Abstract：With the acceleration of global energy transition, electric vehicles have become the core development direction of the automotive industry due to their zero emissions and high efficiency. The drive motor, as the “power heart” of an electric vehicle, directly affects the energy efficiency and reliability of the entire vehicle. In specific application scenarios, new energy vehicles have more stringent requirements for the volume and weight of the drive motor. High efficiency, high power density, and a compact structure are required, and the drive motor is continuously developing towards higher voltage and frequency. However, this development leads to increased AC losses and excessive temperature rise, which directly affects the operating efficiency and service life of the motor. Therefore, temperature management of the drive motor for new energy vehicles is of vital importance. Currently, there is no comprehensive summary and conclusion for suppressing the temperature rise of new energy vehicle drive motors. Thus, this paper reviews the types and characteristics of new energy vehicle drive motors, summarizes the key technologies of thermal design and thermal management, and looks forward to their future development trends and directions. The solutions for effectively reducing the loss density of the drive motor are summarized, as well as the suppression of the heat source, heat generation, and temperature rise. The suppression technologies for copper loss in the stator winding and stator core are discussed, with emphasis on the development of flat-wire motor winding and high-frequency AC loss reduction technologies. Then, the cooling system optimization methods for enhancing the heat dissipation capacity and their cooling effect are summarized. The casing, stator core, stator winding, and rotor cooling technologies are analyzed. In addition, the advantages, disadvantages, and application scope of cooling technologies are compared. This paper elaborates on the development of key technologies for drive motors in new energy vehicles, including their types and characteristics, thermal design technologies, and thermal management technologies. It also summarizes the future development trends of drive motors for new energy vehicles, including the permanent magnetization of drive motors, flat-wire winding for permanent magnet motors, non-crystalline/nanocrystalline treatment of the permanent magnet motor core, and permanent magnet motors with oil-cooling systems.
汪冬梅, 李思义, 梁艳萍. 新能源汽车驱动电机热设计与热管理技术研究综述[J]. 电工技术学报, 2026, 41(2): 389-415.
Wang Dongmei, Li Siyi, Liang Yanping. Comprehensive Review of Thermal Design and Thermal Management Technologies for New Energy Vehicle Drive Motors. Transactions of China Electrotechnical Society, 2026, 41(2): 389-415.
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2026, Vol. 41 
