Simultaneous thrust and attractive force control of linear induction motor driven by power source with frequency component synchronous with motor speed

In this paper, a novel maglev transportation system of the Linear Induction Motor (LIM) is introduced. It is proposed that two different frequency components are used to achieve the simultaneous and independent thrust and attractive force control of the LIM. One of the frequency components is synchronous with motor (f_m) that is used to control the levitation of LIM. The other frequency is drive frequency (f_d) that generates the traction force of LIM. The proposed control method makes the design of the controller more easily, because f_m frequency component produces only attractive force. Hence, the controller for thrust force and the controller for attractive force can be independent separately in the proposed system. This paper especially analyzes the proposed method by the simulation and the experimental results.