Patent US3838502A successfully refreshed from Google Patents.
US3838502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of encapsulating random wound stator coils for a dynamoelectric machine
Assignee: General Electric Co
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Filing: 1973-10-16
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Granted: 1974-10-01
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Expires: 1993-10-16
Abstract
Abstract A method is provided for mounting the sides of random wound stator coils in relatively stiff, straight-sided slot tubes so that the coils are easier to handle and safer from damage to their insulation when the coils are being mounted in stator slots of a dynamoelectric machine.
Inventors
- 👤 M Sheets
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:05
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/4902; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
237 words
A process of manufacturing a dynamoelectric machine stator comprising: a. providing a stator core having a rotor-receiving bore therein and a plurality of axially extending open slots in said core circumferentially spaced about said bore, b. providing a plurality of random wound coils of insulated magnet wire, c. providing a plurality of elongated substantially straightsided slot tubes formed of insulating material, each of said slot tubes being foremd with overlapping longitudinal edges that are separable to enable one side of one of said coils to be received into each tube, d. positioning two of said slot tubes, respectively, around spaced-apart side portions of each of said coils, e. wrapped porous insulating tape completely around end portions of said coils located, respectively, between said side portions, f. securing the overlapping edges of each of the slot tubes positioned around the coil side portions in a position that holds the tubes tightly closed around said side portions to retain them in a substantially straight configuration within the tubes, g. positioning said coils in corresponding slots and making suitable connections to constitute a motor winding, h. vacuum impregnating said stator core having said motor winding therein with a viscous thermosettable resin, i. heating the impregnated stator core to set said resin and concomitantly retaining resin inside said coils by means of said tape and said tubes while draining substantially all of the remainder of said resin from said stator core.
Claim 2
Dependent Claim
237 words
A process of manufacturing a dynamoelectric machine stator comprising: a. providing a stator core having a rotor-receiving bore therein and a plurality of axially extending open slots in said core circumferentially spaced about said bore, b. providing a plurality of random wound coils of insulated magnet wire, c. providing a plurality of elongated substantially straightsided slot tubes formed of insulating material, each of said slot tubes being foremd with overlapping longitudinal edges that are separable to enable one side of one of said coils to be received into each tube, d. positioning two of said slot tubes, respectively, around spaced-apart side portions of each of said coils, e. wrapped porous insulating tape completely around end portions of said coils located, respectively, between said side portions, f. securing the overlapping edges of each of the slot tubes positioned around the coil side portions in a position that holds the tubes tightly closed around said side portions to retain them in a substantially straight configuration within the tubes, g. positioning said coils in corresponding slots and making suitable connections to constitute a motor winding, h. vacuum impregnating said stator core having said motor winding therein with a viscous thermosettable resin, i. heating the impregnated stator core to set said resin and concomitantly retaining resin inside said coils by means of said tape and said tubes while draining substantially all of the remainder of said resin from said stator core.
Claim 3
Dependent Claim
48 words
An invention as defined in claim 1 including: d.-1. positioning the two slot tubes on each coil so that the straight sides of the respective tubes on each coil are substantially parallel to one another before the longitudinal edges of the tubes are secured in their overlapping position.
Claim 4
Dependent Claim
47 words
An invention as defined in claim 2 including: e-1. wrapping the respective ends of the insulating tapes that are wrapped around the end portions of said coils around the ends of said slot tubes thereby to tightly secure the ends of the tubes in their overlapping relationship.
Claim 5
Dependent Claim
32 words
An invention as defined in claim 3 including: e-2. placing a self-curing glue between the overlapped edges of each of said slot tubes at the central portions thereof to secure them together.
Claim 6
Dependent Claim
15 words
An invention s defined in claim 4 wherein said glue is an air-cured epoxy glue.
Claim 7
Dependent Claim
29 words
An invention as defined in claim 4 wherein said central portion of the overlapping edges of said slot tubes comprises at least one-third of the length of said tube.
Claim 8
Dependent Claim
42 words
An invention as defined in claim 2 including: d-2. wrapping porous insulating tape around each of the slot tubes mounted on said coil side portions, thereby to secure the overlapping edges of the slot tubes tightly closed around the coil side portions.
Claim 9
Dependent Claim
40 words
An invention as defined in claim 7 including the step of providing an adhesive on the insulating tape wrapped around each of said slot tubes, thereby to render the tape effective to hold the tubes in said tightly closed position.
Claim 10
Dependent Claim
38 words
An invention as defined in claim 7 including wrapping the insulating tape around each of said slot tubes in a butt-winding pattern, and winding the insulating tape around the end portions of said coils in a lap-winding pattern.
Claim 11
Dependent Claim
46 words
An invention as defined in claim 9 wherein the butt-wound tape on said slot tubes is applied before the lap-wound tape on the end coils is extended over the ends of the tubes thereby causing it to overlap and secure the ends of the butt-wound tape.
Claim 12
Dependent Claim
20 words
An invention as defined in claim 2 including: c-1. providing each of said slot tubes with generally flat side walls.
Claim 13
Dependent Claim
21 words
An invention as defined in claim 11 including: c-2. providing each of said slot tubes with a generally flat bottom wall.
Claim 14
Dependent Claim
43 words
An invention as defined in claim 12 including: g-1. positioning the coils in said stator slots with the generally flat bottom wall of at least one of the respective slot tubes in each slot being disposed adjacent the bottom of its respective slot.
Claim 15
Dependent Claim
36 words
An invention as defined in claim 1 wherein said resin includes a filler material therein, and wherein the pores in said tape are filled with the filler material concomitantly with the vacuum-impregnation of the stator core.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |