Electricity: motive power systems – Positional servo systems – With stabilizing features
Patent
1986-08-18
1989-06-13
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With stabilizing features
318611, 318619, G05B 501
Patent
active
048395730
ABSTRACT:
Method and apparatus for providing selfadaptive feedback control loop bandwidth and phase margin regulation automatically, to rapidly and predictably closely compensate for externally-caused bandwidth and phase margin changes, such as caused by changing load inertia presented to an actuator. Regulation is effected by controlling a loop-bandwidth correcting compensation element whose change is rendered equal to that of the loop affecting external change, but opposite in phase and change in magnitude. In a preferred embodiment, a correcting apparatus is within an internal feedback control loop which, by automatically compensating against a stated allowable range of uncorrected bandwidth variation, provides uniform static and dynamic bandwidth regulation for both internal feedback control loop and, therefore, regulation of the feedback control loop bandwidth and phase margin. Change-sensing for operation of the internal feedback control loop is accomplished by synchronous detection means employing a very low-level carrier signal whose frequency is set close to the preset bandwidth of the feedback control loop of interest.
REFERENCES:
patent: 4143311 (1979-03-01), Lee
patent: 4300081 (1981-11-01), Van Laudingham
patent: 4434458 (1984-02-01), Kazahaya
patent: 4446409 (1984-05-01), Rawicz et al.
patent: 4449082 (1984-05-01), Webster
patent: 4498036 (1985-02-01), Salemka
patent: 4498037 (1985-02-01), Razavi
Richard L. Melton Real-Time Adaptive Velocity Control May 1986, vol. 12, No. 5, pp. 40-44.
Allen Kenneth R.
Ro Bentsu
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