Design and comparison between IM and PMSM for hybrid electrical vehicles

Considering the development and the prototype presentations of electrical and hybrid electrical vehicles over the last decade, one can see that several machine types were applied the direct current machine (DC), induction machine (IM), the permanent magnet synchronous machine (PMSM), and the switched reluctance machine (SRM). However many comparison study shows the IM or PMSM is suitable for hybrid propulsion system and this type of motor is mostly adopted in the automotive industry. The IM is generally adopted in the USA and Europe while on the other the PMSM is adopted in Japan. It is very hard to say which one is better but it depends on vehicle constraint, for example, output power, power density, efficiency, so on. In this paper, the two type of machine is compared in different output power. It shows the power density as increasing output power, and it discusses the critical issue of the iron loss according to the output power.