Investigation of a Double-Stator Consequent-Pole Dual-PM Machine for Electric Vehicle Propulsion

Abstract

In this article, a double-stator dual consequent-pole-PM machine (DS-CDM) is proposed for electric vehicle (EV) propulsion applications, and the harmonic contributions analysis and various comparative studies are conducted. The proposed machine adopts the double stator to eliminate the space conflicts, significantly improving the torque density and efficiency, and utilizes dual consequent-pole PMs in the two stators to generate multiple working harmonics to achieve high torque density. This article first establishes a magnetomotive force (MMF)-permeance model with a combination of stator-PM and rotor-PM machines to investigate the working principle of the proposed machine with dual consequent-pole PMs. Then, the proposed machine is optimized by the multiobjective genetic algorithm (MOGA), and the harmonic contributions to back EMF and average torque of stator-PM and rotor-PM machines are analyzed, and compared with the machine with conventional N-S PMs. Furthermore, various comparison studies with two existing double-stator machines are conducted, and the average torque and efficiency can be elevated by 32.9% and 3.0%, respectively. Finally, a prototype of the proposed machine is fabricated to validate the effectiveness of the proposed machine.