An energy saving drive method of an induction motor with the suppression of sudden acceleration and deceleration

In order to drive the electric machines using the motors efficiently, the energy loss should be minimized during its operation. It has been reported that the design methodology of the optimal torque and rotating speed trajectories to minimize the energy loss of the induction motor (IM) drive systems when the operation time, rotating speed, and rotational angle are given as drive conditions. However, the optimal trajectory may cause sudden acceleration and deceleration. This paper proposes a design methodology of the optimal trajectories for IM drive system by means of the variational method and the S-curve trajectory. The effectiveness of the proposed method will be illustrated by means of some experiments and simulation.