Siemens SIMOTICS S-1FK2 Series - Page 58

Configuration
5.2 Configuring procedure
1FK2 synchronous motors for SINAMICS S120
56 Configuration Manual, 06/2019, A5E46927724B AB
The following formulas can be used for duty cycles outside the field weakening range.
For the motor torque in a time slice Δ t
i
the following applies:
The motor speed is:
The effective
torque is obtained as follows:
The average motor speed is calculated as follows:
J
M
Motor moment of inertia
J
G
Gearbox moment of inertia
J
load
Load moment of inertia
n
load
Load speed
i
Gear ratio
η
G
Gearbox efficiency
M
load
Load torque
M
R
Frictional torque
T
Cycle time
A; E
Initial value, final value in time slice Δ
t
i
t
e
ON duration
∆
t
i
Time interval