Propeller speed and phase sensor

Details Propeller speed and phase sensor Propeller speed and phase sensor

G - Physics

01

P

354/18, 354/32

G01P 3/48 (2006.01) B64C 11/48 (2006.01) B64C 11/50 (2006.01) B64D 45/00 (2006.01) G01P 3/489 (2006.01) G01P 3/56 (2006.01)

Patent

CA 1258914

PROPELLER SPEED AND PHASE SENSOR ABSTRACT OF THE DISCLOSURE A speed and phase sensor for counterrotating aircraft propellers is described. A toothed wheel is attached to each propeller, and the teeth trigger a sensor as they pass, producing a sequence of signals. From the sequence of signals, the rotational speed of each propeller is computed, based on the time intervals between successive signals. The speed can be computed several times during one revolution, thus giving speed information which is highly up-to-date. Given that the spacing between teeth may not be uniform, the signals produced may be nonuniform in time. Error coefficients are derived to correct for nonuniformities in the resulting signals, thus allowing accurate speed to be computed despite the spacing nonuniformities. Phase can be viewed as the relative rotational position of one propeller with respect to the other, but measured at a fixed time. The invention computes phase from the signals.

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