Patent US6859018B2 successfully refreshed from Google Patents.
US6859018B2
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US
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Wound field synchronous machine control system and method
Assignee: Transportation IP Holdings LLC
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Filing: 2003-05-02
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Granted: 2005-02-22
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Expires: 2023-05-02
Abstract
Abstract A wound field synchronous machine control system comprises: an auxiliary winding for obtaining auxiliary AC voltage from the wound field synchronous machine; a phase controlled rectifier for rectifying the auxiliary AC voltage and supplying rectified DC voltage to the wound field synchronous machine; and a controller. The controller is configured for using a voltage signal across the auxiliary winding to obtain volt-second values of the auxiliary winding and using the volt-second values for firing angle control of switches of the phase controlled rectifier. Alternatively or additionally, the controller is configured for obtaining airgap flux values of the wound field synchronous machine and using the airgap flux values for firing angle control of switches of the phase controlled rectifier.
Inventors
- 👤 Neil Richard Garrigan
- 👤 Henry Todd Young
- 👤 Bradley Allen Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:35
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305; B; B60; B60L; B60L50/00; B60L50/10; B60L2210/00; B60L2210/20; B60L2220/00; B60L2220/10; B60L2220/14; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072; Y02T10/72
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A wound field synchronous machine control system comprising: (a) alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine; (b) a rectifier for rectifying the AC phase voltages and supplying rectified DC voltage to a load; and (c) a controller for using the AC phase voltage signals to estimate a DC load voltage signal by computing a maximum instantaneous difference between any two of the AC phase voltages, obtaining a difference between a load voltage command and the estimated DC load voltage signal, and using the difference for controlling operation of the synchronous machine.
Claim 2
Dependent Claim
98 words
A wound field synchronous machine control system comprising: (a) alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine; (b) a rectifier for rectifying the AC phase voltages and supplying rectified DC voltage to a load; and (c) a controller for using the AC phase voltage signals to estimate a DC load voltage signal by computing a maximum instantaneous difference between any two of the AC phase voltages, obtaining a difference between a load voltage command and the estimated DC load voltage signal, and using the difference for controlling operation of the synchronous machine.
Claim 3
Dependent Claim
22 words
The system of claim 1 wherein the controller further comprises a low pass configured for low pass filtering the maximum instantaneous difference.
Claim 4
Dependent Claim
87 words
A wound field synchronous machine control method comprising: (a) sensing AC phase voltage signals from the machine; (b) rectifying the AC phase voltages and supplying rectified DC voltage to a load; (c) using the AC phase voltage signals to estimate a DC load voltage signal by computing a maximum instantaneous difference between any two of the AC phase voltages; (d) obtaining a difference between a load voltage command and the estimated DC load voltage signal; and (e) using the difference for controlling operation of the synchronous machine.
Claim 5
Dependent Claim
87 words
A wound field synchronous machine control method comprising: (a) sensing AC phase voltage signals from the machine; (b) rectifying the AC phase voltages and supplying rectified DC voltage to a load; (c) using the AC phase voltage signals to estimate a DC load voltage signal by computing a maximum instantaneous difference between any two of the AC phase voltages; (d) obtaining a difference between a load voltage command and the estimated DC load voltage signal; and (e) using the difference for controlling operation of the synchronous machine.
Claim 6
Dependent Claim
28 words
The method of claim 3 wherein using the AC phase voltage signals to estimate the DC load voltage signal further comprises low pass filtering the maximum instantaneous difference.
Claim 7
Dependent Claim
53 words
A wound field synchronous machine control system comprising; alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine; and a controller for using the AC phase voltage signals to estimate a DC load voltage signal by computing a maximum instantaneous difference between any two of the AC phase voltages.
Claim 8
Dependent Claim
53 words
A wound field synchronous machine control system comprising; alternating current (AC) voltage sensors for sensing AC phase voltage signals from the machine; and a controller for using the AC phase voltage signals to estimate a DC load voltage signal by computing a maximum instantaneous difference between any two of the AC phase voltages.
Claim 9
Dependent Claim
23 words
The system of claim 5 wherein the controller further comprises a low pass filter configured for low pass filtering the maximum instantaneous difference.
References Cited (Backward Citations)
US4085823A
Cited
US4218729A
Cited
US4468603A
Cited
US4495449A
Cited
US4719362A
Cited
US4719361A
Cited
US5027285A
Cited
US5325043A
Cited
US5194801A
Cited
US5483147A
Cited
US5300842A
Cited
US5539651A
Cited
US6175217B1
Cited
US5729113A
Cited
US6011357A
Cited
US6072302A
Cited
US6411065B1
Cited
US6081084A
Cited
US6486568B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-02-22 | 2008-08-23 | 2009-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-02-22 | 2012-08-23 | 2013-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-02-22 | 2016-08-23 | 2017-02-22 | $7700.00 | Window Closed / Lapsed |