User Manual for BPS-i100
www.levitronix.com
PL-4036-00, Rev03, DCO# 21-057
3.4 Thermal Management
The driver temperature depends on the ambient and liquid temperature, as well as on the hydraulic operation
point and the cooling method. Figure 21, Figure 22 and Figure 23 illustrate the temperature characteristics of
the motor depending on these parameters. The below curves are measurements of the motor temperature at
certain liquid and ambient temperatures. Equation (Eq. 1) for convection cooling and (Eq. 2) for water cooling
show how to approximately calculate the motor temperature for other pumping liquid, ambient and cooling
liquid temperatures based on these curves.
(
(
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. 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 15°C safety distance to the
absolute thermal limit of the driver (80°C) when designing the thermal concept of the pump system. It is
recommended to avoid thermal stagnation in the room or cabinet where the driver is placed. Any type of
circulation decreases the driver temperature significantly.
Figure 21: Temperature curves for the IPD-100.2-50 driver @ 25°C liquid temperature
Note 1 Typical data for pumping with pump head LPP-200.7 and IPD-100.x drivers.
77
97
117
137
157
177
0.0 1.0 2.0 3.0 4.0 5.0
25
35
45
55
65
75
85
0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0
[°F]
[gallons/min]
[°C]
[liters/min]
Absolute Temperature Limit
Recommended Operational Temperature Limit
5000 rpm
6000 rpm
7000 rpm
8000 rpm
9000 rpm
4000 rpm
Specific gravity = 1 g/cm
3
Viscosity = 0.9 cP
Ambient Temp.: 25°C
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