Notch Filters - Omron OMNUC G5 Series User Manual

11-7 Notch Filters

11-7 Notch Filters

When the machine rigidity is low, axis torsion may produce resonance which results in vibration
and noise. Thus you may not be able to set a high gain. The notch filter can restrict the
resonance peak, and allows a high gain setting and vibration reduction.
The OMNUG G5-series Servo Drives provide four notch filters that can be used for adjusting
frequency, width and depth. If a ball screw or other controlled device causes resonance at a
specific location, you can set the resonance frequency using a notch filter to eliminate
resonance.
11
A notch filter is used to eliminate a specified frequency component.
0db
-3db
If machine resonance occurs, use this notch filter to eliminate resonance.
11-21
Width fw
Cut-off frequency Fc
Machine resonance
Notch filter
Notch filter 1
OMNUC G5-series AC Servomotors and Servo Drives User's Manual (with Built-in EtherCAT Communications)
fw
Depth=Fc/fw
Frequency Hz
Characteristics
after filtering
Notch filter 2