Siemens SIMOTICS 1FT2104-4AF - Page 66

Configuration
5.2 Configuring procedure
1FT2 synchronous motors for SINAMICS S120
64 Configuration Manual, 03/2021, A5E50645584B AA
The motor speed is:
The effective torque is obtained as follows:
The average motor speed is calculated as follows:
JM
Motor moment of inertia
JG
Gearbox moment of inertia
Jload
Load moment of inertia
nload
Load speed
i
Gear ratio
ηG
Gearbox efficiency
Mload
Load torque
MR
Frictional torque
T
Cycle time
A; E
Initial value, final value in time slice Δt i
te
ON duration
∆ti
Time interval
The effective torque Meff must lie below the S1 characteristic.
The maximum torque M
max is produced during the acceleration operation. Mmax must lie
below the voltage limiting characteristic curve. In summary, the motor is configured as
follows:
M_max
Curve of the maximum torque
S1
S1 characteristic = M0
M_eff
Effective torque
●
Points from the traversing profile
n_mean
Mean speed
Figure 5-5 Motor selection for duty cycle
You have defined the characteristic motor values corresponding to the duty cycle.
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