Configuration
5.2 Configuring workflow
1FW3 complete torque motors
100 Configuration Manual, 08/2020, A5E46027705B AA
Note
A holding torque may be required when the motor is stationary. This holding torque must be
taken into consideration for M
rms
. The reason could be that self-locking gearboxes are not
Duty cycle, variable
A load duty cycle defines the characteristics of the motor speed and the torque with respect
to time.
Figure 5-6 Example of a load duty cycle
A load torque is specified for each time period. In addition to the load torque, the medium
load moment of inertia and motor moment of inertia must be taken into account for
acceleration. It may be necessary to take into account a frictional torque that opposes the
direction of motion.
The gear ratio and gear efficiency must be taken into account when calculating the load
and/or accelerating torque to be provided by the motor.
Note
For duty cycles in the field weakening range, the SIZER for SIEMENS Drives engineering
tool must be used. 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:
Calculation of the motor speed
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