A novel double-rotor parallel hybrid-excitation machine for electric vehicle propulsion

Abstract

A novel double-rotor parallel hybrid excitation machine with improved field adjustment capability is proposed in this paper. The key is to embed a stator electrical-excitation machine (SEEM) into the internal space of permanent magnet synchronous machine (PMSM) and the problem of magnetic field adjustment for conventional PMSM is effectively solved. This design integrates the merits of PMSM and SEEM, and provides high power density and a wide constant power speed range, thus making the proposed machine especially suitable for electric vehicle propulsion. In this paper, the selection, combination and design consideration for effective integration are investigated and verified by finite-element analysis.