Slide way positional control systems may be classified into three different groups, these are: an open-loop system and closed-loop system, with indirect measurement a closed-loop system using direct measurement. Considering each system in turn and illustrating their mode of operation and control using simple block diagrams will be the theme discussed next.

Open-looped systems by definition do not use any form of feedback control and as such neither the slide movement nor its velocity is monitored. With such a system, moved a certain distance. As no form of slideway monitoring system is present, this method of control is relatively cheap to construct; however its real draw-back is that any errors that are present will obviously accumulate.

As mentioned above, these open-loop systems for slideway motion and control rely on method of operation will be mentioned later in stepping motors and their this chapter. Any closed-loop system has two extra elements that are not systems. These are the present on open-loop attached the head measuring system to the ballscrew assembly, and its comparator. The measuring head is will begin to monitor so that as it is rotated by the energised drive servo value required by the the a gular displacement then compare it with the signalling occurs continuously.

If the slide movements are compared with an open loop system, then the whole action seems to be much more "controlled" giving a feeling of a higher degree of precision to the system. One problem associated with this indirect feedback control system, is that it is prone to suffer from "torque effects".

So, what's your view about Slideway Positional Control Systems?

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