Loss calculation and thermal analysis of a high-speed generator

The machine under study is a permanent magnet synchronous generator intended for operation at high speeds together with a micro-turbine in a combined heat and power (CHP) unit. Target power is 110 kW at 70000 rpm. The study is both theoretical and experimental since it includes calculation of loss distribution and thermal analysis together with calorimetric measurements of losses and temperature measurements. In this paper the loss calculations and thermal analysis part of the work is described. The experimental part is covered in an accompanying paper.