Siemens SIMOTICS S-1FK2 Configuration Manual

Free duty cycle
A free duty cycle de󹪝nes the curve of the motor speed and the torque over time.
W
W
L
W7
Q
0
n Speed T Cycle time
M Torque Δt
i
Time interval
t Time
Figure 5-4 Example of free duty cycle
Procedure
Determine the required motor torque as follows:
• De󹪝ne a load torque for each time slice. Also take the average load moment of inertia and
motor moment of inertia into account for acceleration operations. If required, take a
frictional torque into account that opposes the direction of motion.
• With mounted gearbox:
Determine the load torque and the acceleration torque that must be supplied by the motor.
Take the gear ratio and gear e󹪟ciency into account.
Note
A higher gear ratio increases positioning accuracy in terms of encoder resolution. For any
given encoder resolution, as the gear ratio increases, so does the resolution of the machine
position to be detected.
The following formulas can be used for duty cycles outside the 󹪝eld weakening range.
For the motor torque in a time slice Δt
i
the following applies:
WR0L
0
*
WV/DL
L
WV/D
W
s
/DL
L

t
V/DL
5
*
M J J
n
t
i J
n
t
M M
i
=
+ •
2
06
• • +
(
•
2
06
• + +
)
•
1
•
)(
The motor speed is:

= •
n n i
WR0LWV/DL
Con󹪝guration
5.2 Con󹪝guring procedure
1FK2 Synchronous Motors for SINAMICS S120
70 Con󹪝guration Manual, 02/2022, A5E46927724B AD

Siemens SIMOTICS S-1FK2 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FK2
Category	Engine
Language	English