电动助力转向电机控制系统死区效应研究

Research on the Dead-Time Effect of Electric Power Steering Motor Control System

在汽车电动助力转向(EPS)系统中,逆变器的死区问题是影响转向电机输出性能的主要因素,表现为电流谐波含量增加,引发电机转矩脉动,增加电机附加损耗。双三相永磁同步电机采用2套定子绕组相移30°结构,通过双d-q坐标变换控制使6次谐波电流含量降低,电磁转矩总谐波含量减小。仿真结果验证了所提方法的正确性和有效性。

In automotive electric power steering(EPS)system,the dead-time problem of the inverter is the main factor affecting the output performance of the steering motor,which is manifested by an increase in the current harmonic content.The dead-time problem causes motor torque ripple and increases the additional loss of the motor.The dual three-phase permanent magnet synchronous motors adopt two sets of stator windings with 30°phase shift.The content of the sixth harmonic current is reduced by the double d-q coordinate transformation control,and the total harmonic content of electromagnetic torque is reduced.Simulation results show that the proposed method is correct and effective.