Numerical modelling of the coolant flow in a high-speed electrical machine

In the paper, a numerical modelling of the air-flow in a high-speed permanent-magnet electrical machine is presented. The method couples computational fluid dynamics and heat-transfer equations in order to estimate the turbulent and thermal properties of the flow. The machine under consideration is a high-speed PM motor that is designed for speed n = 31500 rpm and power P = 130 kW. The geometry of the fluid domain in this method is considered to be 2D axi-symmetric. At the end, results for the turbulent properties as well as for the temperature rises of the cooling fluid are presented.