Energy Optimal Control of PMSM Drive for Time-Varying Load Torque

Abstract

Speed and position controller respecting principles of energy optimal control for the drives with permanent magnet synchronous motor and time varying load torque are developed as a contribution to the energy saving and environmental protection. Two approaches to the energy saving controller design are analyzed and compared. The first one is strictly based on energy optimal control theory and derives analytical solutions of the control problem. The second approach for comparison presents approximated solution for the drive’s position controller when the optimal speed trajectory is modified to trapezoidal profile. Results are verified by simulation.

Euler-Lagrange optimization of electric drives with DTM method

“…The main contribution of this paper is a mathematical analysis of the energy optimal speed and position control of the drives with a permanent magnet synchronous motor (PMSM), taking into account stator copper losses. In [1,2] the optimal mathematical trajectory is modified to correspond to the triangular and trapezoidal profiles. This procedure is necessary for the technical realization of the near-energy optimal control to any controlled drive with PMSM.…”