Real-time estimation of rotor position in PM motors during transient operation

The paper describes a modern solution to real-time rotor position estimation, which has been the subject of intense research activity for the last 15 years. The previously proposed position estimation scheme based on flux linkage and line current estimation, is implemented in real-time. The overall position estimation strategy is accomplished with a fast digital signal processor, DSP (TMS320C30). The drive, the position estimation model of the test motor, development of hardware, and basic operation of the DSP are discussed. It has been confirmed in experiments that the estimated position tracks the actual position in real-time. As well as eliminating the mechanical shaft position sensor, the investigated method can be used for high performance torque control of brushless PM motors