Digital servo control unit and laser machining apparatus

Details Digital servo control unit and laser machining apparatus Digital servo control unit and laser machining apparatus

2006-05-30

2009-02-24

Bahta, Kidest (Department: 2123)

Data processing: generic control systems or specific application

Generic control system, apparatus or process

Digital positioning

C700S166000

Reexamination Certificate

active

07496415

ABSTRACT:
A digital servo control unit which uses a D/A converter, which suppresses the spike-like pulsation superimposed on a current error signal inside a current control circuit, and which has control performance not lower than that in the background art even when a low-voltage and low-price power supply circuit is used. A first-order low pass filter acts on an analog signal output by the D/A converter, and a stabilizing compensation occurs for a phase delay caused by the first-order low pass filter. The first-order low pass filter is formed as a low pass filter having a cut-off frequency which is lower than a sampling frequency. The first-order low pass filter may be replaced by a notch filter having a cut-off frequency which is equal to a sampling frequency or which is equal to an integer multiple of a Nyquist frequency.

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