US 4,360,889 AGranted

Rotary position indicating circuit

AssigneeF. Jos. Lamb Company

InventorRudolph J. Liedtke

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Abstract

A circuit for indicating angular position of a rotary member comprising a resolver including an amplitude stabilized sine-cosine generator coupled to quadrature windings of the resolver for providing a d.c. signal which varies as a linear function of the position of a rotatable member coupled to the resolver. The d.c. signal is fed to a plurality of comparators for comparing such angular position to a plurality of predetermined angular set points. The comparators are coupled to a priority encoder for indicating angular position of the rotary member. The encoder includes a switch array and a plurality of exclusive-OR gates for programming the encoder to provide a zero output at an arbitrary position of the rotary member. A digital voltmeter calibrated in angles of member rotation is coupled through a plurality of momentary contact push-button switches for normally receiving the d.c. signal indicative of angular rotation, and for alternatively and selectively receiving a signal indicative of a selected one of the set points for facilitating set point adjustment.

Claims6

Dependent claims

Apparatus for indicating angular position of a rotary member over a selected angular range comprising

means adapted to be coupled to a said rotary member for providing a d.c. first output signal at a level which varies as a function of angular position of said rotary member over said angular range,
a plurality of threshold means responsive to said first output signal for indicating passage of said first output signal through a plurality of thresholds corresponding to preselected angular positions of said angular member within said range, each of said plurality of threshold means providing a d.c. second output signal indicative of passage of said first output signal through a corresponding said threshold,
priority means for assigning a selected order of priority among said second output signals corresponding to a selected order of preselected angular positions within said range from a nominal zero position, and
means operatively coupled to said threshold means and to said priority means and responsive to said second output signals for indicating a one of said output signals of highest priority corresponding to a one of said preselected angular positions farthest from said nominal zero reached by said rotary member.

1 more element

Dependencies are inferred from the claim text.