User Manual for BPS-2000
www.levitronix.com
PL-4021-00, Rev06, DCO# 21-037
3.4 Thermal Management
3.4.1 Motor Temperature
The motor temperature depends on the ambient and liquid temperature, as well as on the hydraulic
operation point and the characteristics (viscosity and density) of the liquid. Figure 19 illustrates typical
temperature characteristics for aqueous liquids at room temperature.
For higher liquid temperatures and hydraulic operating points active cooling is recommended for example
with the Air Cooling Module ACM-4.2 (see Figure 20), the Fan Cooling Module FCM-2000.1 (see Figure 21)
or with the motor with integrated water cooling (see Figure 22).
The curves Figure 19, Figure 20, Figure 21 and Figure 22 are values of the motor temperature at certain
liquid and ambient temperatures. For other liquid and ambient temperatures the equation (Eq. 1) with the
parameters in Table 11 can be used as an approximation to calculate the motor temperature.
(
(
(
Cooling
Method
Pump Head Type
Air Cooling Module
ACM-4.2
Fan Cooling
Module FCM-2000.1
Motor with integrated
Water Cooling
LPP-2000.7/14/22 (plastic housing)
LPP-2000.20 (stainless steel housing)
Table 11: Temperature gradients liquid/motor
All 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 and testing the
thermal concept of the pump system.
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