Optimization of cooling structure and analysis of flow thermal performance for high-speed permanent magnet motor in hydrogen fuel cell air compressors

In order to investigate the impact of the cooling system design on the thermal dissipation performance of a high-speed permanent magnet synchronous motor (HPMSM), a 10-kW HPMSM for a hydrogen fuel cell compressor is taken as the research object. Drawing upon fluid mechanics and fluid-structure interaction heat transfer theory, multiple cooling water circuit configurations are designed, and their flow velocity, pressure, and temperature rise characteristics are compared to initially identifying the more superior structure. In this paper, the influence of the number of water channels and the cooling medium flow velocity on the fluid and temperature field are studied, revealing the cooling medium?s rheological behavior and temperature rise distribution under optimal conditions. Through simulation result comparisons and experimental verification, an optimal cooling structure is proposed to effectively optimize the temperature distribution and enhance cooling performance. This study offers theoretical support and engineering reference for cooling system design of HPMSM in hydrogen fuel cell air compressors.