Comparative Study of Outer Rotor Field Excited Flux Switching Machine with Feasible Rotor Poles For EV and HEV Application

Abstract

This paper proposes a novel Outer Rotor Field Excited Flux Switching Machine (OR-FEFSM) for electric and hybrid electric vehicles. First, the design topology and operating principles is discussed. In order to investigate the effectiveness of the proposed OR-FEFSM, a detailed study on rotor pole combinations is performed. Based on simplified mathematical formulation, 12S/7P (stator slot/rotor poles), 12S/11P, 12S/13P and 12S/17P are the most feasible combination. Moreover, the developed OR-FEFSM offers improved average torque and ripples. Finite Element Analysis (FEA) based on comprehensive electromagnetic performance are opted on the aforesaid combination and found that 12S/13P offers the highest average torque of 4.62 Nm whereas 3.72 Nm, 2.72Nm, and 2.103 Nm average torque are offered by 12S/17P, 12S/7P and 12S/11P respectively.