In the case of DC motors, there is a thermal path from the motor windings to the motor case and a second thermal pass between the motor case and the motor environment (ambient air, etc.). A large cross section aluminum plate would have a very low thermal resistance, for example, while the values for air or a vacuum would be considerably higher.
Motor manufacturers typically provide an indication of the motor’s ability to dissipate heat by providing thermal resistance R thvalues. Thermal resistance (which is the reciprocal of thermal conductance) represents how well a material resists heat transfer through a defined path. The ease with which this heat can be dissipated in a motor (or any system) is defined by thermal resistance.
R losses in the coil is dissipated by thermal conduction through motor components and airflow in the air gap.
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