Patent US4270077A successfully refreshed from Google Patents.
US4270077A
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Demodulatorless synchro position sensor apparatus utilizing square wave excitation
Assignee: Honeywell Inc
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Filing: 1980-03-10
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Granted: 1981-05-26
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Expires: 2000-03-10
Abstract
Abstract A synchro resolver angular position sensor provides the sine and cosine of angular position by applying a square wave excitation to the resolver stator winding. The corresponding square wave outputs of the sine and cosine windings of the resolver rotor are sampled in time synchronism with the excitation at a predetermined time phase of the square wave excitation cycle. The sampled sine and cosine amplitudes are converted into digital format via an analog-to-digital converter for application to a digital processor. The upper corners of the positively-going leading edges and the lower corners of the negatively-going leading edges of the square wave excitation waveform are rounded to minimize ringing of the sine and cosine square wave outputs from the resolver.
Inventors
- 👤 Harold L. Swartz
- 👤 Joseph M. Buemi, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:47
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/38; G08C19/46; G05; G05D; G05D3/00; G05D3/12; G05D3/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
Apparatus for use with a synchro device having excitation input winding means and output winding means for providing a demodulated synchro output signal, comprising excitation means for providing a square wave excitation signal to said excitation input winding means, said square wave excitation signal being coupled from said excitation input winding means to said output winding means for providing a square wave output signal thereat, and sampling means for sampling said square wave output signal at a predetermined time phase of said square wave excitation signal thereby providing a sampled square wave output signal, said sampled square wave output signal providing said demodulated synchro output signal.
Claim 2
Dependent Claim
106 words
Apparatus for use with a synchro device having excitation input winding means and output winding means for providing a demodulated synchro output signal, comprising excitation means for providing a square wave excitation signal to said excitation input winding means, said square wave excitation signal being coupled from said excitation input winding means to said output winding means for providing a square wave output signal thereat, and sampling means for sampling said square wave output signal at a predetermined time phase of said square wave excitation signal thereby providing a sampled square wave output signal, said sampled square wave output signal providing said demodulated synchro output signal.
Claim 3
Dependent Claim
50 words
The apparatus of claim 1 in which said synchro device comprises a synchro resolver having rotor winding means and stator winding means, said input winding means being one of said rotor and stator winding means and said output winding means being the other of said rotor and stator winding means.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2 in which said synchro resolver is utilized to sense angular displacement of a member, said rotor winding means being coupled to said member.
Claim 5
Dependent Claim
27 words
The apparatus of claim 2 in which said rotor winding means and said stator winding means comprise said output winding means and said input winding means respectively.
Claim 6
Dependent Claim
31 words
The apparatus of claim 1 further including analog-to-digital conversion means responsive to said sampled square wave output signal for converting said sampled square wave output signal into an equivalent digital word.
Claim 7
Dependent Claim
38 words
The apparatus of claim 1 in which said excitation means includes a synchro excitation circuit for rounding the corners of the leading edges of said square wave excitation signal to minimize ringing on said square wave output signal.
Claim 8
Dependent Claim
38 words
The apparatus of claim 6 in which said synchro excitation circuit includes level shifting means for shifting the d.c. level of said square wave excitation signal to provide said square wave excitation signal with a zero d.c. component.
Claim 9
Dependent Claim
16 words
The apparatus of claim 1 in which said sampling means comprises a sample and hold circuit.
Claim 10
Dependent Claim
53 words
The apparatus of claim 8 further including clocked timing logic means for providing said square wave excitation signal and a sampling pulse synchronized therewith, said sampling pulse being applied to said sample and hold circuit for sampling said square wave output signal at said predetermined time phase of said square wave excitation signal.
Claim 11
Dependent Claim
100 words
The apparatus of claim 3 in which said output winding means comprises a sine winding and a cosine winding for providing first and second square wave output signals with amplitudes proportional to the sine and cosine, respectively, of said angular displacement of said member, said first square wave output signal being in-phase or out-of-phase with said square wave excitation signal in accordance with the polarity of the sine of said angular displacement, said second square wave output signal being in-phase or out-of-phase with said square wave excitation signal in accordance with the polarity of the cosine of said angular displacement.
Claim 12
Dependent Claim
43 words
The apparatus of claim 10 for use in a flight instrument including said member and servo means for rotatably positioning said member, said first and second square wave output signals being utilized to provide the angular displacement feedback signal for said servo means.
Claim 13
Dependent Claim
81 words
The apparatus of claim 11 in which said sampling means comprises a sample and hold circuit, said apparatus further including clocked timing logic means for providing said square wave excitation signal and a sampling pulse synchronized therewith, said sampling pulse being applied to said sample and hold circuit for sampling each of said first and second square wave output signals at said predetermined time phase of said square wave excitation signal, thereby providing first and second sampled square wave output signals.
Claim 14
Dependent Claim
37 words
The apparatus of claim 12 further including analog-to-digital conversion means responsive to said first and second sampled square wave output signals for converting said first and second sampled square wave output signals into respective equivalent digital words.
Claim 15
Dependent Claim
41 words
The apparatus of claim 11 in which said excitation means includes a resolver excitation circuit for rounding the corners of the leading edges of said square wave excitation signal to minimize ringing on said first and second square wave output signals.
Claim 16
Dependent Claim
38 words
The apparatus of claim 14 in which said resolver excitation circuit includes level shifting means for shifting the d.c. level of said square wave excitation signal to provide said square wave excitation signal with a zero d.c. component.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |