Characteristic Analysis of IPMSM for EV Traction Considering the Effect of Field and Armature Excitations on AC Copper Loss

Abstract

For high power density, a winding technology which has large conductor area such as hairpin winding has been adopted in interior permanent magnet synchronous motor (IPMSM) for applications such as electric vehicle (EV) traction. However, as the conductor area increases, the influence of AC copper loss should be considered. This paper presents the effect of AC copper loss caused by field and armature excitation on the characteristics of IPMSM. In order to calculate the AC copper loss due to field and armature excitation, a method of separating the AC copper loss using frozen permeability is presented. In addition, novel d, q-axis equivalent circuits are presented to consider the AC copper loss due to each cause in calculation of characteristics of IPMSM.