DETERMINATION OF THE INITIAL ROTOR POSITION ANGLE OF SEPARATELY EXCITED SYNCHRONOUS MACHINES

摘要

A method of determining the initial rotor position of separately excited synchronous machines with salient pole or cylindrical rotor for variable speed applications is presented. It requires an inverter which successively applies three different voltage space vectors of short duration to the stator phases, while the field winding remains short-circuited. From the phase currents response and the sign of the field current the rotor position can be computed very quickly and precisely by employing the microprocessor of the system. Measurements confirm the accuracy pf the algorithm.