US3824683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing corona in a dynamoelectric machine
Assignee: General Electric Co
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Filing: 1973-08-13
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Granted: 1974-07-23
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Expires: 1993-08-13
Abstract
Abstract A method of reducing corona in a dynamoelectric machine is provided wherein electrically conductive paint is applied to the sides of stator winding bars and the sides of stator slots in contact therewith while the conductor bars are operably mounted within the stator slots. In addition, electrically conductive paths are formed between pre-selected portions of the conductor bars and the magnetic stator punchings adjacent thereto by positioning bodies of electrically conductive silicone rubber between each of the selected points on the conductor bars and the adjacent stator punchings. Means are provided for efficiently positioning the bodies of silicone rubber in operating position and then curing the rubber to assure its stability.
Inventors
- 👤 R Rhudy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:10
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/32; H02K3/40; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
51 words
An invention as defined in claim 1 including the following steps: 4b. positioning a plurality of first elongated, generally flat, removable spacer members respectively between each conductor bar and the groups of punchings at said preselected points, before inserting the dispenser of conductive elastomer into the air ducts at said points,
Claim 2
Dependent Claim
42 words
applying a sealing means around the ends of the conductor bars in each slot at the junction of the bars with the bottom end of the slot in which they are mounted, thereby to effectively seal said bottom end of each slot,
Claim 3
Dependent Claim
53 words
An invention as defined in claim 2 including the following step: 4c. positioning a first U-shaped strip of sheeting material around a major portion of each of said first spacer members to substantially cover the flat sides thereof, before the dispenser of conductive elastomer is inserted into the air ducts at said points.
Claim 4
Dependent Claim
36 words
inserting a solvent dispenser between each of the groups of punchings into said air ducts adjacent each of the conductor bars, and applying solvent from said dispenser to the upright sides of each of the bars,
Claim 5
Dependent Claim
46 words
inserting a paint dispenser between each of the groups of punchings into said air ducts adjacent each of the conductor bars, and applying electrically conductive paint from said paint dispenser to the upright sides of each of the bars, 4a. allowing said conductive paint to cure,
Claim 6
Dependent Claim
11 words
An invention as defined in claim 3 including the following step:
Claim 7
Dependent Claim
67 words
inserting a dispenser filled with electrically conductive elastomer into the air ducts between pre-selected groups of punchings aT points, respectively, near the centers of the conductor bars and the respective ends thereof, and applying conductive elastomer from said dispenser to form a plurality of electrically conductive paths with said elastomer, between each of the bars, respectively, and the groups of punchings immediately adjacent each of said points,
Claim 8
Dependent Claim
69 words
An invention as defined in claim 4 including the following steps: 4d. positioning a second U-shaped strip of sheeting material between the sides of each of said first strips of sheeting material and the respective spacer members associated therewith, before the conductive elastomer is inserted into the air ducts, thereby to shield the conductive elastomer from said second strip of sheeting material with the first strips of sheeting material.
Claim 9
Dependent Claim
52 words
An invention as defined in claim 5 including the following steps: 4e. positioning a second elongated, generally flat, removable spacer member between one of the adjacent sides of said first and second U-shaped strips of sheeting material, before the dispenser of conductive elastomer is inserted into the air ducts at said points,
Claim 10
Dependent Claim
11 words
removing said sealing means from the ends of the conductor bars.
Claim 11
Dependent Claim
43 words
removing each of said first removable spacer members after the conductive elastomer is applied in said air ducts, thereby to form an air passageway through each of said electrically conductive paths of elastomer comprising, respectively, the spaces formerly occupied by said spacer members.
Claim 12
Dependent Claim
43 words
An invention as defined in claim 6 wherein each of said second spacer members is substantially thinner in cross-section than the first spacer member positioned in the same air duct therewith, and is positioned below said first spacer member in said air duct.
Claim 13
Dependent Claim
35 words
An invention as defined in claim 7 wherein said conductive elastomer comprises at least 20 percent by weight electrically conductive carbon and at least 50 percent by weight silicone rubber, the remainder comprising filler materials.
Claim 14
Dependent Claim
26 words
removing a major part of said first strip of sheeting material from each of the air passageways after the conductive elastomer is at least partially cured.
Claim 15
Dependent Claim
30 words
removing each of said second strips of sheeting material and the first spacing member associated therewith from between the sides of the respective first strips of sheeting material positioned therearound.
Claim 16
Dependent Claim
57 words
The invention defined in claim 5 wherein said first and second strips of sheeting material comprise a high-temperature paper that is capable of withstanding a temperature of at least 100* C without charring, said paper being sufficiently porous to permit air and water vapor to diffuse through it into the conductive elastomer, thereby to cure the elastomer.
Claim 17
Dependent Claim
34 words
removing each of said second removable spacer members from between the sides of the first strip of sheeting material surrounding it after the second strip of sheeting material is removed from said air passageway.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |