SENSORLESS ROTOR-POSITION DETECTION FROM ZERO TO RATED SPEED FOR AN INTEGRATED PM SYNCHRONOUS MOTOR DRIVE

By integrating the motor, the converter and the control circuits of el ectrical drives into one casing several advantages are obtained. The d rive becomes compact, the amount of wiring is significantly reduced, a nd the control of the inverter and the motor can be designed to better utilize their respective characteristics. The paper presents an integ rated permanent magnet synchronous motor drive (IPMSM) using complete digital control. The control includes a simple sensorless estimation o f the rotor position both at standstill and at rotation. The algorithm for the initial rotor position detection is based on the saliency of the rotor at no load and it provides both the location as well as the direction of the magnetization. At rotation the rotor position is esti mated by a predictor-corrector-based observer. The integrated concept makes it simple to include accurate values of the machine parameters.