The heat flux due to the windage loss associated with the drag on the shaft is ˙q = 5 × 104 W/m2 and is imposed on the internal surface of the laminations. The outer surface of the motor is exposed to air at T∞ = 20◦C with a heat transfer coefficient h = 40 W/m2-K. There is a contact resistance R c = 1 × 10-4 K-m2/W between the outer surface of the laminations and the inner surface of the plastic and the outer surface of the plastic and the inner surface of the motor housing. Determine an upper and lower bound for the temperature at the inner surface of the laminations (Tin).
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