The above curves are measurements of the motor temperature at certain liquid and ambient temperatures.
Equation (Eq. 1) shows how to approximately extimate the motor temperature for other liquid and ambient
temperatures based on these curves.
Table 10: Temperature gradients liquid/motor
All above presented thermal data are typical values, which are partly based on measurements and partly on
interpolations with a simplified thermal model and are therefore only guideline values and are suitable for a
first layout of the basic thermal concept. It is recommended to check the thermal values with the motor
placed on the final location and under worst case performance conditions of the application.
In order to account for thermal variations (like ambient temperature, closed chemical cabinets or corners
without ventilations) and to not significantly reduce the MTBF of the motor it is recommended to keep about
10 to 20°C safety distance to the absolute thermal limit of the motor (90°C) when designing the thermal
concept of the pump system.
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