Dynamic Modeling and Design of a Fractional Slot Overlapped Winding IPMSM for Light Electric Vehicle

Abstract

This work investigates the modeling of vehicle dynamics of two wheelers (2W) electric vehicle (EV) and electromagnetic performance of 3.2kW, 18 slot and 10 pole V type rotor interior permanent magnet synchronous motor (IPMSM) for the traction electric motor. The Worldwide harmonized Light vehicles Test Cycles (WLTC) Class 3 drive cycle is utilized to model the dynamics of vehicle. The electromagnetic performance is analyzed using the 2D finite element analysis (FEA) method. Modeling of vehicle dynamics for two wheelers is performed to obtain the required rating of electric traction motor to meet the mechanical performance of the vehicle. Moreover, this work further investigates key parameters of electromagnetic performance of an 18 slot and 10 pole fractional slot (FS) overlapping winding (OW) and compared their performances with conventional 12 slot and 10 pole fractional slot concentrated winding (FSCW) and 18 slot and 10 pole FS non-overlapping (NOW). It is found that, there is reduction in the torque ripple and cogging torque as well as the average electromagnetic torque improves in 18 pole and 10 pole OW IPMSM as compared with the conventional 12 slot and 10 pole FSCW and 18 slot and 10 pole non-overlapping winding (NOW). The V type interior permanent magnet (IPM) rotor is selected in this work.