Siemens SINAMICS S120 Configuration Manual page 67
Synchronous motors
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J
M
J
G
J
load
n
Load
i
η
G
M
load
M
R
T
A; E
t
e
∆t
The RMS torque M
The maximum torque M
For synchronous motors, M
For induction motors, M
In summary, the motor is selected as follows:
Figure 5-9
Synchronous Motors 1FK7
Configuration Manual, (PFK7S), Edition 12.2006, 6SN1197-0AD16-0BP1
Motor moment of inertia
Gearbox moment of inertia
Load moment of inertia
Load speed
Gear ratio
Gearbox efficiency
Load torque
Frictional torque
Cycle time, clock cycle time
Initial value, final value in time slice Δ
ON period
Time interval
i
must lie below the S1 curve.
rms
max
max
Selecting motors depending on the load duty cycle (example)
is produced during the acceleration operation.
must lie below the voltage limiting characteristic curve.
max
must lie below the stability limit.
t
i
Configuration
5.3 Dimensioning
67
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