Research on Sensorless Control Technology of Switched Reluctance Motor Based on Sliding Mode Observer

Abstract

In order to detect the position of switched reluctance motor with high cost and complex structure, a sensorless control algorithm of Switched Reluctance Motor Based on sliding detector is proposed, and the position information of the motor is estimated. In this control technology, the deviation between the measured current and the estimated current is taken as the sliding surface, and the rotation speed and position are taken as the state variables. A sliding observer for estimating rotor speed and position is constructed. At the same time, in order to improve the anti jitter ability of the sliding observation system, the transition smooth saturation function is used. Taking 12 / 8 three-phase switched reluctance motor as an example, the switched reluctance motor model and sliding observer model are established in Matlab / Simulink. The simulation results show that the control method can effectively estimate the motor rotation speed and position, with small error, high tracking accuracy and good robustness.