US3656017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric synchronous machine having a comb-shaped pole type rotor
Assignee: Toshiba Corp
•
Filing: 1970-09-01
•
Granted: 1972-04-11
•
Expires: 1990-09-01
Abstract
Abstract An electric synchronous machine includes a comb-shaped rotor which is rotatably mounted in a centered bore of a stator. The opposite end portions of the rotor respectively extend through cylindrical tubular members provided on end brackets of the synchronous machine to maintain a small annular air gap therebetween. Exciting coils are wound around the cylindrical tubular members to effect a D.C. excitation of the comb-shaped pole members of the rotor. The magnetic fluxes generated by the exciting coils are passed through the annular air gap to the rotor. The cylindrical tubular members also include fluid paths therein through which a pressurized fluid is ejected into the annular air gap to thereby float the rotor above the inner surface of the cylindrical tubular members during the rotation of the synchronous machine.
Inventors
- 👤 Junpei Inagaki
- 👤 Hitoshi Marumo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:38
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/08; H02K7/083; H02K19/00; H02K19/16; H02K19/22; H02K19/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
An electric synchronous machine having a comb-shaped pole type which comprises: a stator core having a stator winding; a comb-shaped pole type rotor which is rotatably mounted in a bore of said stator core; a pair of cylindrical tubular spool members respectively secured to end brackets of said machine, said spool members being positioned around the axially opposite end portions of the rotor through small gaps provided therebetween; means for ejecting pressurized fluid into said gaps to thereby cause the rotor axis to be maintained along the center axis of the spool members; and, exciting coils positioned around the spool members for generating magnetic fluxes between the pole surfaces of the rotor and the inner surface of the stator.
Claim 2
Dependent Claim
119 words
An electric synchronous machine having a comb-shaped pole type which comprises: a stator core having a stator winding; a comb-shaped pole type rotor which is rotatably mounted in a bore of said stator core; a pair of cylindrical tubular spool members respectively secured to end brackets of said machine, said spool members being positioned around the axially opposite end portions of the rotor through small gaps provided therebetween; means for ejecting pressurized fluid into said gaps to thereby cause the rotor axis to be maintained along the center axis of the spool members; and, exciting coils positioned around the spool members for generating magnetic fluxes between the pole surfaces of the rotor and the inner surface of the stator.
Claim 3
Dependent Claim
67 words
An electric synchronous machine having a comb-shaped pole type rotor according to claim 1, wherein: said fluid to be ejected into the gaps between the inner surfaces of the spool members and the surfaces of the axially opposite end portions of the rotor is a pressurized electrical insulating oil, a portion of which is introduced into the inside of said machine and then is exhausted out therefrom.
Claim 4
Dependent Claim
48 words
An electric synchronous machine having a comb-shaped pole type rotor according to claim 1, wherein: said fluid to be ejected into the gaps between the inner surfaces of the spool members and the surfaces of the axially opposite end portions of the rotor is a pressurized gaseous medium.
Claim 5
Dependent Claim
60 words
An electric synchronous machine having a comb-shaped pole type rotor according to claim 1, wherein: said pressurized fluid is ejected from the inner surfaces of the spool members to the axially opposite end portions of the rotor so as to cause the axial center axis of the rotor to be maintained along the axial center axis of said spool members.
Claim 6
Dependent Claim
69 words
An electric synchronous machine having a comb-shaped pole type rotor according to claim 1, wherein said magnetic fluxes generated by said exciting coils positioned around the spool members are passed through said gaps provided between the inner surfaces of said spool members and the axially opposite end portions of said rotor and then are fed between said pole surfaces of said rotor and the inner surface of said stator.
Claim 7
Dependent Claim
93 words
An electric synchronous machine having a comb-shaped pole type rotor according to claim 1, wherein said means for ejecting pressurized fluid into said gaps includes: an inlet provided within each of said end brackets, a plurality of radial paths located within said spool members in an angularly spaced fashion around the rotor axis and in communication with said inlets, and, a plurality of paths located within said spool members in an angularly spaced fashion and axially extending and communicating with said radial paths and a plurality of openings which open to said gaps.
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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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |