Simulation of sensorless drive for surface mounted PM machine based on comprehensive machine model

In this paper a comprehensive mathematical model of surface mounted permanent magnet synchronous machine (SPMSM) is developed, in which the nonlinear inductance is expressed a composite function of the rotor position and the stator current. With all the parameters identified experimentally, the new model incorporates both the structural and the saturation saliencies. A sensorless drive system is proposed and simulated based on the comprehensive mathematical model. High frequency carrier signals are injected to the stator windings to detect the rotor axis position and additional DC voltage pulses are added to identify the rotor magnetic polarity based on the saturation effect in the stator core. With the estimated rotor position information, the SPMSM drive system is developed based on the vector control and simulated by using MATLAB/SIMULINK.