i'm trying to set up a thermal model of a permanent magnet synchronous electric motor. This by doing a lumped system analysis of the motor. In the thermal network that I've set up, I'm trying to introduce an equivalent thermal conductivity value (W/mK) for the copper conductors plus their insulation. This way I can introduce one thermal resistance in the network for the conductors in the stator.
The thermal conductivity of the insulation is 0.22 W/mK and the typical thermal conductivity of copper is 390 W/mK. Is there a way to get an average thermal conductivity value from these? Can I simply add them up and devide by 2?