Patent US3660702A successfully refreshed from Google Patents.
US3660702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-cooled rotor for rotary electric machines
Assignee: Hitachi Ltd
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Filing: 1971-05-04
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Granted: 1972-05-02
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Expires: 1991-05-04
Abstract
Abstract A direct-cooled rotor for rotary electric machines in which the rotor coils are formed with radial vents to allow cooling gas to flow out therethrough for direct cooling of the coils, said vents being radially defined by the coils in such a manner that in the axially central portions of the rotor body they extend uprightly outward and in the rest of the rotor body they extend inclinedly toward the central holes, some inclined vents adjacent each central hole communicating at one ends to said central hole in a herringbone pattern, so that the rotor can be evenly cooled across the lengths of coils set in the rotor body.
Inventors
- 👤 Tatsuo Kishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:19
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A direct-cooled rotor for rotary electric machines which comprises a rotor shaft carrying a rotor body, said rotor body being formed with axially extending coil slots near the periphery thereof, each of said slots having a ventilating groove at the bottom, coils accommodated in said coil slots, each of said coils being provided with a plurality of radially extending vents disposed at desirable intervals axially of the rotor body, and wedges formed with holes to match the vents of said coils, said vents being so distributed that, in each coil slot, the vent in the axially middle portion of the body extends radially upright while all other vents are inclined toward the central vent, the vents neighboring the central vent intersecting or communicating therewith in a herringbone pattern.
Claim 2
Dependent Claim
128 words
A direct-cooled rotor for rotary electric machines which comprises a rotor shaft carrying a rotor body, said rotor body being formed with axially extending coil slots near the periphery thereof, each of said slots having a ventilating groove at the bottom, coils accommodated in said coil slots, each of said coils being provided with a plurality of radially extending vents disposed at desirable intervals axially of the rotor body, and wedges formed with holes to match the vents of said coils, said vents being so distributed that, in each coil slot, the vent in the axially middle portion of the body extends radially upright while all other vents are inclined toward the central vent, the vents neighboring the central vent intersecting or communicating therewith in a herringbone pattern.
Claim 3
Dependent Claim
53 words
A direct-cooled rotor for rotary electric machines according to claim 1 wherein a plurality of vents formed in and about the axial middle portion of the body are radially upright, while other vents are formed so as to incline against the upright vents, the neighboring vents intersecting the nearer or nearest upright vent.
Claim 4
Dependent Claim
46 words
A direct-cooled rotor for rotary electric machines according to claim 1 wherein the vents formed in the coils are inclined toward the middle portion of the rotor body in such a manner that they intersect one another in and about the middle portion of the body.
Claim 5
Dependent Claim
47 words
A direct-cooled rotor for rotary electric machines according to claim 1 wherein the vents formed in the coils are inclined toward the middle portion of the rotor body and the vents formed near the body ends extend through the coil ends disposed in the coil retaining rings.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |