Air core gauge with expanded pointer range

Details Air core gauge with expanded pointer range Air core gauge with expanded pointer range

1974-04-29

1976-03-23

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324140R, G01P 348, G01R 700

Patent

active

039463117

ABSTRACT:
An air core gauge is provided with a plurality of angularly oriented coils. Switching means are connected to the coils in order to control the flow of current therethrough. Pulse generators responsive to variations in frequency of electrical signals representative of a condition, such as vehicle speed or engine RPM, control the switching means so as to cause excitation of the coils to produce a resultant mmf vector, the angular position of which is related to the frequency of the signals. The resultant mmf vector causes a magnet and associated pointer to rotate to thereby provide an indication of the value of the condition.

REFERENCES:
patent: 3602811 (1971-08-01), Fales
patent: 3636447 (1972-01-01), Gelenius
patent: 3694750 (1972-09-01), Schuhrke

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