Analysis of Fluid Field and Temperature Field of Permanent Magnet Synchronous Motor for Special Vehicles

Abstract

To study the distribution law of the internal flow field and temperature field of permanent magnet synchronous motor (PMSM) for special vehicles, this paper takes a PMSM with a rated power of 300KW as an example, which adopts the cooling structure combined with the spiral channel of the housing and the fan of the rotating shaft. Based on computational fluid dynamics (CFD) and heat transfer theory, a three-dimensional full-domain simulation model of the motor was established. The finite volume method was used for numerical calculation and analysis of the motor's flow field and temperature field, and the fluid flow characteristics of the spiral channel and the air in the motor and the temperature distribution characteristics of each component were analyzed. The wind resistance moment of the rotor surface was calculated based on CFD, and the wind friction loss was obtained according to the relationship between the wind resistance moment and the wind friction loss. Finally, experimental tests were conducted on the prototype, and the experimental results data were compared with CFD simulation calculation results to further calibrate the PMSM flow field and temperature field simulation calculation model, which provides some reference and practical engineering value for wind friction loss calculation, cooling system design and temperature field simulation calculation of PMSM for special vehicles.