Investigation of new rotor cooling structure optimization in MW high-speed permanent magnet motor
When there is no forced cooling measures on the rotor side of the MW high-speed permanent magnet motor,the rotor side temperature rises and the risk of permanent magnet demagnetization is high.Based on this problem,a new axial ventilation structure was proposed with reinforced ribs,which can im-prove the wall heat transfer coefficient on the rotor wall,enhance the heat transfer capacity of the rotor side,and reduce the temperature of the motor.A three-dimensional global fluid-solid coupling solution model was established for a 1 MW,18 000 r/min high-speed permanent magnet motor,and the fluid field and temperature field of the motor were analyzed based on computational fluid dynamics and finite ele-ment method.The distribution of fluid and temperature of the motor under rated working conditions was revealed.The heat dissipation performance and temperature rise change of the new cooling structure was compared with that of the traditional cooling structure,and feasibility of the proposed new cooling struc-ture in improving the heat dissipation performance of the motor was verified.Finally,the effect of inlet wind speed on the maximum temperature of the motor was analyzed,and the suitable inlet wind speed range for this cooling structure was obtained,providing theoretical support for the selection of external wind pressure equipment.
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