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Control

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Synonyms

Control system; Drive control; Sliding mode control

Definition

This essay presents feed drive control systems used in modern CNC machine tools. Considering the rigid body motion of the feed drive, widely used control algorithms such as P-PI and PID control are being introduced. At last, the sliding mode control algorithm is presented, and its performance against the conventional PID control is shown.

Theory

In general context, a control system is a device to manage, command, or regulate the behavior of another device or a system. In CNC machine tool systems, the objective of the control system is to regulate the actual position of the feed drive to follow the reference motion trajectory programmed by the user. Hence, the control law on a machine tool tries to minimize deviation of the drive position xm(t) from the commanded position xr(t).

$$ e(t)={x}_r(t)-{x}_m(t) $$
(1)

Dynamic Model of Feed Drive

Considering a widely used ball screw feed drive design, the system consists of...

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References

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Correspondence to Burak Sencer .

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Sencer, B. (2019). Control. In: Chatti, S., Laperrière, L., Reinhart, G., Tolio, T. (eds) CIRP Encyclopedia of Production Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53120-4_6525

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