Convection heat transfer boundary conditions are applied on the exterior surfaces of the housing. Cooling coils, mounted in the engine housing, are also modeled using this boundary condition. Temperatures are specified on the adapter surfaces. The faces of the adapter surfaces that are covered with gaskets are modeled using the thin wall thermal resistance boundary condition. This special boundary condition allows for a thin layer of conducting material (the gasket) between the external boundary (the engine) and the fluid or conducting wall zones (the adapters) on the interior of the domain.  The circular bolt-connecting surfaces are described by constant temperature boundary conditions.  The stator surfaces are treated as external boundaries with a varying temperature in the radial direction.

Figure 2 shows contours of temperature on the shaft and motor housing.  The temperature contours illustrate the heat influx to these components from the engine. Contours of temperature on the rotor are shown in Figure 3. Higher temperature can be seen at the lower right corner (and to a lesser extent, the lower left corner) of the rotor. This is mostly due to heating from the shaft adapter, and partly due to the heat source that is included to represent frictional heating at the site of the shaft bearings. Temperature contours on the magnets are shown in Figure 4. They illustrate that the regions closest to the engine (lower right) receive inadequate cooling compared to those elsewhere.