Pseudo Sensorless Control of PMSM

Pseudo sensorless permanent magnet synchronous motor torque and flux tracking control algorithm is presented. Proposed approach addresses the problem of operation at zero, low and up to nominal speed. The information of flux is extracted using a nonlinear closed loop rotor flux observer combined with the information obtained from hall sensors, which allows operation at zero speed. The analysis of the proposed method is included. Such control scheme was implemented on a DSP system and verified trough simulations and experiments.