Numerical investigation of turbulent kinetic energy and heat transfer performance of high-power-density permanent magnet synchronous motor

In the field of permanent magnet synchronous motors (PMSM) cooling, turbulent kinetic energy (TKE), and turbulent dissipation are used for the first time to numerically evaluate the heat transfer performance of axial water jackets, in order to investigate the influence of the water jackets structural parameters on the watercooled system of high-power-density PMSM (HPD-PMSM). In the present work, the temperature distribution and fluid-flow pattern of a 40 kW HPD-PMSM were calculated using the finite element method, and temperature testing of the HPDPMSM at different speeds using a built test platform. In addition, the effects of the bend shape of cooling channels (BSCC) on the axial water jackets performance for heat transfer are examined, and a detailed analysis of the mechanism underlying the development and evolution of high vorticity vortex is provided. The findings demonstrate that the TKE is attenuated by the positive vortex development, which is harmful to the TKE normal function in axial water jackets heat transfer. Furthermore, the maximum stator winding temperature was reduced to 93.49 degree celsius and the maximum flow velocity within the water jackets could be increased by 14.34% owing to the BSCC improvement.