Optimization Design Of Cooler For Air-Air Cooled High-Voltage Asynchronous Motors

With the advancement of the times,motors are widely used in various fields.Motor failures can occur at any time due to heat generation.Therefore,the cooling performance becomes a very important issue,which will directly affect the service life of the motor.In order to ensure the safe and stable operation of the motor,it is essential to study the internal temperature field and fluid field of the motor.In this study,the air-to-air cooled high-voltage asynchronous motor is used as a prototype.According to the theory of fluid mechanics and heat transfer theory,the appropriate assumptions and boundary conditions are set according to the actual operation of the prototype.Firstly,numerical calculation is carried out for the internal fluid field and temperature rise of the motor,and the position with the highest temperature rise is found out,and the experimental verification is carried out,and this is used as the initial condition for the analysis and calculation of the external wind path.Then analyze the environmental factors that affect the temperature rise of the motor.On the one hand,the environment of the motor is changed.On the one hand,the temperature rise of the motor under different cooling flow rates and different ambient temperatures is studied.On the other hand,the influence of temperature rise on the insulation performance of the motor is studied.Reduce the importance of motor temperature rise.On this basis,the fluid characteristics and heat dissipation characteristics of the external air path of the motor are analyzed and calculated.Firstly,the external characteristics of the motor fan are analyzed and calculated.The analysis shows that the external fan is not efficient and the energy loss is serious.According to the empirical formula of the fan blade,the orthogonal test method is used to optimize the three structural parameters of the fan.Through comparative analysis,the optimal solution is selected to improve fan efficiency.Then analyze and calculate the fluidfield and temperature field of the cooler,and find that the heat dissipation effect is not ideal,and propose an optimization scheme.First,an air deflector is added at the inlet of the outer air passage of the cooler to evenly distribute the flow in the cooling tube bundle.Second,heat dissipating fins are added outside the cooler tube bundle,and the optimal material,form and size of the heat dissipating fins are selected through comparative analysis.And other structural parameters,select the optimization scheme that is most suitable for this prototype.Finally,the above optimization method is combined to seek an optimization scheme that can reduce the overall temperature rise of the motor.