Analysis of magnetic features in IPMSM used for EV considering PM - flux barrier interaction and excitation current

Abstract

This paper analysis the magnetic features including flux linkage and air-gap flux density in interior permanent magnet synchronous motor (IPMSM) with delta-shaped PM used for electric vehicles (EVs). Research motor models are based on the motor of Nissan Leaf called EM61 taken from experiment reports, and the analysis is based on finite element analysis (FEA). The analysis is performed by adjusting the existence of permanent magnets (PMs) and flux barriers (FBs) as well as the amplitude and phase angle of excitation current which affect the torque production, phase flux linkage, and air-gap flux density under two temperature conditions. Through this analysis, the influence of each object, its position (i.e., the inner and outer layer of PM and FB), and PM-FB interaction on the magnetic features of IPMSM are expressed. The role of these PM-FBs on magnetic features also helps to point out some indications for engineers when designing an IPMSM.

Keywords

• ipmsm
• delta-shaped pm
• phase flux linkage
• air-gap flux density