Rotor Flux Barrier Design by Topology for Stress Reduction and Extended CPSR of IPMSM for EV Traction Motor

Traction motor for electric vehicles (EVs) requires high power and a wide operating area. Research on the expansion of the Constant Power Speed Range (CPSR) and the acceleration design has been researched actively. In this paper, sensitivity of parameters that determine rotor stress and CPSR for each rotor type (delta, V, double V) was analyzed for a rated 175kW EV traction motor. It was analyzed through the finite element method. As a result, the barrier design direction of IPMSM is proposed in consideration of both the electromagnetic field performance and the structural stability.