The Effect Of Spray Parameter On Heat Dissipation In Spray Evaporatvie Cooling High Power Density Motors

With the increase of the electrical machines capacity and voltage level, the main insulation of the stator coil becomes thicker. Heat dissipation and voltage endurance becomes a contradiction. The traditional cooling, such as air-cooling and water-cooling, will not well meet design needs. New cooling methods with both advantages of good cooling effect and good insulation are in keen demand in industry. The spray evaporative cooling system should have the advantage of higher heat transfer efficiency, less power consumption and decreasing motor's weight. The paper aims to study how key spray parameters affect the heat transfer in the large electrical machines. The experimental result is the key reference for the motor cooling system optimization design.