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

Abstract

Background: In order to upgrade a motor based on the YXKK450-2 for high power density with high efficiency, low energy consumption, and low weight with the same volume, its power is increased from the original 900 kW to 1250 kW. To ensure good ventilation and heat dissipation characteristics, it is necessary to redesign the ventilation and cooling system of the entire machine. Methods: 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. The internal and external cooling systems of the motor were simulated, and the fluid flow law of the cooling system was realized. 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 calculating the flowheat coupling field were determined. The temperature rise trend and overall temperature distribution were obtained. Results: The results of the test resistance method were in good agreement with the numerical simulation test results, The temperature rise error was 4%, and the wind speed value error was 2.7%, all within allowable limits (<s5%), verifying the accuracy and effectiveness of the calculation method. Conclusion: An accurate prediction of motor temperature rise, fluid flow law, and temperature distribution is achieved.