A Non-Linear Technique for MTPA-Based Induction Motor Drive Considering Iron Loss and Saturation Effects

In this study, a novel maximum torque per ampere (MTPA) strategy based on backstepping controller is introduced for induction motor (IM) drives considering both iron loss and saturation effect. To achieve a perfect model for IM drives, inductances are accurately chosen in terms of magnetizing current by interpolating magnetizing flux curve. In addition, the MTPA strategy is performed with incorporating iron loss and saturation as major factors of current angle variations. In order to prove the stability of the control scheme, the Lyapunov control theory is used. By choosing both the MTPA realization criterion and rotor speed of IM as outputs, the proposed backstepping control converges the error signals to a small vicinity of zero. The simulation results are finally demonstrated to validate the proposed control structure.