User Manual for PuraLev
®
600SU
www.levitronix.com
PL-4032-00, Rev06, DCO# 20-144
16
Figure 20: Influence of liquid temperature on motor temperature
(Typical measurement data at 7000 rpm 23 l/min but gradients are representative for other operational points.)
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 𝟏𝟔
+ (𝑻
𝑳
− 𝟐𝟓 °𝑪) ∙
𝒕𝒈
𝑳𝑴
⏟
𝒔𝒆𝒆 𝑭𝒊𝒈𝒖𝒓𝒆 𝟐𝟎
+ (𝑻
𝑳
− 𝟐𝟓 °𝑪)
𝑻
𝑴
= 𝑴𝒐𝒕𝒐𝒓 𝒕𝒆𝒎𝒑𝒆𝒓𝒂𝒕𝒖𝒓𝒆
𝑻
𝑳
= 𝑳𝒊𝒒𝒖𝒊𝒅 𝒕𝒆𝒎𝒑𝒆𝒓𝒂𝒕𝒖𝒓𝒆
𝑻
𝑨
= 𝑨𝒎𝒃𝒊𝒆𝒏𝒕 𝒕𝒆𝒎𝒑𝒆𝒓𝒂𝒕𝒖𝒓𝒆
𝒕𝒈
𝑳𝑴
= 𝑻𝒆𝒎𝒑𝒆𝒓𝒂𝒕𝒖𝒓𝒆 𝒈𝒓𝒂𝒅𝒊𝒂𝒏𝒕 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
20
0
C
safety distance to the absolute thermal limit of the motor (90
0
C
) when designing the thermal concept
of the pump system.
y = 0.61x + 31.02
y = 0.36x + 27.21
y = 0.26x + 30.37
77
97
117
137
157
177
197
77
87
97
107
117
127
137
25
35
45
55
65
75
85
95
25
30
35
40
45
50
55
60
[°F]
[°F]
[°C]
Liquid Temperature in [°C]
Ambient Temp = 25
C
Specific gravity = 1 g/cm3
Viscosity = 0.7 cP
Absolute Temperature Limit
No Active Cooling:
Temperature Gradiant = 0.61
(Liquid vs. Motor Temperature)
Air cooling with ACM-600.2
(
1bar, ~20 C air)
Temperature Gradiant = 0.36
(Liquid vs. Motor Temperature)
Air cooling with FCM-600.1
Temperature Gradiant = 0.26
(Liquid vs. Motor Temperature)