Energy saving position control of PMSM drives with constant, linear and quadratic torques

The main contribution of this paper is complex solution of a new energy saving position control algorithm for PMSM drives loaded with composed load torque containing constant, linear and quadratic component. For minimization of energy losses a symmetrical trapezoidal speed-time profile based on prescribed maneuver time is analyzed to prescribe dynamics capable to reach demanded reference set-point. Overall control system designed for verification of energy saving exploits principles of vector control and forced dynamics control including load torque observation. A zero dynamic lag pre-compensator is included for precise tracking of prescribed state variables. Simulation results confirmed possibility to achieve energy savings for the pre-planned rest to rest maneuver with prescribed dynamics.