The above curves are measurements of the motor temperature at certain liquid and ambient temperatures.
Equation (Eq. 1) shows how to calculate the motor temperature for other liquid and ambient temperatures
based on these curves.
Table 8: Temperature gradients liquid-to-motor temperature (in °C/°C)
(Typical values based on measurements and interpolations.)
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
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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