US4774429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for a superconducting rotating electric machine
Assignee: Mitsubishi Electric Corp
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Filing: 1987-09-04
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Granted: 1988-09-27
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Expires: 2007-09-04
Abstract
Abstract A rotor for a superconducting rotating electric machine has pre-wound rotor coils housed in longitudinally-extending slots formed in a coil-carrying shaft. Each coil is restrained against circumferential forces by a plurality of rigid restraining members which are inserted between one side of the coil and the side of the slot in which the coil is housed. The restraining members are disposed on top of one another in layers corresponding to the number of layers in the coils. Preferably, they are made of an electrically-insulating material. A plurality of longitudinally-aligned restraining members may be employed for each layer of the coil. The restraining members for each layer may be disposed with gaps left therebetween in the longtudinal direction and packings disposed in the gaps.
Inventors
- 👤 Akinori Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:19
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/46; H02K3/48; H02K55/00; H02K55/02; H02K55/04; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A rotor for a superconducting rotating electric machine comprising: a cylindrical coil-carrying shaft having a plurality of longitudinally-extending slots for coils formed therein: a plurality of rotor coils each having a plurality of layers and two parallel longitudinally-extending portions, each of said longitudinally-extending portions being disposed in one of said slots; and a plurality of restraining members which are press-fit into each slot in the longitudinal direction of the slot between one side of the slot and the side of the coil disposed therein, said restraining members being disposed on top of one another for the depth of the coil in layers corresponding to the number of layers of the coil.
Claim 2
Dependent Claim
111 words
A rotor for a superconducting rotating electric machine comprising: a cylindrical coil-carrying shaft having a plurality of longitudinally-extending slots for coils formed therein: a plurality of rotor coils each having a plurality of layers and two parallel longitudinally-extending portions, each of said longitudinally-extending portions being disposed in one of said slots; and a plurality of restraining members which are press-fit into each slot in the longitudinal direction of the slot between one side of the slot and the side of the coil disposed therein, said restraining members being disposed on top of one another for the depth of the coil in layers corresponding to the number of layers of the coil.
Claim 3
Dependent Claim
32 words
A rotor as claimed in claim 1, wherein each layer of said restraining members comprises a plurality of said restraining members which are aligned in the longitudinal direction of said coil-carrying shaft.
Claim 4
Dependent Claim
37 words
A rotor as claimed in claim 2, wherein: gaps are provided in the longitudinal direction between the restraining members in each layer of restraining members; and said rotor further comprises packings which are inserted into said gaps.
Claim 5
Dependent Claim
26 words
A rotor as claimed in claim 3, wherein said packings comprise a material which is flexible at the time of installation and which hardens with time.
Claim 6
Dependent Claim
18 words
A rotor as claimed in claim 4, wherein said packings are made of felt impregnated with a resin.
Claim 7
Dependent Claim
21 words
A rotor as claimed in claim 1, wherein each of said restraining members comprises a prismatic block of a rigid material.
Claim 8
Dependent Claim
18 words
A rotor as claimed in claim 1, wherein each of said restraining members comprises at least one wedge.
Claim 9
Dependent Claim
15 words
A rotor as claimed in claim 1, wherein said restraining members comprise an electrically-insulating material.
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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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |