Electricity: electrical systems and devices – Electrical speed signal processing systems – Including frequency generators
Patent
1984-06-04
1987-10-27
Hix, L. T.
Electricity: electrical systems and devices
Electrical speed signal processing systems
Including frequency generators
G01P 352
Patent
active
047033916
ABSTRACT:
A method and relative circuit in which, signals (sin .phi.M, cos .phi.M) detected by an inductive transducer, supplied by a suitable oscillator, are caused to pass through a RC circuit, to obtain an output signal (VA) out of phase by an angle (.phi.M) proportional to the angle between the polar axis of the rotor and the polar axis of the stator of the transducer, in the case of a rotary detector. Two sets of signals are separately processed: the first set comprises the output signal of the oscillator (fr) and the output signal from the circuit RC (VA); the second set comprises the output signal from the circuit RC (VA) and a signal having the same frequency as the output signal from the oscillator, but out of phase by a fixed angle (F2). Each of these sets, are made to pass through a circuit for detecting the equivalence or not equivalence of the polarity of the input signals, then filtered, derived, in case inverted and then selected by a selecting means to output a tachymetric signal of infinite resolution.
REFERENCES:
patent: 3501651 (1970-03-01), Cottrell
patent: 3603869 (1971-09-01), Neuffer et al.
patent: 3761811 (1973-09-01), Aberle et al.
patent: 4379221 (1983-04-01), Avins et al.
patent: 4481468 (1984-11-01), Ono et al.
el.ge Apparecchiature Elettroniche Industriali S.r.l.
Gray David M.
Hix L. T,.
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