Position-measuring error analysis and solution of hall sensor in pseudo-sensorless PMSM driving system

Referring to a PMSM (permanent magnet synchronous motor) driving system with only two low-cost hall sensors, this paper analyses the position-measuring error in one pseudo-sensorless scheme, and offers methods of error compensation. Adopting the methodology based on 3-d finite element analysis, this paper evaluates and practically locates the mounted positions of hall sensor in the PMSM to minimize the position-measuring error. Finally, experiments are carried out to verify the corresponding 3-d finite element analysis results.