Research on Control Methods of Six-phase Permanent Magnet Synchronous Motor

Abstract

Compared with three-phase motors, multi-phase motor speed control systems have many advantages, which make them have good prospects in many fields, such as the control system of electric vehicle power equipment. In these control systems, it is necessary for the motor to have a wider speed range. This paper takes six-phase permanent magnet synchronous motors as the research object, and analyzes several control methods of vector control theory for permanent magnet synchronous motor control based on the derivation of its mathematical model, including i d = 0 control, maximum torque per ampere (MTPA) control, and flux weakening control. Finally, MATLAB / Simulink is used for simulation research, and the advantages and disadvantages of different control methods are compared. In this paper, a strategy of MTPA control below the base speed and flux weakening control above the base speed is proposed, which not only reduces the copper consumption of the motor, but also expands the speed-up range of the permanent magnet synchronous motor.