| Abstract |
For a Permanent Magnet Synchronous Motor (PMSM) drive system, the instantaneous rotor position is needed to control the stator phase currents and the produced torque. The measured position is used also for position control or to derive the rotor velocity needed for speed control. This is normally achieved by using absolute position encoders or resolvers connected to the motor shaft. In this paper, the removal of this electromechanical sensor is considered. A stochastic filtering technique is presented to estimate the speed and the rotor position by only using measurements of the stator voltages and currents. The estimator is an Extended Kalman Filter algorithm which is suitable to be implemented with a digital signal processor for on-line operation. The laboratory implementation of a four-quadrant torque/speed controlled, sensorless drive system are carried out using the TMS 320C25 digital signal processor (DSP). The practical aspects of implementation are discussed and the experimental results are presented to demonstrate the feasibility of this approach. |
