Method of determination of parameters of heat exchangers of axial flux electric motors for electric vehicles

Introduction (problem statement and relevance). With the high competition for specific parameters, electrified vehicle manufacturers are making great efforts to create powerful and compact components. One of such solutions is the axial flux electric motor, the specific power of which is claimed by many companies to be over 6 kW/kg. Developments of such top companies as Whylot, YASA, AVID, Beyond Motors, Phi-Power only confirm the promising potential of this research trend. The purpose of the study is to investigate the thermal state of the axial flux electric motor and determine the heat transfer coefficient of alternative heat exchangers with lower hydraulic resistance. Methodology and research methods. The methods used are based on the fundamental principles of electronics and electrical engineering, hydrodynamics and heat transfer, methods of research testing and engineering analysis. Scientific novelty and results . Development of electric motors with high specific power of more that 6 kW/kg is considered to be promising, while cooling remains the main problem. According to the research results, a 3D model of the electric motor heat exchanger is obtained, which most satisfies the given requirements. Practical significance. Due to continuous increase in power density of this type of electric motors, it is necessary to improve the cooling efficiency. This paper is aimed at solving the issue of determining geometric parameters of the heat exchangers for the electric motors.