Method and apparatus for determining the angular velocity of a s

Details Method and apparatus for determining the angular velocity of a s Method and apparatus for determining the angular velocity of a s

1990-06-06

1992-06-09

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

324173, 32420711, 32420714, 32420725, G01P 342, G01P 348, G01P 354, G01B 714

Patent

active

051210541

ABSTRACT:
A tachometer particularly adapted for operation as a rotational velocity feedback transducer is provided. First and second proximity detectors are used to monitor orthogonal positions of an irregular surface portion of a rotating shaft and provide x and y signals that are substantially in quadrature. The x and y signals are differentiated with respect to time to provide differential signals that are representative of dx/dt and dy/dt, respectively. Signals representative of products x dy/dt and y dx/dt are generated from the x signal and the differential signal dy/dt, and the y signal and the differential signal dx/dt, respectively. A signal representative of algebraic sum x dy/dt--y dx/dt is generated from the signals representative of products x dy/dt and y dx/dt. A signal representative of quotient of (x dy/dt-y dx/dt) divided by the displacement r.sup.2 of the irregular surface portion is generated from the signal representative of algebraic sum (x dy/dt-y dx/dt) which signal is representative of the rotational velocity of the rotating shaft.

REFERENCES:
patent: 4181884 (1980-01-01), Shirasaki et al.
patent: 4752732 (1988-06-01), Van Scholack et al.
patent: 5059900 (1991-10-01), Phillips

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