High-performance control of PMSM based on a new forecast algorithm with only low-resolution position sensor

The high performance drives of the permanent magnet synchronous motor can be achieved by vector control. In such high performance drive system, a high resolution position sensor is desired. In this paper, a new forecast algorithm is proposed to predict the position and speed of the rotor with only a low accuracy sensor, which is used instead of a conventional high-resolution position sensor. The new algorithm estimates the rotor position by detecting the rotor speed and acceleration in the previous interrupted cycle of position signal. Simulation and experimental results show that the algorithm can estimate the rotor position successfully and realize the vector control. The system is shown to remain stable and accurate while the motor is uniform, speed up and slow down.