Optimization Design and Experimental Study of Cooling System in a High Voltage Induction Motor after Power Density Upgrade

Abstract

background: In order to meet the high power density upgrade design of the motor with high efficiency, energy saving and light weight under the same space size, based on the YXKK450-2 motor, its power is increased from the original 900kW to 1250kW. In order to meet the good ventilation and heat dissipation characteristics, it is necessary to redesign the ventilation and cooling system of the whole machine. method: Based on the finite volume method, a physical model of the entire flow field of the motor's inner and outer air passages was established, through the numerical simulation calculation of the internal and external cooling system of the motor, the fluid flow law of the cooling system is obtained; by extracting the pressure difference between the inlet and outlet of the cooler and the circulating cooling air velocity in the inner air passage, the boundary conditions for the calculation of the flow-heat coupling field are determined. The temperature rise trend and overall the temperature distribution were obtained. result: Results and Conclusion: The test shows that the test results of the type test resistance method are in good agreement with the numerical simulation test results, The temperature rise error is 4%, and the wind speed value error is 2.7%, all within the engineering allowable error (<5%), which verifies the accuracy and effectiveness of the calculation method. Accurate prediction of motor temperature rise, fluid flow law and temperature distribution is achieved. conclusion: Results and Conclusion: The test shows that the test results of the type test resistance method are in good agreement with the numerical simulation test results, The temperature rise error is 4%, and the wind speed value error is 2.7%, all within the engineering allowable error (<5%), which verifies the accuracy and effectiveness of the calculation method. Accurate prediction of motor temperature rise, fluid flow law and temperature distribution is achieved.