Novel high torque density high power factor fault tolerant permanent magnet vernier machine and its modulation method

Abstract

The invention discloses a novel high torque density high power factor fault tolerant permanent magnet vernier machine and its modulation method. The vernier machine structure comprises a coaxial stator, an inner rotor and an outer rotor, wherein the permanent magnets of the inner rotor are distributed in a radial arrangement with their magnetization directions being tangential and their N poles and the S poles arranged in alternation. The permanent magnets of the outer rotor are arranged in a face embedding manner with their magnetization directions pointing to the center of circle. Ten smaller fault-tolerant teeth and ten bigger armature teeth are alternately arranged on the stator. The tops of each fault-tolerant tooth and the armature tooth are provided with a virtual slot, forming two virtual teeth. The armature windings adopt a single-layer concentrated winding manner in their winding. The invention utilizes the combination of a vernier machine, a magnetic gear and a fault-tolerant performance to further increase the motor torque outputting capacity on the basis of the vernier machine to achieve a more efficient utilization of the motor. This motor, with fault-tolerant performance, is ensured to provide reliable operations. Structured with a magnetic gear, the vernier machine can greatly enhance the motor power factor. The invention can increase the reliability of the motor operation and has great application prospects.

Description

technical field [0001] The invention relates to the fields of electric engineering, motor design and control, and electric vehicles, in particular to a five-phase high torque density high power factor fault-tolerant permanent magnet vernier motor. Background technique [0002] With the continuous consumption of non-renewable energy, the research and development of electric vehicles has attracted more and more attention. As the driving device of electric vehicles, the performance of electric motors directly affects the research and development of electric vehicles. key practical factors. [0003] Compared with traditional electric excitation motors and permanent magnet brushless DC motors, permanent magnet brushless AC motors have the advantages of high torque output capability, high efficiency, small size and high reliability. With the continuous update and improvement of permanent magnet materials, and the continuous proposal and optimization of new motor structures, the p...

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Problems solved by technology

[0005] In the existing technology, the permanent magnet vernier motor generally adopts three-phase fractional slot double-layer concentrated winding, and the number of slots per pole and phase is q=1 / 2. This winding scheme will make the winding factor low and the magnetic field utilization rate also low , and the phase-to-phase coupling degree is high, such a motor has poor fault-tolerant performance, or even has no fault-tolerant performance at all; and although the torque output capability of the vernier motor is greatly improved compared with ordinary motors, its own structure also has defects, and the power factor of the motor Low, which requires the power supply end to increase the capacity of the transformer, the resulting disadvantage is a substantial increase in the volume and weight of the motor system, which is not suitable for special applications

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