Heat Dissipation Characteristics and Experimental Research of Aviation Oil Cooling Motor Based on Spiral Insulation Flow Channel Structure in Slot

Modern aviation electric propulsion system puts forward higher requirements for the power density of the motor. From the perspective of electromagnetic energy conversion, improving the cooling capacity of the winding in the stator slot is the key to improving the power density. In this paper, the influence of current density on the power density of the motor is studied by thermal load analysis. A spiral insulation flow channel structure in the stator slot is proposed and the heat dissipation characteristics of the horizontal flow channel structure and the spiral insulation flow channel structure of the motor stator are compared. The single slot temperature measurement test platform of the motor stator is established to verify the accuracy of the heat dissipation characteristics of the winding in the slot under different spiral insulation flow channel structures. The variation law of the winding temperature increases with the increase of the insulation thickness and decreases with the increase of the flow channel width is obtained. Finally, the effect of increasing current density on power density is analyzed. The results show that the power density of the motor is increased by 16.3 % by using the spiral insulation flow channel structure. It provides a reference for the efficient cooling structure design of aviation propulsion motor.