Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1976-03-25
1977-09-06
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318657, 318606, 235155, G05B 101
Patent
active
040470865
ABSTRACT:
A phase-sensitive transducer apparatus comprises first and second relatively movable members wherein the first relatively movable member has a plurality of windings and the second relatively movable member has a winding. Means are included for applying a first input signal to one of the windings of the first relatively movable member and a second input signal to another of the windings of the first relative movable member. An output signal is induced on the winding of the second relatively movable member. The first and second input signals are sinusoidal in nature of substantially identical frequency and peak amplitude and are phase-displaced by a predetermined amount, and the output signal is substantially constant in peak amplitude and variable in phase during relative movement of the first and second relatively movable members. The means for applying comprises clock means for generating a clock signal at a clock frequency, means coupled to the clock means and responsive to the clock signal for generating a plurality of mutually phase-displaced square-wave signals of substantially identical frequency and peak amplitude, means coupled to the means for generating and responsive to a first group of the plurality of square-wave signals for deriving the first input signal and responsive to a second group of the plurality of square-wave signals different from the first group for deriving the second input signal, and means for coupling the first and second input signals to the respective windings of the first relatively movable member.
REFERENCES:
patent: 3191010 (1965-06-01), Tripp et al.
patent: 3395322 (1968-07-01), Peterssen et al.
patent: 3872369 (1975-03-01), Rich
patent: 3876888 (1975-04-01), Gyugyi et al.
Anderson T. J.
Colitz, Jr. M. J.
Dobeck B.
Smith B. P.
Xerox Corporation
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