US4689592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined transformer and inductor
Assignee: Northrop Grumman Innovation Systems LLC
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Filing: 1985-04-12
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Granted: 1987-08-25
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Expires: 2005-04-12
Abstract
Abstract A single electromagnetic structure comprising a pair of assembled oppositely positioned pot cores, first and second winding means around each of the pedestals of the cores, and a flat magnetically permeable washer-like member positioned between the windings and spaced from the pedestals and the outer annular rim portions of the pot cores to define a pair of air gaps, whereby the apparatus functions like a transformer and an inductor in series with a winding of the transformer.
Inventors
- 👤 Charles S. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:49
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/08; H01F17/00; H01F17/04; H01F17/043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
324 words
Magnetic apparatus characterized by having (in a single, unitary coil and winding means structure) the electromagnetic equivalent of (i) an electrical transformer and (ii) an electrical inductor in series circuit relationship with a winding of said transformer, said magnetic apparatus comprising: (a) a housing means of high magnetically permeable material having first and second pot cores, each of said pot cores having a circularly shaped base, a peripheral annular wall integral with said base and extending axially from said base to an annular rim surface, and a central pedestal integral with said base and extending axially from the center portion of said base to a pedestal end surface, said pot cores being assembled in abutting relationship with said ring surfaces and said pedestal end surfaces being respectively in direct contact, (b) a first winding means positioned between said pedestal and said annular wall of said first pot core so as to encircle the pedestal thereof, (c) a second winding means positioned between said pedestal and said annular wall of said second pot core so as to encircle the pedestal thereof, and (d) a flat washer-like member of high magnetically permeable material having an outer diameter selected to be less than the inner diameter of said annular walls adjacent to said abutting rim surfaces and a central circular aperture having a diameter selected to be greater than the diameter of said pedestals, said washer-like member being positioned between said windings and spaced from said walls and said pedestals, a pair of air gaps being thus defined between (i) said outer diameter of said washer-like member and said inner surface of said annular walls, and (ii) said central circular aperture of said washer-like member and said pedestals, whereby said apparatus functions upon one of said winding means being energized by alternating electric current as both (i) an electrical transformer having a pair of windings, and (ii) an inductor connected in series with one of said windings.
Claim 2
Dependent Claim
324 words
Magnetic apparatus characterized by having (in a single, unitary coil and winding means structure) the electromagnetic equivalent of (i) an electrical transformer and (ii) an electrical inductor in series circuit relationship with a winding of said transformer, said magnetic apparatus comprising: (a) a housing means of high magnetically permeable material having first and second pot cores, each of said pot cores having a circularly shaped base, a peripheral annular wall integral with said base and extending axially from said base to an annular rim surface, and a central pedestal integral with said base and extending axially from the center portion of said base to a pedestal end surface, said pot cores being assembled in abutting relationship with said ring surfaces and said pedestal end surfaces being respectively in direct contact, (b) a first winding means positioned between said pedestal and said annular wall of said first pot core so as to encircle the pedestal thereof, (c) a second winding means positioned between said pedestal and said annular wall of said second pot core so as to encircle the pedestal thereof, and (d) a flat washer-like member of high magnetically permeable material having an outer diameter selected to be less than the inner diameter of said annular walls adjacent to said abutting rim surfaces and a central circular aperture having a diameter selected to be greater than the diameter of said pedestals, said washer-like member being positioned between said windings and spaced from said walls and said pedestals, a pair of air gaps being thus defined between (i) said outer diameter of said washer-like member and said inner surface of said annular walls, and (ii) said central circular aperture of said washer-like member and said pedestals, whereby said apparatus functions upon one of said winding means being energized by alternating electric current as both (i) an electrical transformer having a pair of windings, and (ii) an inductor connected in series with one of said windings.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |