Apparatus for detecting the pitch of a marine controllable pitch

Details Apparatus for detecting the pitch of a marine controllable pitch Apparatus for detecting the pitch of a marine controllable pitch

1989-04-18

1990-03-06

Basinger, Sherman D.

Marine propulsion

Screw propeller

Variable pitch

416 27, 416157R, 440 86, B63H 300

Patent

active

049062131

ABSTRACT:
The pitch of a marine controllable pitch propeller is detected by a motion/DC current transducer in the propeller hub. Circuitry rotating with the propeller shaft converts an AC power signal to DC for energization of the transducer and converts a DC output signal from the transducer to AC. The AC power and output signals are transferred from the rotating circuit to a stationary circuit in the vessel hull by rotary transformers. There are no contacts between relatively moving parts of the transducer or rotary transformers, thus ensuring long life for the pitch detection system.

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"MCRT.RTM. 16-SG & MCRT.RTM. 26-SG Strain Gage Service Rotary Transformers" Brochure of S. Himmelstein and Company, Hoffman Estates, IL, 1985.
"Linear Displacement Transducer Series BLT", Brochure of Balluff Inc., Florence, Ky.--before May, 1988.
May, E. R., "The Control of Naval Controllable Pitch Propellers;" Sixth Ship Control Systems Symposium, Oct., 1981.
"Controllable Pitch Propeller," Brochure of Bird-Johnson Company, Walpol, Mass.--before May, 1988.

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