Patent US3728655A successfully refreshed from Google Patents.
US3728655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medium frequency transformer
Assignee: SMS Elotherm GmbH
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Filing: 1972-06-20
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Granted: 1973-04-17
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Expires: 1992-06-20
Abstract
Abstract A medium frequency transformer having a single layer flat secondary winding, two flat layers forming a primary winding, and placed face to face, and a plurality of ferrite core members. According to this invention the faces of the secondary winding and of the primary winding layers each include two band shaped zones which are connected at their ends by U-shaped zones. The core members are stacked to form hollow columns embracing the parallel band-shaped zones. A clamping member is mounted at each end of the core stack columns.
Inventors
- 👤 F Reinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:33
CPC Classifications
H; H01; H01F; H01F30/00; H01F30/06; H01F30/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
In a transformer having a single layer flat secondary winding, two flat layers of a primary winding placed face to face and forming a stack, and a plurality of core members embracing the conductors of the windings so that the overall dimensions of the transformer in a direction normal to the faces of the secondary respectively primary windings is small in relation to its overall dimensions in a direction parallel to said faces, the improvement wherein the faces of the secondary winding and of the primary winding layers each comprise two parallel band-shaped zones which are connected at their ends by U-shaped zones said frame-like core elements are stacked to form hollow columns embracing the parallel band-shaped zones of the faces of the respective winding layers and a clamping member is provided at each end of the columns for securing the stack of magnetic cores.
Claim 2
Dependent Claim
145 words
In a transformer having a single layer flat secondary winding, two flat layers of a primary winding placed face to face and forming a stack, and a plurality of core members embracing the conductors of the windings so that the overall dimensions of the transformer in a direction normal to the faces of the secondary respectively primary windings is small in relation to its overall dimensions in a direction parallel to said faces, the improvement wherein the faces of the secondary winding and of the primary winding layers each comprise two parallel band-shaped zones which are connected at their ends by U-shaped zones said frame-like core elements are stacked to form hollow columns embracing the parallel band-shaped zones of the faces of the respective winding layers and a clamping member is provided at each end of the columns for securing the stack of magnetic cores.
Claim 3
Dependent Claim
28 words
A transformer according to claim 1, wherein the primary connections are taken out through one of the clamping members and the secondary connections through the other clamping member.
Claim 4
Dependent Claim
44 words
A transformer according to claim 2, wherein the clamping member at the primary terminal end contains two terminal bars which are each electrically connected by a contact bridge to a point of the primary winding layers on an outside face of the winding stack.
Claim 5
Dependent Claim
35 words
A transformer according to claim 3, wherein the points that are electrically contacted by the contact bridges are located at least near the extreme ends of the primary winding layers to serve as intermediate taps.
Claim 6
Dependent Claim
35 words
A transformer according to claim 4, wherein the overall thickness of the flat secondary winding layer in the region of the connections where the conductors overlap at least does not significantly exceed its thickness elsewhere.
Claim 7
Dependent Claim
25 words
A transformer according to claim 5, wherein the secondary winding consists of several hollow section conductors electrically connected in parallel and coiled in one layer.
Claim 8
Dependent Claim
39 words
A transformer according to claim 6, wherein the interiors of the hollow section electrically parallel-connected conductors of the secondary winding are at least partly connected in series in so far as the flow of the coolant therethrough is concerned.
Claim 9
Dependent Claim
12 words
A transformer according to claim 7 wherein said core members are ferrite.
Claim 10
Dependent Claim
102 words
A transformer comprising: a single layer flat secondary coil having two parallel band-shaped zones connected together at their ends by U-shaped zones, two flat layers forming a primary coil and each having two parallel band-shaped zones connected together at their ends by U-shaped zones, said layers forming said primary and secondary coils being disposed face to face to form a stack, a plurality of core members stacked to form at least two hollow columns each substantially surrounding a U-shaped zone of each of said layers and means at each end of said column for securing the stacked core members in that column.
Claim 11
Dependent Claim
102 words
A transformer comprising: a single layer flat secondary coil having two parallel band-shaped zones connected together at their ends by U-shaped zones, two flat layers forming a primary coil and each having two parallel band-shaped zones connected together at their ends by U-shaped zones, said layers forming said primary and secondary coils being disposed face to face to form a stack, a plurality of core members stacked to form at least two hollow columns each substantially surrounding a U-shaped zone of each of said layers and means at each end of said column for securing the stacked core members in that column.
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |