US3916229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor for superconducting synchronous/asynchronous motor
Assignee: United States Department of the Navy
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Filing: 1975-01-03
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Granted: 1975-10-28
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Expires: 1995-01-03
Abstract
Abstract An induction motor structure for use on the outside of a superconducting rotor comprising a cylindrical shell of solid and laminated, magnetic iron with squirrel cage windings embedded in the outer circumference of said shell. The sections of the shell between the superconducting windings of the rotor are solid magnetic iron. The sections of the shell over the superconducting windings are made of laminations of magnetic iron. These laminations are parallel to the axis of the machine and are divided in halves with the laminations in each half oriented in diagonal opposition so that the intersection of the laminations forms a V. This structure presents a relatively high reluctance to leakage flux from the superconducting windings in the synchronous operating mode, while presenting a low reluctance path to the stator flux during asynchronous operation.
Inventors
- 👤 Donald C Litz
- 👤 Iii Henry E Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
H; H02; H02K; H02K55/00; H02K55/02; H02K55/04; H02K19/00; H02K19/02; H02K19/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A rotor for a superconducting synchronous motor with an outer induction-motor structure comprising: superconducting field-winding means; magnetic-material shell means made of solid and laminated magnetic material surrounding said superconducting field winding means; induction-motor means located in the outer periphery of said magnetic shell means for asynchronous operation; said magnetic-material laminations running parallel to the axis of said superconducting field-winding means and radially above each superconducting winding of said superconducting fieldwinding means, said laminations being oriented so that a series of the lamination air gaps is presented to the flux flow during synchronous operation to provide a relatively high reluctance to any flux leakage through said induction-motor means while, during asynchronous operation, the lamination ends are presented to the flux flow so that a low reluctance path for the stator flux is provided around said induction motor means.
Claim 2
Dependent Claim
137 words
A rotor for a superconducting synchronous motor with an outer induction-motor structure comprising: superconducting field-winding means; magnetic-material shell means made of solid and laminated magnetic material surrounding said superconducting field winding means; induction-motor means located in the outer periphery of said magnetic shell means for asynchronous operation; said magnetic-material laminations running parallel to the axis of said superconducting field-winding means and radially above each superconducting winding of said superconducting fieldwinding means, said laminations being oriented so that a series of the lamination air gaps is presented to the flux flow during synchronous operation to provide a relatively high reluctance to any flux leakage through said induction-motor means while, during asynchronous operation, the lamination ends are presented to the flux flow so that a low reluctance path for the stator flux is provided around said induction motor means.
Claim 3
Dependent Claim
44 words
A rotor as defined in claim 1 wherein said laminations located radially above each superconducting winding are divided and oriented into at least two opposing diagonals so that the intersections of the divided laminations present a closed, essentially convex surface to said superconducting windings.
Claim 4
Dependent Claim
48 words
A rotor as defined in claim 1 wherein said laminations located radially above each superconducting winding are divided in halves, with the laminations in each half oriented in diagonal opposition so that the intersection of the laminations forms a V with its intersection pointing at said superconducting winding.
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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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |