Loss Minimization Strategy for Induction Motor-Driven Electric Vehicles

Abstract

This chapter presents a loss model control (LMC) strategy for electric vehicles driven by poly-phase induction motors. The LMC is a widely used strategy for loss minimization of induction motor drives. The conventional LMC approach of reducing losses by minimizing the rotor flux/magnetizing current leads to surplus power loss caused by sudden increase in stator current during transient states. Therefore, to overcome the challenges, a new approach of LMC is presented for efficiency enhancement by equalizing the motor core losses and the copper losses. Furthermore, grasshopper optimization algorithm (GOA) is used to tune the PI controller that determines the optimal flux level for good efficiency. Compared with nominal flux operation, the proposed LMC is efficient, fast, and has smooth flux adaptation with high accuracy, versatile implementation, and can withstand transient mode. Simulation studies are performed on 5Hp IM using the proposed LMC method. The test results are provided and compared with the nominal flux method to validate the effectiveness of the proposed LMC.