahigh-speed permanent magnet motor

Abstract

The invention discloses an ultrahigh-speed permanent magnet motor, comprising a casing, and a group including a protective sleeve, a mandrel and a double-row cylindrical roller bearing which are disposed in the casing, wherein the protective sleeve is provided therein with a solid permanent magnet; the protective sleeve and the mandrel form a unitary structure; and the double-row cylindrical roller bearing is assembled on the mandrel. The ultrahigh-speed permanent magnet motor is characterized in that the inner wall of the casing is provided with an inwardly convex structure; the outer wall ofthe double-row cylindrical roller bearing is mounted on the inner wall of the inwardly convex portion of the casing. The invention, in view of the defects of a traditional rotor structure, provides an ultrahigh-speed permanent magnet motor with a small outer diameter, good concentricity, high rotation precision, high power density and good high-speed running performance.

Description

technical field [0001] The invention relates to the technical field of electric power transmission, in particular to an ultra-high-speed permanent magnet motor. Background technique [0002] High-speed motors have the characteristics of high power density, small moment of inertia, and can directly drive loads. As the core components of high-speed transmission systems, the structure, efficiency, reliability, and precision of motors determine the overall performance of high-speed transmission systems. The traditional high-speed motor rotor structure mainly has two types: surface mount type and three-stage type, respectively as figure 1 and figure 2 shown. The surface mount motor rotor structure consists of a permanent magnet, a mandrel and a protective sleeve. The rotor structure of the three-stage motor consists of a permanent magnet, a protective sleeve and two end shafts, and the two end shafts and the permanent magnet are connected together through the interference fit...

AI Technical Summary

Problems solved by technology

[0005] 2. The temperature of the rotor will rise due to wind mill loss and rotor eddy current loss

[0007] 1. The thermal expansion coefficient of the mandrel parts on both sides is usually higher than that of the middle permanent magnet. When the temperature rises due to windmill loss and rotor eddy current loss, the material of the mandrel on both sides expands faster than the middle permanent magnet material, which will Cause the sheath to reduce the protection ability of the permanent magnet;

[0008] 2. In the three-stage structure, the connection between the mandrels on both sides and the permanent magnet in the middle needs to ensure high concentricity, which requires extremely high processing and assembly of parts, which greatly increases the difficulty of processing and assembly

If the assembly accuracy of the three-stage structure is not high, it will seriously affect the performance of the motor at high speed

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