Temperature prediction and cooling structure optimization of explosion-proof high pressure water-cooled double speed motor

In this paper, a 200/400 kW, 750/1500 r/min coal conveyor with explosion-proof type high pressure cooling double speed motor as an example, according to its structure feature, type of cooling and heat transfer characteristics, a global fluid flow and heat transfer network model is established with motor-CAD software, The temperature of stator winding, casing and water jacket outlet at two speeds of the motor are calculated respectively, The validity of the method is proved by experiments. On this basis, the water-cooling system is optimized, and the influence of different water flow and number of channels on the cooling effect is compared and analyzed. The results show that the cooling effect is the most ideal when the water flow is 0.004 m3/s, and the lowest temperature of the stator winding is 115.09 °C when the number of channels is 35. The influence of existing water jacket and circumferential spiral channel on temperature rise is compared and analyzed, and the latter is found to be more conducive to heat dissipation. At last, the heat transfer coefficient and flow resistance of each part are analyzed comprehensively under various water-cooling conditions, and it conclude that the circumferential spiral waterway is the most reasonable when its width is 40 mm.