US3778649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor winding for electrical machines with grooved conductors
Assignee: Cegelec SA
•
Filing: 1972-07-10
•
Granted: 1973-12-11
•
Expires: 1992-07-10
Abstract
Abstract The invention relates to the rotors of electrical machines, and particularly to a cooling arrangement therefor providing a circulation of cooling gas through a stack of grooved conductors. It is characterized in that the grooves in the conductors are curvilinear and the ends thereof are placed opposite each other. The invention is applicable notably to conductors disposed in rotor slots, which eliminates any risk of shearing of the conductors.
Inventors
- 👤 C Lehuen
- 👤 R Gillet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:28
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/04; H02K3/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A rotor winding for electrical machines comprising radial stacks of grooved conductors in which are formed transverse passages for a cooling gas, the inlet and the outlet of each groove being situated essentially, in the same orthogonal plane with respect to the longitudinal axis of the conductor, between the inlet and the outlet the shape of the groove being curvilinear.
Claim 2
Dependent Claim
60 words
A rotor winding for electrical machines comprising radial stacks of grooved conductors in which are formed transverse passages for a cooling gas, the inlet and the outlet of each groove being situated essentially, in the same orthogonal plane with respect to the longitudinal axis of the conductor, between the inlet and the outlet the shape of the groove being curvilinear.
Claim 3
Dependent Claim
37 words
A rotor winding for electrical machines according to claim 1 wherein the conductors of the stack all have the same grooves but the grooves are disposed, from one to the next adjacent one, in inverted longitudinal directions.
Claim 4
Dependent Claim
22 words
A rotor winding for electrical machines according to claim 1 wherein the shape of each groove is that of a circular arc.
Claim 5
Dependent Claim
21 words
A rotor winding for electrical machines according to claim 1 wherein the shape of each groove is that of a chevron.
Claim 6
Dependent Claim
56 words
A rotor winding for electrical machines according to claim 1, wherein the radial stack of grooved conductors include a plurality of conductors stacked one on another in the radial direction and the transverse passages are formed by individual grooves extending completely through a respective conductor in a direction transverse to the radially extending stack of conDuctors.
Claim 7
Dependent Claim
58 words
A rotor winding for electrical machines according to claim 5, wherein each conductor is provided with a plurality of transversely extending grooves, each groove being spaced from an adjacent groove and having a single inlet and a single outlet, the single inlet and single outlet for each groove being joined only by way of a continuous curvilinear passageway.
Claim 8
Dependent Claim
56 words
A rotor winding for electrical machines according to claim 1, wherein the transverse passages of the radial stack of conductors are arranged such that the inlet and outlet of a respective groove in each conductor in the radial stack of conductors lies in the same orthogonal plane extending perpendicular to the longitudinal axis of the conductors.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |