Method for analyzing magnetic potential of non-sine power supply multiphase motor

Abstract

The invention belongs to the technical field of motor analysis design, and discloses a method for analyzing magnetic potential of a non-sine power supply multiphase motor. The method includes the steps that the concepts of equivalent positive sequence currents and equivalent inverted sequence currents are imported, a synthetic forward circular rotating field and a synthetic inverted circular rotating field are seen as being generated by the equivalent positive sequence currents and the equivalent inverted sequence currents respectively, subharmonic currents are indicated as current phasors in an index mode, on the basis of magnetic potential equivalence, harmonic equivalent sequence currents corresponding to the subharmonic magnetic potential are acquired, and then corresponding space harmonic forward magnetic potential and inverted magnetic potential are directly solved. The method is based on the electro mechanics fundamental principles, the concept is clear, complex calculation of superposing the subharmonic magnetic potential of all phases in a traditional method is avoided, the method is suitable for analyzing the magnetic potentials of the multiphase motor under multiple working conditions, and when default phases or asymmetrical windings or asymmetrical currents or other failures occur, only corresponding elements in a current matrix or a winding spatial position matrix need to be changed.

Description

technical field [0001] The invention belongs to the technical field of motor analysis and design, and more specifically relates to a magnetic potential analysis method of a multi-phase motor with non-sinusoidal power supply. Background technique [0002] Multiphase motors have many advantages such as high reliability, high power density and high torque density, and have become the focus of research on electric propulsion motors at home and abroad. In order to overcome the shortcoming that the iron core is not fully utilized in the sinusoidal power supply motor, the stator of the multi-phase motor can use full-pitch concentrated windings and be powered by a non-sinusoidal power supply, so that the harmonic magnetic potential can be utilized and the utilization rate of the motor iron core can be improved. and torque density. In multiphase motors injected with harmonic currents, the analysis of the air-gap magnetic field is the basis for the effective use of harmonic magnetic ...

AI Technical Summary

Problems solved by technology

Especially when a non-sinusoidal power supply multi-phase motor has a phase loss fault, the air gap magnetic potential will change with the fault situation. The existing magnetic potential analysis method cannot provide a simple and unified calculation process. This is a new method for the invention of magnetic potential analysis. The root cause of the method

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