Capacitive angular displacement transducer for remote meter read

Details Capacitive angular displacement transducer for remote meter read Capacitive angular displacement transducer for remote meter read

1979-02-09

1980-12-09

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With particular transmitter

324 61R, 340347P, G08C 902, G08C 1910

Patent

active

042387817

ABSTRACT:
A capacitive angular displacement transducer having a rotor plate and a first and second stator plates is disclosed. The rotor plate is coaxially mounted between, and parallel to, the first and second stator plates. The first stator plate is divided into four excitation areas each being impressed with a sinusoidal excitation voltage having a different phase angle. The rotor plate has a first face having two conductive patterns. The two conductive patterns act as resolvers to produce resultant voltages from the vector addition of the voltages variably capacitively coupled thereon due to the excitation voltages. The rotor plate has a second face having two annular conductive areas electrically connected to the conductive patterns of the first rotor face. The second rotor face together with the second stator plate form a constant capacitive pickup for the resultant voltages produced by the two conductive patterns of the first rotor face.

REFERENCES:
patent: 2674729 (1954-04-01), Carter
patent: 3198937 (1965-08-01), Wooster
patent: 3222668 (1965-12-01), Lippel
patent: 3238523 (1966-03-01), Masel et al.
patent: 3296522 (1967-01-01), Wolfendale
patent: 3421371 (1969-01-01), Williams
patent: 3702467 (1972-11-01), Melnyk
patent: 3717869 (1973-02-01), Batz
patent: 3732553 (1973-05-01), Hardway
patent: 3766544 (1973-10-01), Batz
patent: 3845377 (1974-10-01), Shimetori
patent: 3873916 (1975-03-01), Sterki
patent: 4007454 (1977-02-01), Cain et al.
"Special Variable Condensers", Components Handbook, Blackburn (editor), pp. 288-299.

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