Variable response notch filter for machine resonance elimination

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

1978-06-08

1980-03-25

Heyman, John S.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330109, 333171, H03B 104

Patent

active

041952650

ABSTRACT:
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 center 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 lag at frequencies below the center frequency of the notch filter.

REFERENCES:
patent: 3355668 (1967-11-01), Boensel et al.
patent: 3369189 (1968-02-01), Hoffman et al.
patent: 3577179 (1971-05-01), West
patent: 3628057 (1971-12-01), Mueller
patent: 3673503 (1972-06-01), Parker
patent: 4120370 (1978-10-01), Bosson et al.

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