US3614692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable induction device
Assignee: Magnetech Industries Inc
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Filing: 1970-06-02
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Granted: 1971-10-19
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Expires: 1990-06-02
Abstract
Abstract The disclosure relates to a variable induction device or transformer of the type comprising a rectangular magnetic core having two primary transformer windings on opposite core legs and a transferable secondary winding carried by a pair of axially rotatable drums which are each mounted in telescoping relationship over an associated one of the primary transformer windings. Each drum carries a portion of the secondary winding, and the portions are connected in series opposition. The turns of the transferable secondary winding may be transferred from one drum to the other by rotating the drums in synchronism, thereby varying the effective number of transformer secondary turns. A fixed secondary winding or coil having a predetermined number of fixed turns is provided on one of the drums, and electrical connections are made to the windings on the drums by way of an induced current-cancelling commutator. All of the elements comprising the variable induction device are removably mounted and one of the core end members is removable to provide interchangeability of the elements.
Inventors
- 👤 Donald S Rozelle
- 👤 Ralph B Rozelle
- 👤 Umid R Nejib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:37
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/08; H01F29/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
240 words
A variable induction device comprising: a core of magnetic material having two substantially parallel legs; a substantially cylindrical member nonrotatably carried by each of said legs in telescoping relationship; a generally cylindrical, substantially hollow drum coaxially mounted on each of said members for axial rotation thereabout; a first electrically conductive coil having a predetermined number of fixed turns wound in a predetermined direction about one of said drums; electrical contact means carried by one end of each of said drums for rotation therewith, one of said contact means being electrically connected to one end of said first coil; an electrically conductive commutator carried by each of said lEgs in wiping engagement with said contact means; a second electrically conductive coil having a predetermined number of transferable turns wound about said drums, one end of said second coil being electrically connected to the other end of said first coil, the either end of said second coil being electrically connected to the other one of said contact means; transformer winding means carried by said cylindrical members in electrical isolation from said first and second coils and in magnetic flux linking relation to said first and second coils; and means for simultaneously axially rotating said drums about said cylindrical members to selectively modify the effective number of said fixed turns in said first coil by transferring the turns of said second coil from one of said drums to the other of said drums.
Claim 2
Dependent Claim
240 words
A variable induction device comprising: a core of magnetic material having two substantially parallel legs; a substantially cylindrical member nonrotatably carried by each of said legs in telescoping relationship; a generally cylindrical, substantially hollow drum coaxially mounted on each of said members for axial rotation thereabout; a first electrically conductive coil having a predetermined number of fixed turns wound in a predetermined direction about one of said drums; electrical contact means carried by one end of each of said drums for rotation therewith, one of said contact means being electrically connected to one end of said first coil; an electrically conductive commutator carried by each of said lEgs in wiping engagement with said contact means; a second electrically conductive coil having a predetermined number of transferable turns wound about said drums, one end of said second coil being electrically connected to the other end of said first coil, the either end of said second coil being electrically connected to the other one of said contact means; transformer winding means carried by said cylindrical members in electrical isolation from said first and second coils and in magnetic flux linking relation to said first and second coils; and means for simultaneously axially rotating said drums about said cylindrical members to selectively modify the effective number of said fixed turns in said first coil by transferring the turns of said second coil from one of said drums to the other of said drums.
Claim 3
Dependent Claim
57 words
The variable induction device of claim 1 wherein said core includes end members connected between the adjacent ends of said legs, one of said end members being removable to expose one end of each of said legs, thereby permitting the changing of said drums and said cylindrical members to achieve different electrical characteristics of said inductive device.
Claim 4
Dependent Claim
41 words
The variable induction device of claim 1 wherein said commutator comprises an electrically conductive segmented ring, the segments of said ring being electrically connected whereby currents induced in adjacent of said segments by said cyclically varying magnetic flux are substantially self-cancelling.
Claim 5
Dependent Claim
23 words
The variable induction device of claim 1 wherein said second coil is adapted to be wound about said first coil radially outward therefrom.
Claim 6
Dependent Claim
34 words
The variable induction device of claim 1 wherein said first coil is embedded in said one of said drums and said second coil is adapted to be wound about the surfaces of said drums.
Claim 7
Dependent Claim
42 words
The variable induction device of claim 1 wherein said transformer winding means comprises a primary transformer winding carried by said cylindrical members, and further including a secondary transformer winding carried by said cylindrical members in overlying relation to said primary transformer winding.
Claim 8
Dependent Claim
33 words
The variable induction device of claim 1 wherein the number of fixed turns of said first coil is equal to or greater than the total number of transferable turns of said second coil.
Claim 9
Dependent Claim
58 words
The variable induction device of claim 1 wherein the transferable turns of said second coil on said one drum are connected to the transferable drums of said second coil on the other drum in series opposition and wherein the transferable turns of said second coil on said one drum are connected to said first coil in series opposition.
Claim 10
Dependent Claim
114 words
A variable induction device comprising: a magnetic core; two spaced drums each mounted for axial rotation about said core; an electrically conductive coil having a predetermined number of fixed turns wound in a predetermined direction on one of said drums; transformer winding means carried by said core in electrical isolation from said coil for inducing a cyclically varying magnetic flux in said coil; means for axially rotating said drums; and coil means wound on both of said drums and adapted to be selectively transferred from one of said drums to the other in response to the rotation of said drums for modifying the effective number of said fixed turns of said electrically conductive coil.
Claim 11
Dependent Claim
114 words
A variable induction device comprising: a magnetic core; two spaced drums each mounted for axial rotation about said core; an electrically conductive coil having a predetermined number of fixed turns wound in a predetermined direction on one of said drums; transformer winding means carried by said core in electrical isolation from said coil for inducing a cyclically varying magnetic flux in said coil; means for axially rotating said drums; and coil means wound on both of said drums and adapted to be selectively transferred from one of said drums to the other in response to the rotation of said drums for modifying the effective number of said fixed turns of said electrically conductive coil.
Claim 12
Dependent Claim
36 words
The variable induction device of claim 9 including electrical contact means mounted on each of said drums, and a commutator mounted on said core adjacent each of said contact means and in wiping electrical contact therewith.
Claim 13
Dependent Claim
27 words
The variable induction device of claim 9 wherein said transformer winding means is carried by two spaced cylindrical members mounted on said core in telescoping relationship therewith.
Claim 14
Dependent Claim
57 words
The variable induction device of claim 11 wherein each of said drums is mounted substantially coaxially with an associated one of said cylindrical members in telescoping relationship therewith. 13. The variable induction device eof claim 11 including a secondary transformer winding of a fixed predetermined number of turns carried by at least one of said cylindrical members.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |