High-performance Halbach type permanent magnet rotor used for flywheel energy storage system

Abstract

The invention discloses a high-performance Halbach type permanent magnet rotor used for a flywheel energy storage system. The high-performance Halbach type permanent magnet rotor comprises a rotor shaft and a Halbach type permanent magnet array adhered onto the rotor shaft, wherein the Halbach type permanent magnet array is formed by arranging permanent magnet blocks magnetizing in radial directions and peripheral directions alternately, and the magnetizing directions change at 90 degrees in sequence; the bottom of each permanent magnet block is arc-shaped, and the diameter of the arc-shaped bottom of each permanent magnet block is smaller than that of the rotor shaft respectively. According to the high-performance Halbach type permanent magnet rotor used for the flywheel energy storage system disclosed by the invention, the bottom of each permanent magnet block is arc-shaped, actually the shapes of the permanent magnet blocks are locally adjusted on the basis of straight lines or oblique lines, and the harmonic content of the magnetic field distribution of the permanent magnet array is effectively reduced, so that the magnetic field distribution is more close to the shape of a sine; and meanwhile, the permanent magnet magnetomotive force can also be increased, the thermal parameters are reduced, and low loss and excellent electromagnetic performance of the motor are finally obtained.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a Halbach type permanent magnet rotor structure with a circular arc. Background technique [0002] The high-speed electric / generator integrated motor is the core component of the flywheel energy storage system. The rotors of traditional high-speed and high-power motors are almost all in the shape of tiles, which are easy to manufacture and simple in process, but usually only the thickness of the magnetic block and the arc coefficient of the pole can be adjusted when optimizing the design, which limits the improvement of the performance and utilization of the permanent magnets. Sometimes it is difficult Strike a balance among numerous optimization goals. [0003] When designing a high-speed electric / generator integrated motor, not only a large permanent magnet magnetomotive force is required to reduce thermal parameters such as thermal load and current density of the stator windin...

AI Technical Summary

Problems solved by technology

The rotors of traditional high-speed and high-power motors are almost all in the shape of tiles, which are easy to manufacture and simple in process, but usually only the thickness of the magnetic block and the arc coefficient of the pole can be adjusted when optimizing the design, which limits the improvement of the performance and utilization of the permanent magnets. Sometimes it is difficult Striking a balance among numerous optimization objectives

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