Patent US5196776A successfully refreshed from Google Patents.
US5196776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveform generator for a resolver
Assignee: Lanteris Space LLC
•
Filing: 1991-04-09
•
Granted: 1993-03-23
•
Expires: 2011-04-09
Abstract
Abstract A waveform generator for a resolver transducer or the like is described. Such generator forms two 3-level waveforms which approximate sinusoidal waveforms for the excitation and/or output detection of such a resolver. Each of the sinusoidal waveforms is formed by combining a pair of digitally programmed bi-state signals which have their phases shifted relative to one another by an amount proportional to an angular input variable. The result is that the amplitude of these sinusoidal waveforms which are formed are representative of the sine and cosine of such variable.
Inventors
- 👤 Marcus M. Shipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:21
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/204; G01D5/2073; G01D5/208
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
225 words
A waveform generator for a resolver comprising: means for forming a first bi-state electrical input signal approximating a first sinusoidal waveform having a first phase; means for forming a second bi-state electrical input signal approximating a second sinusoidal waveform having generally the same frequency as said first sinusoidal waveform and a second phase having a first phase relationship with said first phase that is proportional to a first value of an input variable; means for summing said first and second bi-state electrical signals while said first phase relationship therebetween is maintained, thereby to generate a first 3-level electrical output signal representative of a third sinusoidal waveform having a maximum amplitude proportional to a sine of said variable; means for forming a third bi-state electrical input signal approximating a fourth sinusoidal waveform having a third phase; means for forming a fourth bi-state electrical input signal approximating a fifth sinusoidal waveform having generally the same frequency as said fourth sinusoidal waveform and a fourth phase having a second phase relationship with said third phase proportional to a second value of said variable; and means for summing said third and fourth bi-state electrical signals while said second phase relationship therebetween is maintained, thereby to generate a second 3-level electrical output signal representative of a sixth sinusoidal waveform having a maximum amplitude proportional to a cosine of said variable.
Claim 2
Dependent Claim
225 words
A waveform generator for a resolver comprising: means for forming a first bi-state electrical input signal approximating a first sinusoidal waveform having a first phase; means for forming a second bi-state electrical input signal approximating a second sinusoidal waveform having generally the same frequency as said first sinusoidal waveform and a second phase having a first phase relationship with said first phase that is proportional to a first value of an input variable; means for summing said first and second bi-state electrical signals while said first phase relationship therebetween is maintained, thereby to generate a first 3-level electrical output signal representative of a third sinusoidal waveform having a maximum amplitude proportional to a sine of said variable; means for forming a third bi-state electrical input signal approximating a fourth sinusoidal waveform having a third phase; means for forming a fourth bi-state electrical input signal approximating a fifth sinusoidal waveform having generally the same frequency as said fourth sinusoidal waveform and a fourth phase having a second phase relationship with said third phase proportional to a second value of said variable; and means for summing said third and fourth bi-state electrical signals while said second phase relationship therebetween is maintained, thereby to generate a second 3-level electrical output signal representative of a sixth sinusoidal waveform having a maximum amplitude proportional to a cosine of said variable.
Claim 3
Dependent Claim
33 words
The waveform generator of claim 1 further including means for separately exciting individual ones of a pair of stators of a resolver with respective ones of said first and second 3-level electrical signals.
Claim 4
Dependent Claim
45 words
The waveform generator of claim 1 further including means for respectively combining each of said 3-level electrical signals with a respective one of the outputs of a pair of stators of a resolver to enable the first value of said input variable to be calculated.
References Cited (Backward Citations)
US3027516A
Cited
US3083323A
Cited
US3475626A
Cited
US3634838A
Cited
US3577088A
Cited
US3710223A
Cited
US3701936A
Cited
US3914760A
Cited
US3812433A
Cited
US3990062A
Cited
US4070665A
Cited
US4109189A
Cited
US4134106A
Cited
US4093903A
Cited
US4390865A
Cited
US4272818A
Cited
US4319172A
Cited
US4527120A
Cited
US4429267A
Cited
US4449117A
Cited
US4467320A
Cited
US4644184A
Cited
US4514689A
Cited
US4607229A
Cited
US4695804A
Cited
US4737724A
Cited
US4795954A
Cited
US4868428A
Cited
US4843291A
Cited
US4922175A
Cited
US4808936A
Cited
US4906909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |