Research on Sensorless Control of Rail Transit Interior Permanent Magnet Synchronous Motor Based on Improved Luenberger Observer
A sensorless vector control based on Luenberger observer was designed for the problem that cannot meet the high-performance sensorless control of the interior permanent magnet synchronous motor(IPMSM)for rail transit due to the IGBT switching frequency is restrict-ed.The voltage equation of the motor is changed into a full-order model based on the extended back electromotive force,and on this basis,the design of the Luenberger observer is carried out.The stability of the system is analyzed theoretically,and the parameter design method is given.In order to adapt to the application environment of low switching frequency,the observer model is designed with fourth-order discretization to improve the accuracy of the observer.Using a permanent magnet synchronous motor as the control object,experimental verification was con-ducted using the designed sensorless control.The experimental results show that the torque control accuracy of the designed sensorless control based on the Luenberger observer is within 2%,and the system has good dynamic characteristics of load sudden changes.
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