US3999112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyphase frequency converter
Assignee: Westinghouse Electric Corp
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Filing: 1975-05-08
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Granted: 1976-12-21
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Expires: 1995-05-08
Abstract
Abstract The interphase reactors of an unrestricted static frequency changer are mounted on a common multilegged magnetic core without affecting the individual quality of each reactor in the operation of the frequency changer.
Inventors
- 👤 Laszlo Gyugyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:27
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/271
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
In frequency conversion apparatus wherein a plurality of bilateral power switching devices are operated in a repetitive switching pattern at a chosen repetition rate to apply successive increments of alternating voltages from a polyphase voltage source to supply at least three output terminals with current at an output frequency which is a function of the difference between the input frequency and said repetition rate, the combination of: at least three interphase reactor means respectively associated with said three output terminals, each of said interphase reactor means combining currents from two respective groups of said bilateral switching devices and having a center tap connected to a corresponding one of said three output terminals with said interphase reactor means being mounted on a common magnetic core.
Claim 2
Dependent Claim
124 words
In frequency conversion apparatus wherein a plurality of bilateral power switching devices are operated in a repetitive switching pattern at a chosen repetition rate to apply successive increments of alternating voltages from a polyphase voltage source to supply at least three output terminals with current at an output frequency which is a function of the difference between the input frequency and said repetition rate, the combination of: at least three interphase reactor means respectively associated with said three output terminals, each of said interphase reactor means combining currents from two respective groups of said bilateral switching devices and having a center tap connected to a corresponding one of said three output terminals with said interphase reactor means being mounted on a common magnetic core.
References Cited (Backward Citations)
US3707665A
Cited
US3777250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |