US5877606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting of synchronous machine without rotor position or speed measurement
Assignee: Boeing Co
•
Filing: 1997-02-18
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Granted: 1999-03-02
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Expires: 2017-02-18
Abstract
Abstract The method of operating a synchronous machine through estimation of the stator flux utilizing synchronous machine equations and then stabilizing the flux estimation process by providing stabilizing feedback signals with a predetermined transfer function.
Inventors
- 👤 Farhad Nozari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:13
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P6/185; H02P21/00; H02P21/14; H02P21/18; H02P21/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A method for measuring the fundamental component of a synchronous machine current comprising the steps of: measuring the instantaneous frequency of the synchronous machine voltage (ω.sub.η) by utilizing a phase lock loop; utilizing the measured instantaneous frequency of the synchronous machine voltage (ω.sub.η) as the tuned frequency of a narrow-band filter with a transfer function of 2ζω.sub.η S/(S.sup.2 +2ζω.sub.η S+ω.sub.η.sup.2) with ζ being an adjustable damping factor; then utilizing the narrow-band filter to process the measured instantaneous current of the synchronous machine and produce the fundamental component of the synchronous machine current.
Claim 2
Independent Claim
92 words
A method for measuring the fundamental component of a synchronous machine current comprising the steps of: measuring the instantaneous frequency of the synchronous machine voltage (ω.sub.η) by utilizing a phase lock loop; utilizing the measured instantaneous frequency of the synchronous machine voltage (ω.sub.η) as the tuned frequency of a narrow-band filter with a transfer function of 2ζω.sub.η S/(S.sup.2 +2ζω.sub.η S+ω.sub.η.sup.2) with ζ being an adjustable damping factor; then utilizing the narrow-band filter to process the measured instantaneous current of the synchronous machine and produce the fundamental component of the synchronous machine current.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |