Global Fluid-solid Coupling Analysis Of Ventilation And Cooling System Of Compact Medium-sized High-voltage Motor

With industrial upgrades and environmental constraints,the power density of the motor is continuously increasing.At the same time,the volume of the motor is required to be controlled within a certain size due to the needs of the application;this makes the cooling and heat dissipation capacity of the motor become more and more important.The design of the cooling and heat dissipation structure puts forward higher requirements,so it is very necessary to analyze and reasonably optimize the ventilation and cooling system of the motor.In this thesis,for the problem of compact medium-sized high-voltage motors with high power density and difficult to dissipate heat,a global fluid-structure coupling analysis of its cooling and ventilation structure is carried out.Taking a 6k V 2500 k W compact medium-sized high-voltage motor as an example,considering the structure and cooling method of the motor,the internal and external ventilated path are divided into 6 local decoupling zones including external fan,connection part,Cooling tube,fluid domain at the end of the winding,fluid domain of the stator and rotor core,and internal fan.A 3-D fluid-solid coupling model is established for them respectively,and the fluid flow data obtained by calculation will be effectively coupled into a globle fluid network of the motor.The fluid flow and heat transfer in the motor are obtained,and the simulation calculation results are compared with the experimental data.Verified the feasibility and accuracy of the program.On this basis,the shortcomings of the ventilation and cooling system found in the calculation and analysis are optimized,and the cooling and heat exchange capacity of the cooler is enhanced by changing the optimization of the inclined plate of the external ventilated path to an arc guide plate and increasing the number of windshield plates.The temperature at the entrance of the internal ventilated path is effectively reduced.The optimization measures of adding a wind deflector on the rotating shaft and adjusting its height and quantity make the fluid between the rotating shaft and the rotor more fully utilized,so that the fluid flows more reasonably along the rotor ventilation duct,and the optimized motor is carried out Analysis of temperature field and fluid field,and obtaining optimized measures can effectively reduce the temperature of the high temperature area of the motor.