Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1989-03-09
1990-10-16
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With stabilizing features
318662, 360 7713, 360 7705, G05B 602
Patent
active
049638068
ABSTRACT:
A notch filter, used in a servo loop, for dampening a mechanical resonance of a mechanism to be servo-controlled, including a serial T-type filter with a capacitor-resistor (CR) network having a serial connection of a first, second and third capacitors connected between an input terminal of the serial T-type filter and an output terminal of the Cr network; a first resistor connected between a return terminal of the CR network and an interconnection of the first and second capacitors; a second resistor connected between the return terminal and an interconnection of the second and third capacitors; and a third resistor connected in parallel to the three serial capacitors. A notch frequency of the notch filter is adjusted by varying the resistance values of the first and second resistors. The first and second resistors may include fixed and/or potentiometer-type variable resistors. An output from the CR network may be divided to be fed back to the return terminal to provide feedback. Amplifiers may be added to the output of the CR network and the feedback circuit to provide isolation. The first and second resistors for adjusting the notch frequency may be separately installed in a detachable disk unit which includes the mechanism to be servo-controlled. As a result, the notch frequency can be efficiently adjusted by replacing only two fixed resistors or by adjusting the variable resistor, and the cost of the disk unit can be reduced.
REFERENCES:
patent: 2996689 (1961-08-01), Janz
patent: 4300226 (1981-11-01), Barnette
patent: 4540946 (1985-09-01), Sainz
patent: 4638384 (1987-01-01), Stewart
patent: 4656529 (1987-04-01), Sakamoto
Samuels, IEEE Transactions on Magnetics, "Beyond the Second Order System in Track Following Servos", vol. 14, No. 4, Jul. 1978, N.Y., pp. 178-179, Figures 1-3.
D. R. Wilson, Electronics Letters, "Adaptive Compensation of Mechanical Resonances", vol. 3, No. 12, Dec. 1967, Engage GB.
Sato Takatoshi
Shinohara Toru
Bergmann Saul M.
Fujitsu Limited
Shoop Jr. William M.
LandOfFree
Servo positioning apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Servo positioning apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Servo positioning apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-851700