Axial flux motor of stator iron-core-free Halbach permanent magnet array

Abstract

The invention discloses an axial flux motor of a stator iron-core-free Halbach permanent magnet array. The motor includes two permanent magnet rotors, the rotors are mounted on a rotating shaft in the manner that permanent magnets of the rotors face each other, and a circular ring made of a high-molecular material is mounted between the rotors; radial guide grooves are regularly arranged in the circumferential directions of the front and back sides of the circular ring, and used for mount a stator winding coil with excitation lines; each permanent magnet rotor is composed of a magnetic conductive yoke of the rotor and a segmented permanent magnet mounted in the yoke; and 12 permanent magnets whose magnetizing directions are different from one another are mounted under each pair of poles, the axial magnetizing direction of the first permanent magnet is 0 degree, the difference between the magnetizing directions of the adjacent permanent magnets is 30 degree, and, thus, the Halbach array is realized, and the content of harmonic waves of air-gap flux density is greatly reduced. The axial flux motor has the advantages of high air-gap flux density sine degree, low winding loss, high structural intensity of the stator, good heat radiation effect, and high power / volume ratio.

Description

technical field [0001] The invention relates to a stator coreless Halbach permanent magnet array axial flux motor, which relates to the field of permanent magnet motors, in particular to a stator coreless permanent magnet motor. Background technique [0002] An axial flux motor is a motor with a flat air gap and an axial magnetic field direction. Because its shape is similar to a plate used in daily use, it is also generally called a disc motor. Due to the flat shape, compact structure and high torque density of axial flux motors, it has broad application prospects in electric vehicles, high-speed centrifuges, valve control, robots, etc. In particular, it should be pointed out that the large outer diameter of the axial flux motor rotor results in a large moment of inertia, so it has obvious advantages as a motor / generator in a flywheel energy storage system. It should be noted that the axial flux motor is easy to be combined from a single-stage axial cascade into a multi-st...

AI Technical Summary

Problems solved by technology

However, the air-gap flux density produced by these Halbach arrays still has a large harmonic content; moreover, for motors with fewer poles and larger dimensions, the number of permanent magnets per pole is less, and each permanent magnet The pole arc width is large, which is not conducive to the processing and magnetization of permanent magnets

[0007] In summary, although the stator coreless axial flux permanent magnet motor has the advantages of high efficiency and high torque density, it still has the disadvantages of poor stator manufacturing process, large harmonic content of the air gap magnetic field, large winding eddy current loss, and poor heat dissipation of the stator winding. and other shortcomings need to be overcome

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