Frequency detector

Details Frequency detector Frequency detector

1981-12-08

1983-10-18

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324174, G01P 348, G01P 354

Patent

active

044108532

ABSTRACT:
A frequency detector comprising first, second and third conductive patterns. The first conductive pattern includes an even number of first straight conductive pieces which are disposed radially at regular intervals and sequentially connected in series alternately through first inner periphery conductive pieces and first outer periphery conductive pieces. The second conductive pattern includes an even number of second straight conductive pieces disposed radially at predetermined intervals between the adjacent two first straight conductive pieces at the outer periphery sides of the respective first inner periphery conductive pieces and connected in series. The third conductive pattern includes an even number of third straight conductive pieces disposed radially at predetermined intervals between the adjacent two first straight conductive pattern at the inner periphery sides of the respective first outer periphery conductive piece and connected in series. A first and a second terminal are provided at both ends of the first conductive pattern. The first, second and third conductive patterns are connected in series between the first terminal and a third terminal provided at an end of the second or third conductive pattern.

REFERENCES:
patent: 3377556 (1968-04-01), Corcoran

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