High-Efficiency e-Powertrain Topology by Integrating Open-End Winding and Winding Changeover for Improving Fuel Economy of Electric Vehicles

Kyoung-Soo Cha, Jae-Hyun Kim, Sung-Woo Hwang, Myung-Seop Lim () and Soo-Hwan Park ()
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Kyoung-Soo Cha: Advanced Mobility System Group, Korea Institute of Industrial Technology, Daegu 42994, Republic of Korea
Jae-Hyun Kim: School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
Sung-Woo Hwang: Department of Automotive Engineering, Hanyang University, Seoul 04763, Republic of Korea
Myung-Seop Lim: Department of Automotive Engineering, Hanyang University, Seoul 04763, Republic of Korea
Soo-Hwan Park: Department of Mechanical, Robotics, and Energy Engineering, Dongguk University, Seoul 04620, Republic of Korea

Mathematics, 2024, vol. 12, issue 21, 1-19

Abstract: The fuel economy of electric vehicles (EVs) is an important factor in determining the competitiveness of EVs. Since the fuel economy is affected by the efficiency of an e-powertrain composed of a motor and inverter, it is necessary to select a high-efficiency topology for the e-powertrain. In this paper, a novel topology of e-powertrains to improve the fuel economy of EVs is proposed. The proposed topology aims to improve the system efficiency by integrating open-end winding (OEW) and winding changeover (WC). The proposed OEW-PMSM with WC enables to drive a permanent magnet synchronous motor (PMSM) in four different modes. Each mode can increase inverter efficiency and motor efficiency by changing motor parameters and maximum modulation index. In this paper, the system efficiency of the proposed topology was evaluated using electromagnetic finite element analysis and a loss model of power semiconductors. In addition, the vehicle simulations were performed to evaluate the fuel economy of the proposed topology, thereby proving the superiority of the proposed topology compared with the conventional PMSM.

Keywords: electric vehicles; fuel economy; open-end winding; permanent magnet synchronous motors; winding changeover (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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