Abstract For retention of coils in cores of large dynamo-electric machines, a side filler is used between the insulated coil and the core slot wall with different surface characteristics on each side of the side filler. The surface adjacent the slot wall has a coefficient of friction that is relatively high compared with the coefficient of friction of the surface adjacent the coil. The surface adjacent the slot wall also tends to have a greater degree of adhesion with the slot wall under heat and pressure, than does the surface of the side filler adjacent the coil. These qualities can be provided by employing as the side filler a member having a surface comprising a fluorocarbon polymer adjacent the coil while the other surface includes a different, more conventional, resinous material. The combination of the invention permits free movement of the coil during thermal cycling without tending to remove the side filler from the slot and without damaging the coil insulation.
Inventors
👤 Leonard B Simmonds
👤 John C Botts
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-30 20:37
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/46; H02K3/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A dynamoelectric machine comprising: a core having a core slot at a periphery thereof; an insulated coil disposed in said core slot; a side filler disposed in said slot between each side of said coil and the adjacent core surface, each said filler having a surface adjacent said coil that has a coefficient of friction less than the coefficient of friction of the surface of said side filler adjacent said core surface, each said side filler comprising a laminate of which a first portion which is at said surface adjacent said coil comprises a glass fiber material impregnated with a fluorocarbon polymer.
Claim 2
Dependent Claim
102 words
A dynamoelectric machine comprising: a core having a core slot at a periphery thereof; an insulated coil disposed in said core slot; a side filler disposed in said slot between each side of said coil and the adjacent core surface, each said filler having a surface adjacent said coil that has a coefficient of friction less than the coefficient of friction of the surface of said side filler adjacent said core surface, each said side filler comprising a laminate of which a first portion which is at said surface adjacent said coil comprises a glass fiber material impregnated with a fluorocarbon polymer.
Claim 3
Dependent Claim
39 words
The subject matter of claim 1 wherein: the coefficient of friction of said side filler surface adjacent said coil is no more than about 60 percent of the coefficient of friction of said side filler adjacent said core surface.
Claim 4
Dependent Claim
25 words
The subject matter of claim 2 wherein: the coefficient of friction of said side filler surface adjacent said coil is no more than about 0.13.
Claim 5
Dependent Claim
12 words
The subject matter of claim 1 wherein: said fluorocarbon polymer is polytetrafluoroethylene.
Claim 6
Dependent Claim
40 words
The subject matter of claim 1 wherein: said laminate comprises a second portion adjacent said core surface that is of a glass fiber material impregnated with a resin selected from the group consisting of epoxy, phenolic and melamine type resins.
Claim 7
Dependent Claim
24 words
The subject matter of claim 5 wherein said second portion has a thickness about two to four times the thickness of said first portion.
Claim 8
Dependent Claim
18 words
The subject matter of claim 5 wherein: said first and second portions include particles of conductive filler material.