永磁同步电动机直接转矩控制策略研究

Research of direct torque control strategy of permanent magnet synchronous motor

研究了基于无速度传感器技术的永磁同步电动机直接转矩控制策略,该策略将空间矢量脉宽调制技术应用到了电压源逆变器的开关序列选择中;通过滞环控制器控制磁链和转矩,消除了脉宽调制的延迟;采用低通滤波器实现了电压和电流的谐波抑制。仿真结果表明,采用该策略后,电动机的实际速度与不同转矩响应下的预计速度相似,加速到参考速度所需的时间很短,跟踪也很好。

Direct torque control strategy of permanent magnet synchronous motor based on speed- sensorless technology was studied, and space vector pulse width modulation technique was applied in switching sequence selection of voltage source inverter. Delay of the pulse width modulation was eliminated through controlling of flux and torque by hysteresis controller, and harmonic suppression of voltage and current were achieved by use of low-pass filter. The simulation results show that actual speed of motor is similar to predicted speed under different torque responses after appling the strategy, the time needed by the motor to accelerate to desired reference time is very short, and the tracking is also good.