A multi-air-gap axial flux-magnetic field modulated permanent magnet motor

Abstract

The invention discloses a multi-air-gap axial magnetic flow-magnetic field modulation permanent magnet motor, which comprises a plurality of stators and a plurality of rotors, wherein the stators and the rotors are sequentially in staggered arrangement in the axial direction; the two ends of the permanent magnet motor are two surface-mounted permanent magnet rotors; the other rotors are embedded permanent magnet rotors; the structure dimensions of the plurality of stators are identical; the stators are subjected to two-edge grooving and use annular windings; and each stator sequentially deviates for the mechanical angle of the half groove distance relative to the former stator in the circumference direction. The multi-air-gap axial magnetic flow-magnetic field modulation permanent magnet motor realized according to the invention can comprehensively solve the inherent problems of magnetic field modulation motor torque density limitation and low power factor on the basis of remaining good performance of a magnetic field modulation motor.

Description

technical field [0001] The invention belongs to the field of direct drive motors, and more specifically relates to a multi-air-gap axial flux-magnetic field modulation permanent magnet motor. Background technique [0002] In recent years, permanent magnet traction motors have attracted extensive attention from researchers due to their advantages such as high efficiency, high power density, and strong overload capability. Countries such as Germany, France, Japan, and South Korea have all carried out research work, and some have entered the stage of engineering and commercial promotion and application. However, since the direct drive traction system requires the motor to achieve high torque output in a limited volume, it still has challenges in terms of torque density and motor heat generation. Compared with conventional motors, field-modulated permanent magnet motors can greatly increase the torque density, and have good application prospects in direct-drive traction systems...

AI Technical Summary

Problems solved by technology

However, due to the small number of poles of the stator of the magnetic field modulation motor (usually designed as four poles or six poles), the end of the winding is generally long, the copper consumption is high, and the index of the comprehensive torque density is severely limited by the length of the end winding

At the same time, due to the large flux leakage of the magnetic field modulation motor, the power factor of the conventional design is only 0.3-0.4, and most applications, such as direct drive traction such as rail transportation and ship propulsion, have higher requirements on the power factor of the motor

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