End effect braking force reduction in high-speed single-sided linear induction machine

Linear induction motors have been widely employed in industry because of their simple structure and low construction cost. However, they suffer from low efficiency and power factor. In addition, existence of so called end effect influences their performance especially in high speeds. The end effect deteriorates the performance of the motor by producing braking force. So, in this paper, by using Duncan equivalent circuit model, a new analytical equation is proposed to model end effect braking force. Employing the proposed equation and considering all phenomena involved in the single-sided linear induction motor, a simple design procedure is presented and the effect of different design variables on the performance of the motor is analyzed. A multi-objective optimization method based on genetic algorithm is introduced to maximize efficiency and power factor, as well as to minimize the end effect braking force, simultaneously. Finally, to validate the optimization results, 2D finite element method is employed.

► A new analytical equation to model the end effect braking force of SLIM is derived.
► Equations for efficiency, power factor and output thrust are analytically derived.
► The effect of design variables on the performance of the motor is analyzed.
► An optimization method is employed to minimize the end effect braking force (EEBF).
► The results show that EEBF is minimized by appropriate selection of motor parameters.