Rotating shaft alignment monitor

Details Rotating shaft alignment monitor Rotating shaft alignment monitor

1975-12-19

1979-04-03

Caldwell, Sr., John W.

Communications: electrical

Digital comparator systems

33181R, 340177R, 340177VA, 340199, G08C 2500, G08C 1904, G08C 1908

Patent

active

041480139

ABSTRACT:
A system for monitoring misalignment between two in-line rotating shafts and for indicating the direction of shaft misalignment wherein alignment sensors are mounted directly to and rotate with the shafts. The sensors are mounted to detect position or stress variations between elements on coupled shafts as a function of the rotational position of the shaft and thus errors normally encountered where the sensor is positioned off the shaft are avoided. A coupling system such as a rotary transformer is employed to apply power to the sensors and associated circuitry on the shaft and to receive from the shaft signals indicative of sensed misalignment. A signal representative of relative phasing between the rotating shaft and surrounding equipment is provided and is used in electronically processing the misalignment signals to provide output signals indicative of the direction and orientation of misalignment between the rotating shafts on orthogonal axes. Complete data is thus provided on the necessary movement of either or both shafts in order to bring them back into alignment.

REFERENCES:
patent: 3711955 (1973-01-01), Holt
patent: 3783522 (1974-01-01), Dodd
patent: 4033042 (1977-07-01), Bently

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