Communications: electrical – Continuously variable indicating – Phase variation
Patent
1982-09-07
1985-12-03
Caldwell, Sr., John W.
Communications: electrical
Continuously variable indicating
Phase variation
324167, 318608, 34087031, G05B 102
Patent
active
045568855
ABSTRACT:
A system for detecting mechanical movement of a body under detection formed of: a synchro generator having a primary and a secondary windings, one of which is capable of being coupled to the body; an exciting circuit for providing exciting current to the primary winding; a reference signal generator for providing a reference signal of a predetermined frequency; a first circuit producing pulses at a frequency which changes depending on the phase difference between the reference signal and the signal induced in the secondary winding; and a frequency-divider counting the pulses and producing a first digital signal indicative of the count value at each moment. The first digital signal is supplied to the exciting circuit which determines the instantaneous value of the exciting current at each moment. The synchro generator, the reference signal generator, the first circuit, the frequency-divider and the exciting circuit form a phase-locked-loop controlling the induced voltage so as to be in a predetermined phase-relationship with the reference signal. There is further provided a device responsive to the phase-locked-loop for producing a second digital signal relating to the movement of the body under detection.
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patent: 4481588 (1984-11-01), Komiya
Caldwell Sr. John W.
Heim Michael F.
Tokyo Shibaura Denki Kabushiki Kaisha
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