Siemens SIMOTICS S-1FT7 User Manual

Configuration
5.2 Procedure when engineering
S-1FT7 synchronous motors
114 Configuration Manual, 09/2018, A5E45099423B AA
Free duty cycle
A free duty cycle defines the curve of the motor speed and the torque over time.
n
Speed
T
Cycle time
M
Torque
Δt
i
Time interval
t
Time
Figure 5-5 Example of free duty cycle
Procedure
Determine the required motor torque as follows:
● Define 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 efficiency into account.
Note
A higher gear ratio increases positioning accuracy in terms of encoder resolution. For any
given motor encoder resolution, as the gear ratio increases, so does the resolution of the
mach
ine position to be detected.

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English