Vector control strategy of induction motor based on iron loss model

To solve the problems of field orientation loss and performance degradation resulting from iron loss in the vector control system, a vector control strategy based on iron loss model of induction motor (IM) is proposed in this paper. In this strategy, a slip-type indirect field oriented vector control (IFOC) is designed by choosing alternatively the magnetizing currents as controlled variables directly, which allows decoupling control between the magnetizing and torque-producing components. Starting from the iron loss model of IM, the detrimental effects of the iron loss on the IFOC were analyzed, and a sliding-mode observer was invented to obtain the magnetizing currents. One of the merits pertinent to the proposed control strategy is that the iron loss representation appears neither in the observer nor in the vector control ontology, which benefits the implementation in practice. Simulation and experiments prove that the negative effects of neglecting the iron loss on the orientation and torque tracking are avoided in this proposed strategy, and the operation performance is improved consequently. © 2020, Harbin University of Science and Technology Publication. All right reserved.