User Manual for PuraLev
®
iF30SU
www.levitronix.com
PL-4078-00, Rev00, DCO# 20-228
15
The above curves are measurements of the motor temperature at certain liquid and ambient temperatures.
Equation
shows how to calculate the motor temperature for other liquid and ambient temperatures
based on these curves.
𝑇
𝑀
(
𝑇
𝐿
𝑇
𝐴
) ≈ 𝑇
𝑀
(𝑇
𝐿
= 25°𝐶, 𝑇
𝐴
= 25°𝐶)
⏟
𝑠𝑒𝑒 𝐹𝑖𝑔𝑢𝑟𝑒 17
+ (𝑇
𝐿
− 25°𝐶) ∙
𝑡𝑔
𝐿𝑀
⏟
0.59
𝑓𝑜𝑟 𝑐𝑜𝑛𝑣𝑒𝑐𝑡𝑖𝑜𝑛
𝑐𝑜𝑜𝑙𝑖𝑛𝑔
+ (𝑇
𝐴
− 25°𝐶)
𝑇
𝑀
=
𝑀𝑜𝑡𝑜𝑟 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 [°𝐶]
𝑇
𝐴
=
𝐴𝑚𝑏𝑖𝑒𝑛𝑡 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 [°𝐶]
𝑇
𝐿
=
𝐿𝑖𝑞𝑢𝑖𝑑 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 [°𝐶]
𝑡𝑔
𝐿𝑀
=
𝑇𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒 𝑔𝑟𝑎𝑑𝑖𝑒𝑛𝑡 𝑙𝑖𝑞𝑢𝑖𝑑/𝑚𝑜𝑡𝑜𝑟
(Eq. 1)
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
15°C safety distance to the absolute thermal limit of the driver (80°C) when designing the thermal concept of
the flow control 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.
