Modeling and Simulation of Field Oriented Controlled Large Air-gap Linear Induction Motor

The large air gap linear induction motor (air gap length is greater than 10 mm) is well used in metro, light rail now, and also will have a nice future in Low-speed Maglev Vehicle. There are many differences between large air-gap linear induction motor and the small air-gap ones. It is necessary to do some research for the characteristics and driven technique of large air-gap linear induction motor. The paper introduced the DUNCUN equivalent circuit model for linear induction motor. By implementing FEM analysis of one large air-gap linear induction motor, the parameters for the DUNCUN equivalent circuit model were extracted. Then taking dynamic longitudinal end effect of this LEVI into consideration, the secondary flux oriented control simulation model of this LEVI is developed. Via simulation analysis, some of the key points about field oriented control was discussed. As a result, they can supply some good tips to driven system design of this kind of motor.