Regarding position-sensorless control for permanent magnet synchronous motor(PMSM)in the full-speed range,the high-frequency injection method during the zero-low speed stages can cause torque ripple,noise and other issues.To address this,a no-vel approach of IF control combined with zero voltage vector current differentiation(ZVVCD)was proposed to achieve motor operation in zero-low speed range.This approach was further enhanced by integrating an improved sliding mode observer,thereby achieving the position-sensorless control objective throughout the full-speed range.During the zero-low speed stages,the motor was started using the IF control and switched to ZVVCD at low speed.This approach could effectively reduce speed fluctuations and enhance control precision.In the medium-high speed stage,a continuously smooth Sigmoid function and extended Kalman filter were used to improve the sliding mode observer,reducing system oscillations and improving speed stability.During the speed transition stage,a weighted switching function with adjustable slope was designed to achieve a smooth transition between the two control methods for zero-low speed and medi-um-high speed.The experimental results demonstrate that the proposed composite control strategy can achieve position-sensorless con-trol for PMSM across the full-speed range,the torque fluctuations are effectively eliminated,the rotor speed and position information are accurately identified,and rapid dynamic response and good steady-state performance are exhibited.
关键词
永磁同步电机/IF控制/零电压矢量电流微分法/改进滑模观测器法/无位置传感器复合控制
Key words
permanent magnet synchronous motor/IF control/zero voltage vector current differentiation/improved sliding mode observer/position-sensorless composite control
维普
万方数据