A novel field oriented control for parallel-connected double-sided LIM

The long primary double-sided linear induction motor (LIM) has been used in industry. To improve the system efficiency and reduce the drive inverter capacity, the primary parallel connection with segment powered drive has been adopted in the drives consist of long primary double-sided LIMs. But, the LIMs parameters may vary with the position of the secondary, and it results in the thrust ripple. In this paper, a deduced voltage-current model is derived by simplifying the multi-motor stator flux into an average one and then the equivalent circuit with average parameter is obtained. Besides, this paper proposes a novel direct thrust control (DTC) based thrust feedback control method with thrust observer to eliminate the effects from motor parameters changes and to obtain a stable output thrust during acceleration. The control results verify the effectiveness of the method during the load acceleration.

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