Siemens SIMOTICS T-1FW6 - Page 161

Technical data and characteristics
6.1 Explanations of the formula abbreviations
1FW6 Built-in torque motors
Configuration Manual, 07/2017, 6SN1197-0AE00-0BP9
159
Data for main motor cooler
Q
H,MAX
Maximum thermal power that is dissipated by the main cooler when the motor is
utilized up to the rated torque M
N
and at the rated temperature T
N
.
H,MIN
Recommended minimum volume flow rate in the main cooler to achieve the rated
torque M
N
.
ΔT
H
The temperature increase of the cooling medium between the inlet and return flow
circuit of the main cooler at the operating
point Q
H,MAX
and
H,MIN
can be estimated
with the following formula:
average density of water: ρ
= 1000 kg/m
3
average specific thermal capacity of water: c
p
= 4.18 · 10
3
J/(kg K)
Temperature change with
respect to the intake temperature: ΔT
H
in K
volume flow rate: in m
3
/s
Figure 6-2 Sample characteristic "Temperature increase of the coolant between the inlet and return
flow circuit of the main cooler"
Δp
H
Coolant pressure drop between the inlet and return flow circuit of the main cooler
with volume flow
H,MIN
.
The main and precision coolers for motors with integrated cooling are connected in
parallel. The volume flow rates of the main and precision cooler are added to
cre-
a
te a total volume flow rate; the pressure drop in the main cooler Δp
H
corresponds
to the pressure drop in the precision cooler Δp
P
.