Permanent magnet crossed type axial magnetic field magnetic flow switching type memory motor

Abstract

The invention discloses a permanent magnet crossed type axial magnetic field magnetic flow switching type memory motor. The permanent magnet crossed type axial magnetic field magnetic flow switching type memory motor comprises two stators with convex pole structures and a rotor with a convex pole structure, wherein the structures of the two stators are the same and the two stators are marked into a first stator and a second stator respectively; the positions of the stators are opposite; the rotor is coaxially arranged between the two stators; each stator comprises a U-shaped magnetism-conductive iron core, a permanent magnet, a three-phase armature winding and a direct-current magnetizing winding; the permanent magnets comprises a high coercivity permanent magnet A and a low coercivity permanent magnet B; the iron cores and the permanent magnets are peripherally and alternatively arranged to form a circular ring shape; the two permanent magnets are alternatively arranged, and the magnetizing directions of the adjacent permanent magnets are opposite; the magnetizing directions of the permanent magnets on the corresponding positions of the two stators are opposite; columnar rotor teeth are uniformly arranged on a non-magnetism-conductive annular rotary shaft along the peripheral direction. The memory motor adopts a mixed permanent magnet excitation manner and has higher torque density; the flux weakening is carried out through adjusting the magnetizing level of the low coercivity permanent magnet, and the flux weakening capability and constant-power operation efficiency of the memory motor are improved.

Description

Technical field [0001] The invention relates to a permanent magnet interleaved axial magnetic flux switching type memory motor. Background technique [0002] Permanent magnet synchronous motors have been widely used in industry, aerospace and other fields due to their advantages of high power density, high efficiency, and simple structure. However, due to the limitation of the characteristics of the permanent magnet material, the traditional permanent magnet motor has the problems that the air gap magnetic field is difficult to adjust, and it is difficult to achieve a wide speed range. With the development of permanent magnet materials and permanent magnet motors, more and more household appliances and electric vehicles are driven by permanent magnet motors. The motors in these devices need to run at variable speeds. When running at low speeds and low torques, they consume more iron. In high-speed operation, due to the inverter voltage limitation, field weakening control is gene...

AI Technical Summary

Problems solved by technology

The double salient pole structure of the traditional flux switching motor makes the cogging torque larger and the torque performance is poor

The flux switching motor adopts the stator permanent magnet structure. As a permanent magnet motor, there is also the problem that the air gap magnetic field is difficult to adjust.

When the motor is running at low speed and low torque, the iron consumption of the motor is large; when the motor is running at high speed, the traditional method uses direct-axis demagnetization current or a separate field-weakening winding to maintain the field-weakening operation, just like other types of permanent magnet motors , there is a problem of large weak magnetic loss

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