Communications: electrical – Continuously variable indicating – With particular transmitter
Patent
1986-11-20
1987-12-08
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With particular transmitter
34087004, 340347SY, 34087034, 364559, 364571, 318661, G08C 1906, G08C 1506, G01C 2500
Patent
active
047121068
ABSTRACT:
A phase analog encoding system with compensation for the phase shift error inherent in a resolver position transducer. The inherent phase shift error in a resolver position transducer is compensated independent of a resolver position in a time multiplexed fashion by periodically applying a known reference signal to the resolver and measuring the electrical phase shift across only the resolver. The newly measured value of the inherent electrical phase shift is compared with the last measured value of the inherent electrical phase shift and any deviation is calculated. This deviation is used to determine the appropriate compensation value for the inherent electrical phase shift. The compensation value is subtracted from the resolver phase shift during normal operation resulting in an output signal which is independent of the inherent electrical phase shift error in the resolver position transducer. Additionally, compensation for encoding errors is developed in a calibration mode. This compensation for encoding errors can then be used during the operation of the encoding system.
REFERENCES:
patent: 3537099 (1970-10-01), Johansson
patent: 3612977 (1971-10-01), Perrett
patent: 3648042 (1972-03-01), Perrett
patent: 3803567 (1974-04-01), Pezzlo
patent: 4268786 (1981-05-01), Rohrle
patent: 4472669 (1984-09-01), Denham
patent: 4486845 (1984-12-01), Duckworth
patent: 4594540 (1986-06-01), Currie et al.
patent: 4618940 (1986-10-01), Schmitt
International Cybernetics Corporation
Smith Ralph E.
Weldon Ulysses
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