Siemens SIMODRIVE 611 Configuration Manual page 41

The average motor speed is calculated as follows:
n
J
M
J
G
J
load
N
load
i
η
G
M
load
M
R
T
I;F
t
e
The rms torque M
The maximum torque M
motors must lie below the voltage limiting curve and for induction motors below the stability
limit.
In summary, the motor is selected as follows:
Figure 3-7
General Section for Synchronous Motors
Configuration Manual, (PJAL), 11.2005 Edition, 6SN1 197-0AD07-0BP4
+
n n
•
t
2
=
t
Motor moment of inertia
Gearbox moment of inertia
Load moment of inertia
Load speed
Gear ratio
Gearbox efficiency
Load torque
Friction torque
Cycle time, clock cycle time
Initial value, final value in time slice Δ
Power-on duration
must lie below the S1 curve.
rms
is required when the drive is accelerating and for synchronous
max
Selecting motors depending on the load duty cycle (example)
t
k
Configuration
3.3 Dimensioning
3-11