Thermal Model

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Thermal Model

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If we combine all components we get the complete thermal model. It can be represented as shown in the figure below.


The values for thermal capacities and resistances can be found in most data sheets. These values are, however based on general conditions. The value of the thermal resistance Rhousing-amb can vary considerably, based on the specific mounting of the motor and use of passive or active cooling. Most motor suppliers will indicate the how the thermal parameters were derived and how the motor should be mounted to meet the general conditions.