Rotational position detector utilizing an FET blocking oscillato

Details Rotational position detector utilizing an FET blocking oscillato Rotational position detector utilizing an FET blocking oscillato

1977-08-26

1979-08-14

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Displacement

331 65, 331112, 123148E, 324 16T, G01B 700

Patent

active

041647068

ABSTRACT:
A rotation detecting apparatus detects the angular position of an engine by rotating from the engine an electrically conductive rotating member having a plurality of equally spaced projections and notches formed on the periphery thereof and arranging a detector to face the rotating member and detect its projections and notches. The detector incorporates a self-running blocking oscillator circuit comprising a transformer and a field-effect transistor. With the engine rotating, the oscillator circuit oscillates when one of the notches on the rotating member is opposite to the detector, whereas when one of the projections on the rotating member is opposite to the detector the oscillator circuit does not oscillate due to the eddy current loss caused in the projection. Another circuit is connected to the oscillator circuit, and this circuit generates a pulse signal whose signal level changes in synchronism with a change in the oscillation condition of the oscillator circuit. This signal level change is indicative of a predetermined angular position of the engine.

REFERENCES:
patent: 2297742 (1942-10-01), Cambell
patent: 2922880 (1960-01-01), Elam
patent: 3424142 (1969-01-01), Nilssen et al.
Garner, Jr.; L. E., Meet Mr. FET.... The Transistor That Thinks Is A Tube, Popular Electronics, Feb. 1967, pp. 47-53, 94.

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