Planetary Gearbox
Selecting/dimension gearboxes and important quantities
1FT6 Synchronous Motors
5-2 Configuration Manual, (PFT6), 10.2005 Edition, 6SN1197-0AD02-0BP1
Fig. 5-1 Dimensioning the gearbox
The load torque and the required traversing velocity define the gearbox drive-out torque, the
drive-out speed and therefore the drive-out power.
The required drive power is calculated from this:
P
out
[W] = P
mot
• η
G
= (π/30) • M
mot
[Nm] • n
mot
[RPM] • η
G
5.1.3 Dimensioning for S1 duty for naturally cooled systems
The gearbox itself generates heat due to friction and acts as a thermal barrier preventing heat
from being dissipated through the motor flange. This is the reason that the torque must be
reduced for S1 duty.
The required motor torque is calculated as follows:
Notice
Switching cycles can also be superimposed vibration! The supplementary factor (f
2
) is then
not sufficient when dimensioning the gearbox and gearboxes may fail.
The complete system should be optimized so that the higher-level vibration is minimized.
6\QFKURQRXVPRWRU
*HDUER[
L
Q
PRW
Q
$
Q
PRW
Q
$
M
V
Calculated "torque loss"
a π/3 for 1FT6/1FK motors supplied with sinusoidal current
b 0.5 weighting factor for gearbox losses (without dimensions)
n
mot
Motor speed [RPM]
k
T
Torque constant [Nm/A]
R
ph.
Motor phase resistance when warm [Ω] = 1.4 R
ph.
(list)
M
out
Gearbox drive-out torque [Nm]
i Gearbox ratio (i>1)
η
G
Gearbox efficiency
P
mot
Motor power [W]
P
out
Gearbox drive-out power [W]
M
mot
Motor torque [Nm]
SK
PRW
9
*
RXW
PRW
ZLWK
99
()
2
7
*
22
•
1
60
•b•a=)+
•i
(=
R
kn
MMM
M
M -
-
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