Temperature Field Research Of Permanent Magnet Synchronous Traction Motor

With the rapid development of high-speed railway and the emergence of highperformance permanent magnet materials, the research and application ofpermanent magnet traction motor in the field of rail transportation is increasinglywidespread. Permanent magnet traction motor has the advantages such as highefficiency, high power factor, small volume and low noise that traditionalasynchronous traction motor can not be comparable, which makes it has a gooddevelopment prospect in the application of locomotive traction. However, due tothe small volume, high power density and limited installation space of permanentmagnet traction motor, if the heat in the motor can not be dissipated in time,permanent magnet traction motor will have the risk of lose magnetism. Therefore,the depth research in temperature field distribution of permanent magnetsynchronous traction motor is particularly important.In this paper, a600kW permanent magnet synchronous traction motor wastaken as an example. Based on the theory of fluid mechanics and heat transfer,and combined with the ventilation structure of the motor, fluid field andtemperature field coupled model is established. The fluid flow and temperaturecoupled field was calculated using the finite volume method, by which thetemperature distribution within the motor was obtained. The temperaturedistribution of stator core, stator windings, rotor core and permanent magnet wasanalyzed in-depth, and the location of the highest temperature rise in the tractionmotor is determined. The simulation temperature rise and the measured result arecompared, the accuracy of the calculation results is verified. On this basis, thesensitivity factors that affecting the temperature distribution of the motor wasanalyzed, which provide theoretical reference for the design of permanent magnettraction motor. To further reduce the temperature of the motor, the ventilation structure of the permanent magnet traction motor was optimized. Fluid field andtemperature field in different schemes were simulated, and calculation results inthe different schemes were compared and analyzed, from which the optimalventilation scheme was found out.