Minimization of energy dissipated in power mechatronic system by considering the electric conversion loss

The present paper discusses the minimization of dissipated energy including the electric conversion loss in a power mechatronic system. The motion equation and the dissipated energy of the system are formulated using the efficiency of a power transmission and the forward voltage drop of electric devices. Optimal velocity and current functions that minimizes the dissipated energy are solved by using the optimal control theory. Since the optimal functions are represented by zero crossing times for the torque and the current, the optimal zero crossing times are determined so that the dissipated energy can be minimized. The minimum dissipated energy is compared to those without considering the electric conversion loss. It is seen that the consideration of the electric conversion loss can further reduce the energy dissipated in the system.