A d.c. motor position drive system can be operated using conventional position, speed and current control or advanced methods such as feed-forward or torque control. These control methods provide good dynamic and stationary performances, but they do not take into consideration the conversion’s efficiency. The objective of the paper is to develop a new control law, optimal type, which minimizes the consumption energy used to perform a given position trajectory and also provides acceptable dynamic and stationary performances. The synthesis of the optimal energetic control law is accompanied by a comparison between two control methods, conventional and optimal, and by two proposals for implementation. The simulation results that assess the performances of the proposed control method are also presented.

Keywords: Optimal control, Energetic criteria, D.C. position drive system