User Manual for BPS-iF100
www.levitronix.com
PL-4037-00, Rev02, DCO# 21-057
16
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.
and
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
for water cooling
show how to approximately calculate the motor temperature for other pumping liquid, ambient and cooling
liquid temperatures based on these curves.
𝑇
𝑀
(
𝑇
𝐿
𝑇
𝐴
) ≈ 𝑇
𝑀
(𝑇
𝐿
= 25°𝐶, 𝑇
𝐴
= 25°𝐶)
⏟
𝑠𝑒𝑒 𝐹𝑖𝑔𝑢𝑟𝑒 21
+ (𝑇
𝐿
− 25°𝐶) ∙
𝑡𝑔
𝐿𝑀
⏟
0.51
𝑓𝑜𝑟 𝑐𝑜𝑛𝑣𝑒𝑐𝑡𝑖𝑜𝑛
𝑐𝑜𝑜𝑙𝑖𝑛𝑔
+ (𝑇
𝐴
− 25°𝐶)
𝑇
𝑀
=
𝑀𝑜𝑡𝑜𝑟 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑇
𝐴
=
𝐴𝑚𝑏𝑖𝑒𝑛𝑡 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑇
𝐿
=
𝐿𝑖𝑞𝑢𝑖𝑑 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑡𝑔
𝐿𝑀
=
𝑇𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 𝑔𝑟𝑎𝑑𝑖𝑒𝑛𝑡 𝑙𝑖𝑞𝑢𝑖𝑑/𝑚𝑜𝑡𝑜𝑟
(Eq. 1)
𝑇
𝑀
(
𝑇
𝐿
𝑇
𝐶𝐿
) ≈ 𝑇
𝑀
(𝑇
𝐿
= 90°𝐶, 𝑇
𝐶𝐿
= 20°𝐶)
⏟
𝑠𝑒𝑒 𝐹𝑖𝑔𝑢𝑟𝑒 23
+ (𝑇
𝐿
− 90°𝐶) ∙
𝑡𝑔
𝐿𝑀
⏟
0.44
𝑓𝑜𝑟 𝑤𝑎𝑡𝑒𝑟 𝑐𝑜𝑜𝑙𝑖𝑛𝑔
𝑤𝑖𝑡ℎ 𝑊𝐶𝑀−𝑖30.2
+ (𝑇
𝐶𝐿
− 20°𝐶)
𝑇
𝑀
=
𝑀𝑜𝑡𝑜𝑟 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑇
𝐶𝐿
=
𝐶𝑜𝑜𝑙𝑖𝑛𝑔 𝑙𝑖𝑞𝑢𝑖𝑑 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑇
𝐿
= 𝑃𝑢𝑚𝑝𝑖𝑛𝑔 𝐿𝑖𝑞𝑢𝑖𝑑 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑡𝑔
𝐿𝑀
= 𝑇𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 𝑔𝑟𝑎𝑑𝑖𝑒𝑛𝑡 𝑙𝑖𝑞𝑢𝑖𝑑/𝑚𝑜𝑡𝑜𝑟
(Eq. 2)
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 18: 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 IFD-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
