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Torque optimization analysis with nonlinear models for main path saturation of induction machines

ZHU Dongqi, XU Dewei, JIANG Xinjian(Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)  
A new model is developed based on the MT synchronous rotating frame of induction machines with main path saturation. In this model, which was verified by finite element analysis, the saturated area was concentrated in the teeth and yokes near the M axis while the balanced rotor flux produced by the stator and rotor currents leads to a linear magnetic path on the T axis. Suitable conditions for the model are discussed with analysis of "cross saturation". Then the available torque density is calculated using the nonlinear model. The results show that the optimum rotor flux will improve the torque per ampere relative to the traditional constant flux control strategy.
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