Indirect rotor position sensing in real-time for brushless permanent magnet motor drives

The paper describes a modern solution to real-time rotor position estimation of permanent magnet (PM) motor drives. The estimation scheme, based on flux linkage and line current estimation, is implemented in real-time by using the abc reference frame, and it is tested dynamically, The position estimation model of the test motor, development of hardware and basic operation of the DSP are discussed, The overall position estimation strategy is accomplished with a fast digital signal processor (TMS320C30). The method is a shaft position sensorless method that is applicable to a wide range of excitation types in brushless PM motors without any restriction on the motor model and the current excitation. Both rectangular and sinewave excited brushless PM motor drives are examined and the results are given to demonstrate the effectiveness of the method with dynamic loads.