DC bias type flux reverse permanent magnet motor

Abstract

The invention discloses a DC bias type flux reverse permanent magnet motor, which comprises a permanent magnet stator and a salient pole iron core rotor. An independent air gap is formed between the permanent magnet stator and the salient pole iron core rotor; the permanent magnet type stator comprises a stator yoke part and a plurality of stator teeth, wherein the stator yoke part and the plurality of stator teeth form a plurality of stator slots; armature windings are placed in the stator slots; bias direct current is injected into the armature windings; a permanent magnet is arranged at theslot opening of each stator slot; the permanent magnets and the adjacent stator teeth form a pair of magnetic poles; and the number and the magnetizing modes of the permanent magnets at the slot openings of the stator slots are the same. Multi-harmonic simultaneous work of the stator armature windings can be achieved, motor magnetic field adjustment is achieved by controlling positive and negative injected direct currents, and the motor is quite suitable for high-power demand occasions such as wind power generation and electric vehicles.

Description

technical field [0001] The invention belongs to the field of motors, and particularly relates to a DC bias permanent magnet motor. Background technique [0002] Permanent magnet motors are widely used in industry, aviation, rail transit and other fields due to their high torque density, high power density and high efficiency. However, due to the complexity of operating conditions and other issues, the design of permanent magnet motors poses great challenges, such as the mechanical strength of permanent magnet rotors, high temperature demagnetization and weak field demagnetization. In recent years, due to the difficulty of heat dissipation of the inner permanent magnet rotor and the high-speed reliability of permanent magnets, stator permanent magnet motors (flux switching motors, flux reversing motors, etc.) extensive research. [0003] However, permanent magnet motors use permanent magnets as a single source of magnetic potential, which makes it difficult to adjust the ai...

AI Technical Summary

Problems solved by technology

The motor has the following disadvantages: the permanent magnet is located on the stator teeth, which increases the effective air gap of the motor, and the torque density of the motor is not high; in addition, due to the increase of the effective air gap, the inductance of the motor decreases, and the short-circuit current of the motor increases, which reduces the performance of the motor. Failure operation reliability

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