Definitions of motion control vary widely in industry today.
Depending on the application, motion control can refer to simple on-off
control or a sequencing of events, controlling the speed of a motor,
moving objects from one point to another, or precisely constraining the
speed, acceleration, and position of a system throughout a move.
Engineers
working for the first time in some aspect of motion control may be
confused by varying interpretations used in the field. Motion control
means different things to different sections of industry. As an
introduction, this chapter differentiates among motion-control
techniques. It puts each technique into perspective in terms of where
typical applications arise.
In many cases, motion-control
techniques are intimately tied to the controller as well as to the
positioning hardware and actuator. No overview of motion control would
be complete without a discussion of the various control options that are
widely used. These include simple timers and counters, chip-level and
board-level computers, programmable logic controllers, and pneumatic
sequencers.
Industrial motion control can be divided into
four categories: sequencing, speed control, point-to-point control, and
incremental motion.
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