Mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor and winding switching magnetism-weakening control method thereof

Abstract

The invention discloses a mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor and a winding switching magnetism-weakening control method thereof. The mixed permanent magnetic pole-alternating and magnetic flux-switching memory motor comprises a salient rotor and a stator, wherein the stator contains stator cores, aluminium-nickel-cobalt permanent magnets, neodymium-iron-boron permanent magnets, centralized armature windings and pulsed magnetism-adjusting windings; iron core edges of two adjacent outer U-shaped units and tangentially-magnetized long-stripped neodymium-iron-boron permanent magnets form a first permanent magnetic pole, while the circumferentially-inward (outward) and parallel-magnetized V-shaped embedded aluminium-nickel-cobalt permanent magnets and inner U-shaped units form a second permanent magnetic pole; mixed magnetic poles are in alternating polarity distribution; when the motor runs at a low speed, the pulsed magnetism-adjusting windings are in direct-current pulsed working state, while in a high-speed weak-magnetism area, the pulsed magnetism-adjusting windings are converted into alternating-current armature windings. Requirements on performance in a low-speed area and in the high-speed area can be met at the same time; influence of an armature reaction field on the aluminium-nickel-cobalt permanent magnets with low coercivity is small; the utilization rate of permanent magnetism, the torque density, and the reliability of system operation are high.

Description

technical field [0001] The invention relates to a hybrid permanent magnet magnetic pole alternating magnetic flux switching type memory motor and a winding switching magnetic field weakening control method, belonging to the field of adjustable magnetic flux permanent magnet motors. Background technique [0002] In the field of motors, due to the inherent characteristics of ordinary permanent magnet materials (such as NdFeB), the air gap magnetic field in the motor is basically kept constant, and the range of speed regulation is very limited when operating as an electric motor. The application of wide-speed adjustable direct drive applications such as electric vehicles and aerospace is limited to a certain extent. Therefore, the adjustable flux permanent magnet motor aimed at realizing the effective adjustment of the air gap magnetic field of the permanent magnet motor has always been a hot spot and difficulty in the field of motor research. . Permanent magnet memory motor (...

AI Technical Summary

Problems solved by technology

However, this kind of motor has two magnetic potential sources at the same time, and the magnetic fluxes of the two are easy to couple and influence each other, which increases the complexity of electromagnetic characteristics, and has weaknesses such as increased excitation loss and difficulty in implementing the excitation current control system.

[0008] Patent CN200910196558.0 discloses a doubly salient pole memory motor. For the first time, the concept of "memory motor" is integrated into the stator permanent magnet motor to achieve efficient online magnetic adjustment, but the motor only uses low coercive force aluminum Nickel-cobalt permanent magnets, and based on the double-saliency operation mechanism, the motor has a unipolar flux linkage and a back EMF close to the trapezoidal wave, which makes the torque density and torque ripple of the motor larger, and the industrial applicability is poor. In addition, The armature slot area of ​​the motor is smaller than that of the pulse winding slot, which greatly reduces the power density and force performance of the motor

In short, the above-mentioned hybrid excitation and memory motors generally have the problems of large magnetic capacity and low torque density. Therefore, a memory motor with high torque density is proposed for industries such as wind power generation, new energy vehicles, and multi-electric aircraft\ships. domain has significant significance

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