NE-Map-Based Design of an IPMSM for Traction in an EV

Abstract

This paper proposes a novel plot called an NE-Map that has two axes representing the no-load electromotive force (EMF) and the number of windings per slot. The NE-Map is applied to the design of an interior permanent magnet synchronous motor. Here, the design of the rotor is implemented using a magnetic equivalent circuit. In addition, the phase currents and current phase angles are estimated by considering the maximum torque per ampere and the flux weakening control method, and a stator is designed using this estimation. As these processes are presented in terms of the values of the EMF and the number of windings per slot, this representation allows for the verification of the relationship among the motor parameters and the determination of the final model by reflecting the design constraints. This process is applied to the design of a traction motor in hybrid EVs, and its validity is verified by comparison with finite element analysis and test data.