Digital servo control unit and laser machining apparatus
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United States of America Patent
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Feb 24, 2009
Grant Date -
Nov 30, 2006
app pub date -
May 30, 2006
filing date -
May 31, 2005
priority date (Note) -
Expired
status (Latency Note)
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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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