Sensorless speed control of permanent magnet synchronous motor based on novel adaptive control with compensated parameters

Recently, sensorless controls, which eliminate position and speed sensor in a permanent magnet synchronous motor (PMSM) drive, have been much studied. Most sensorless control algorithms are based on the back-electromotive force (back-EMF) and speed estimations which are obtained from the voltage equations. Therefore, the sensorless control performance is largely affected by the parameter errors of a motor. This paper investigates a new adaptive control with the parameter error compensation for the speed sensorless control of a PMSM. The proposed parameter estimation is obtained from the d-axis current error between the real and estimated currents. The proposed algorithm was verified through the simulation and experimentation.