Coded data generation or conversion – Phase or time of phase change – Synchro or resolver signal
Patent
1987-08-25
1989-08-15
Shoop, Jr., William M.
Coded data generation or conversion
Phase or time of phase change
Synchro or resolver signal
341112, 341114, 318656, 318661, H03M 164
Patent
active
048579262
ABSTRACT:
An apparatus for generating phase modulated angular positional signals in digital form. A phase tracking loop receives a phase modulated signal from the rotor of a resolver whose stator windings are excited in quadrature. The phase output of the resolver is proportional to the angular displacement of the rotor. Signals for exciting the stator windings of the resolver are applied in phase quadrature to a phase detector to develop an analog error signal when combined with the rotor output signal. The analog phase error signal provides an output indicative of the angular displacement of the rotor. The error signal is applied to a voltage controlled oscillator, converted to digital form, and combined with the excitation signals in a closed loop to force the error signal to a null, whereupon the indicated digital output angle is in coincidence with the angular displacement of the rotor shaft.
REFERENCES:
patent: 3634838 (1972-01-01), Granqvist
patent: 3914760 (1975-10-01), Logue
patent: 4119958 (1978-10-01), Simon et al.
patent: 4449117 (1984-05-01), Fortescue
The Engineering Staff of Analog Devices, Inc., Synchro and Resolver Conversion, 1980, pp. 43-51. Identified as the "Boyes Textbook".
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-61 to I-64.
"Inductosyn Precision Linear & Rotary Position Transducers", Farrand controls, Valhalla, NY (undated) (8pp).
Gasking, J. "Resolver-to-Digital Conversion Alternative to Optical Shaft Encoders", Motion, Jan./Feb. 1986, (20-23).
Resolver-to-Digital/Tachometer Converter, Series TACH-12, Control Sciences Inc., Chatsworth, CA, Aug. 1985, (6pp).
Cunningham David C.
Neglia Joseph D.
Albin Arnold L.
Honeywell Inc.
Shoop Jr. William M.
Young Brian K.
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