Variable response notch filter for machine resonance...

Details Variable response notch filter for machine resonance... Variable response notch filter for machine resonance...

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G05D 3/00 (2006.01) G05B 5/01 (2006.01) G05D 3/14 (2006.01) H03H 7/065 (2006.01)

Patent

CA 1101101

A VARIABLE RESPONSE NOTCH FILTER FOR MACHINE RESONANCE ELIMINATION IN A SERVO CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE This invention relates to a flexible notch filter for use in a servo system to eliminate natural mechanical resonance. The filter is an improved "twin-T" type where the "in-phase" output of the filter is fed back into the filter. Varying the feedback varies the bandwidth of the filter. The improved filter further provides for attenuation control in addition to control of the centre frequency of the filter. The advantage of this filter over prior art designs is that one filter may be manufactured and adapted to be used in many servo systems since the filter can be easily adjusted to effectively eliminate the natural resonating frequency of the machine in addition to reducing phase leg at frequencies below the centre frequency of the notch filter.

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