A High Torque Density Multi-disc-Multi-Gap Axial Flux Magnetic Field Modulated Permanent Magnet Motor

Abstract

The invention provides a multi-disc and multi-gap axial flux magnetic field modulation permanent-magnet motor with high torque density. The permanent-magnet motor has a multi-disc and multi-gap structure and comprises a plurality of stators and rotors, which are sequentially arranged in a staggered manner along the axial direction; if the number of the stators is Ns and the number of the rotors is Nr, the stators and the rotors meet the following expression: Ns=Nr+1 (Nr=2, 3, 4 ...); no winding is placed on two stators at the outmost side; and annular windings are placed on the stators at the inner side. According to the modulation permanent-magnet motor provided by the invention, the lengths of the end parts of the windings are reduced; the copper loss of the motor is reduced; the efficiency is improved; with the outer stators at two sides as auxiliary magnetic circuits, the characteristics of high electromagnetic torque density, high power factor and the like of the magnetic field modulation motor are reserved; and the overall torque density of the motor is improved. Meanwhile, the outer stators at two sides can be directly connected with a machine case, so that modulation permanent-magnet motor is easy to assemble.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors, and more specifically relates to a high torque density multi-disk-multi-air gap axial flux magnetic field modulation permanent magnet motor. Background technique [0002] Field-modulated permanent magnet motors have the advantages of low cogging torque and torque ripple, small counter electromotive force harmonics, high electromagnetic torque density, and saving magnets, etc., and have attracted the attention of researchers since they were proposed. Compared with conventional motors, due to its unique magnetic field modulation effect, the magnetic field modulation motor can modulate the multi-pole magnetic field of the rotor into a few-pole magnetic field in the stator yoke through modulation units such as modulation rings or stator teeth, and has low-speed and high-torque work characteristics. However, due to the small number of stator poles of the magnetic field modulation motor, the win...

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Problems solved by technology

[0003] Aiming at the lack of performance of existing magnetic field modulation motors, the present invention proposes a high torque density multi-disk-multi-air gap axial flux magnetic field modulation permanent magnet motor, which is used to solve the problem of high copper consumption and low overall torque density of the motor shortcoming

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