A Comprehensive Comparison of Concentrated Winding and Distributed Continuous Winding Machine Topologies for Hybrid Electric Vehicles

Abstract

This paper presents a detailed comparison between concentrated wound and distributed continuous wound machines for hybrid electric vehicles. For a fair comparison, both machines are optimized for their best performance using 2D finite element models. In a hybrid electric vehicle, the motor can be placed in various positions in the powertrain. In this paper, P1 and P2 positions are considered. In P1 and P2 applications, the packaging requirements dictate a disc-shaped, or low form factor for the machines, where the form factor is defined as axial length to outer diameter ratio. Thus, it is imperative for machine topologies to have short winding end turns. This study presents a comparison of the two winding topologies with different form factors. The comparisons are with respect to peak performance, continuous performance, efficiency, material weight and approximate cost. It was found that as the package length gets more constrained the concentrated machine has higher peak performance and efficiency, but the distributed wound machine has lower material weights and higher continuous performance.