Levitronix BPS-2000.1 User Manual page 21

77 87
95
85
75
No Active Cooling:
Temp. Gradient = 0.49
65
0
[ C]
55
45
Active Cooling with ACM-4.2:
Cooling Pressure = 1 bar
Temp. Gradient = 0.29
35
25
25 30 35
Figure 23: Influence of liquid temperature on motor temperature
(Measurement at 6000 rpm 50 lpm with LPP-2000.7, but gradients are representative for other operational points and the same for LPP-2000.6)
The above curves are measurements of the motor temperature at certain liquid and ambient temperatures.
Equation (Eq. 1) shows how to calculate the motor temperature for other liquid and ambient temperatures
based on these curves.
 
T ( T , T ) T ( T
  
M L A M L

T Motor temperatur
M

T Ambient temperatur
A
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
10 to 20°C safety distance to the absolute thermal limit of the motor (90°C) when designing the thermal
concept of the pump system.
PL-4021-00, Rev02, DCO# 15-235
97 107 117 127
40 45 50
Liquid Temperature in [°C]
 
0 0
25 C , T 25 C ) (
       
A
see Figure 21
e T
e tg
[°F]
137 147 157
Ambient Temp = 25 C
Specific gravity = 1 g/cm3
Viscosity = 0.7 cP
Gradients measured for 6000 rpm /50
l/min but representative also for other
flows and speeds
55 60 65
 
0
T 25 C ) tg

L LM
see Figure 23

Liquid temperatur
L

Temperatur e
LM
User Manual for BPS-2000
www.levitronix.com
167 177 187
70 75 80 85
 
0
( T 25 C )
A
e
gradient liquid/mot or
197
177
157
[°F]
137
117
97
77
90
(Eq. 1)
21