Phase detector control for a servo system

Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems

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318317, 318327, 318603, G05B 1101

Patent

active

045958688

ABSTRACT:
A phase detection control apparatus is disclosed for detecting any variable where the phase is discretely measured, as for example, in a motor having a tachometer of an optical type. The phase detection apparatus eliminates direction sensitivity and does not suffer from the misposition of any upper and lower limits. The apparatus achieves a phase lock without excessive overshoot and eliminates the possibility of reverse run away under any condition. Moreover, the circuitry is easily implemented with a relatively few number of circuit components and therefore accomplishes the desirable functional capabilities at relatively low cost.

REFERENCES:
patent: 3582541 (1971-06-01), Hebb
patent: 4155033 (1979-05-01), DeBell et al.
patent: 4201936 (1980-05-01), Roumanis
patent: 4242619 (1980-12-01), Nakamura et al.
patent: 4272818 (1981-06-01), McDaniel
patent: 4371819 (1983-02-01), Kaufmann
patent: 4381479 (1983-04-01), Wesling et al.
patent: 4412161 (1983-10-01), Cornaby
patent: 4413212 (1983-11-01), Okamoto et al.
IEEE Transactions on Magnetics, vol. Mag-17, No. 4, Jul. 1981, pp. 1435-1437.

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