Different Traction Motor Topologies Used in E-mobility : Part I: Solutions without magnet

Abstract

This paper presents a comparative study on different traction motor topologies that have the potential to be used in E-mobility applications. Some of the topologies, e.g. Interior Permanent Magnet (IPM) motors and Induction Motors (IM), are already driving vehicles on the road. In the paper first part, different induction motors and a Synchronous Reluctance Motor (SynRM) are discussed. Magnet-based traction motors are presented in the paper second part. The pros and cons of each design from performance to production and reliability points of view are explained and compared. Additionally, the operating principle together with the rotor structure of the IM and SynRM are detailed. On the induction motor, influence of using both the aluminium and copper in the rotor structure with two different frame sizes is studied. The performance parameters such as efficiency, power factor, torque density, field weakening, as well as the reliability and maturity are discussed. Experimental setup and measurement results on both these motor topologies are presented verifying accuracy of the simulation models used in this study.