Configuration
5.2 Configuring workflow
1FN3 linear motors
114 Configuration Manual, 10/2018, 6SN1197-0AB86-0BP2
Calculation of the effective force of the duty cycle
In addition to the peak force, the required effective force of the duty cycle of the motor is
decisive for its dimensioning. The
maximum
effective force of the duty cycle of the motor F
eff
is calculated from the square mean of the motor force over the entire time Δt
ges
of a
sequence of motion and must not exceed the rated force F
N
:
When the motor force is constant over sections, this simplifies the integral for the sum, as
shown in the following figure:
Figure 5-8 Effective force of the duty cycle with motor force constant over sections
The equations stated above apply to calculation of the effective forces. For more precise
calculations, the forces must be replaced by the corresponding currents and the rms current
determined. Here the effects of the motor saturation must be taken into account.
Selection of the primary sections
Requirements relating to the primary section
Whether a primary section can fulfill the requirements from the duty cycle, depends on the
following items:
● Rated force F
N
of the primary section must be greater than or equal to the calculated
value of the effective force of the duty cycle F
eff
.
● The primary section should have approximately 10% control reserve over the required
peak load force F
L,MAX
, in order to avoid undesired limitation effects when control circuits
oscillate.
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