Improved flux linkage method for position sensorless control of high-speed SRM

Traditional simplified flux linkage method is not suitable for the control of high-speed and super-highspeed SRM drives. In this paper, a high-speed SRM position sensorless control strategy based on an improved simplified flux linkage method to estimate the rotor position is proposed. This method has the capability of timely adjust the phase turn-on/off angle at different speeds and can extend the maximum achievable speed for a constant DC-bus voltage. The principle of selecting the reference flux linkage on the basis of the SRM current-flux model to improve the precision of rotor angular position estimation is presented. The proposed control strategy is experimentally tested in two different SRM drives and the results show its feasibility, reliability and effectiveness, both for low- and high-speed SRM.