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The performance requirement of a squirrel cage induction motor (IM) for application in electric vehicle (EV), with high efficiency, power factor and breakdown torque, is a challenging task for a machine designer. A new 5 hp wide speed operating range IM suitable for EV application has been designed here. The parametric study to analyse the effect of stator and rotor slot dimensions on different performance parameters has been carried out. This parametric study forms the basis of the multiobjective optimisation problem taken in this study. An evolutionary algorithm has been used for the IM design optimisation and its performance is compared to that of a conventional one. The optimised IM is then fabricated and tested in the laboratory to validate the simulation results.

This paper presents a new open-ended winding induction motor (OEWIM) based dual-motor differential fourwheel drive (D4WD) for the electric vehicle (EV). Constant speed operation through cruise control is achieved using direct torque control (DTC) algorithm. The redundant vectors are used in the switching vector selection of the DTC algorithm to achieve balanced battery currents. Fault-tolerant operation of the drive is demonstrated, where the EV will work with full torque even if one of the inverters in rear motor drive or front motor drive or both fail. The dynamic model of the proposed drive is presented. The proposed drive and fault-tolerant operation (FTO) is verified through simulation as per the FTP-75 driving cycle. An experimental prototype of the proposed drive is developed, and the above algorithms are verified experimentally as per the FTP-75 and HFET driving cycles. Both the simulation as well as the experimental results are presented, and these results agree with the theoretical observations. Stable operation of EV for the entire test cycle under normal operation, as well as inverter fault conditions, is demonstrated.

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