iming at reducing the difficulty of cooling the interior of high-density motors

this study proposed the placement of a water cold plate cooling structure between the axial laminations of the motor stator. The effect of the cooling water flow

thickness of the plate

and motor loss density on the cooling effect of the water cold plate were studied. To compare the cooling performance of water cold plate and outer spiral water jacket cooling structures

a high-speed permanent magnet motor with a high loss density was used to establish two motor models with the two cooling structures. Consequently

the cooling effects of the two models were analyzed using the finite element method under the same loss density

coolant flow

and main dimensions. The results were as follows. (1) The maximum and average temperatures of the water cold plate structure were reduced by 25.5% and 30.5%

respectively

compared to that of the outer spiral water jacket motor; .(2) Compared with the outer spiral water jacket structure

the water cold plate structure can reduce the overall mass and volume of the motor. Considering a 100 kW high-speed permanent magnet motor as an example

a water cold plate cooling system was designed

and the temperature distribution is analyzed

with the result indicating that the cooling structure satisfied the cooling requirements of the high loss density motor.