PMSM五电流矢量转子预定位方法研究

Research on Pre-positioning Method of PMSM Five Current Vector Rotor

永磁同步电机由于其诸多优点及良好的性能,而被应用于工业中。控制永磁同步电机通常利用矢量控制,而矢量控制的前提是确定转子的准确位置。在基于增量式编码器的永磁同步电动机的控制系统中,转子的初始位置检测是目前永磁同步电动机的控制系统的关键,针对这一问题,提出了一种五电流矢量转子预定位方法,该方法通过在永磁同步电机的定子中依次产生大小相等、方向固定的五个电流矢量,利用定子绕组电流与转子相互作用产生的电磁转矩,将转子拖动至设定位置实现转子预定位。最后,通过仿真对所提预定位策略进行了验证,并对增量式编码器安装误差造成I脉冲与A轴不重合的情况加以校正。

Permanent magnet synchronous motors are used in industry due to their many advantages and good performance.Controlling permanent magnet synchronous motors typically uilizes vector control,while vector control assumes the correct position of the rotor.In the control system of permanent magnet synchronous motor based on incremental encoder,the initial position detection of the rotor is the key of the current control system of permanent magnet synchronous motor.To solve this problem,a five-current vector rotor pre-positioning method is proposed.The method sequentially generates five current vectors of equal size and fixed direction in the stator of the permanent magnet synchronous motor,and uses the electromagnetic torque generated by the interaction between the stator winding current and the rotor to drag the rotor to the set position to realize the rotor reservation.Bit.Finally,the proposed pre-positioning strategy is verified by simulation,and the incremental encoder installation error is corrected when the I pulse does not coincide with the A-axis.