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1-4
Section
#
Control System Principles
Open-Loop System
In an open-loop system, the Position Control Unit outputs pulse trains as speci-
fied by the PC program to control the angle of rotation of the motor. Because the
Unit outputs pulse trains, it is generally used with a stepping motor. The angle of
rotation of a stepping motor can be controlled through the number of pulse sig-
nals supplied to the motor driver. The number of rotations of the stepping motor
is proportional to the number of pulses supplied by the Unit, and the rotational
speed of the stepping motor is proportional to the frequency of the pulse train.
Positioning pulse
1 2
n
Positioning output
Angle of
rotation
Angle of rotation
The following diagram and parameters illustrate a simplified positioning system.
M : Reduction ratio
P : Feed screw pitch (mm/revolution)
V : Feed velocity of object being positioned (mm/s)
θ
s
: Stepping angle per pulse (degree/pulse)
P
Stepping motor
Reduction gear
Object being
positioned
N
M
V
Feed screw pitch
The positioning accuracy in mm/pulse is computed as follows:
Positioning accuracy
= P/(pulses per revolution x M)
= P/((360/
θ
s
) x M))
= (P x
θ
s
)/(360 x M)
The required pulse frequency from the Unit (pulses/second) is computed as fol-
lows:
Pulse frequency
= V/Positioning accuracy
= (360 x M x V)/(P x
θ
s
)
And the required number of pulses to feed an object by a distance L in mm is
computed as follows:
Number of pulses
= L/Positioning accuracy
= (360 x M x L)/(P x
θ
s
)
Basic Positioning
System Design
Summary of Contents for SYSMAC C500-NC113
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