Specifications
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is the most common use for rotary encoders. In
this type of application, an encoder is either mounted directly to the
motor, or indirectly using a measuring wheel or chain-and-sprocket
arrangement. The parameter of interest is primarily the speed of the
motor.
is an application in which the encoder is not usually
mounted to the drive motor, but to one of the tensioning arm rollers.
Any unevenness in the speed of this roller indicates that proper web
tension is not being maintained and must be adjusted. The rotating
speed of the tensioning roller is fed back to the controller, which
then adjusts the drive motor so that web material is kept at an even
tension.
is a very practical application of an encoder combined
with simple mathematics. If, for example, a system were to be
designed with a roller that is exactly one foot in circumference, the
roller would feed one foot of material for every revolution of the
roller. An encoder mounted to the roller would reflect this situation
and could tell a controller how much material had been fed through
the roller. The resolution of the encoder would also directly reflect
the accuracy of the cut. In the above example, 96 CPR would yield
cuts to an 1/8" accuracy.
are just one example where encoders can perform a
dual role. They can determine the position of the elevator through
a mathematical calculation similar to the above, and they can
determine the speed of travel of the elevator.
uses encoders to determine the position
of a unit relative to a known point, and then to determine the
unit's speed relative to that mark. Radar antenna rotation is a good
example of this type of application.
In the encoder is used to make sure that the
unit, typically a machine tool, does not exceed a preset position or
direction of travel. Very often, this is combined with a determination
of the speed of travel of the table, tool head, or similar component.
Filling applications is just one example where Table Positioning is
critical since the item being filled must arrive at filling tube at the
same time the fluid control is turned on.
is another common industry where encoders are widely
used. They may be attached to the motor, to intermediate axle shafts,
or to both. Encoders are an especially effective feedback device
where the positioning and/or speed of multi-element conveying
systems must be carefully coordinated.
(sometimes referred to as ) is another
application where encoders can prove invaluable. Not only is it
necessary that the speed of the supply and take-up reels be kept
in proper relation to each other, but the amount of material being
spooled must also often be tracked.
is just one industry that widely uses encoders in Pick and
Place applications. Here many of the capabilities of encoders (rate,
position, speed, velocity) can often be found combined in a single
system.
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