Dynamoelectric machine slot wedges with abrasion resistant layer
First Claim
1. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
- a wedge;
said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively;
said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces;
said wedge being made of a glass fiber in a cured resin matrix;
a first embedding layer on said first angled bearing surface;
a second embedding layer on said second angled bearing surface;
said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively;
each of said first and second embedding layers including a fiber in a resin matrix;
said fiber being a non-abrasive fiber; and
said first and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said non-abrasive fiber is a cotton fiber.
1 Assignment
0 Petitions
Accused Products
Abstract
A dovetail wedge for retaining conductor bars in stator slots of a large dynamoelectric machine includes an embedding surface layer on surfaces thereof which contact the lamination surfaces in dovetail slots of the stator. The embedding surface layer permits the embossing thereof by irregularities of the surface of the laminations. A range of thicknesses for the embedding layer provides sufficient protection against abrasion and a sufficient lubricity during wedge installation without being so thick that long-term dimensional instability may permit loosening of the conductor bars. The embedding layer is preferably a natural fiber and most preferably a woven or non-woven cotton fiber.
70 Citations
30 Claims
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1. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said non-abrasive fiber is a cotton fiber. - View Dependent Claims (2)
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3. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedidng layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said non-abrasive fiber is a natural fiber. - View Dependent Claims (4, 5, 6, 7, 30)
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8. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said non-abrasive fiber is a synthetic resin fiber.
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9. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a pluralty of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and scond angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said non-abrasive fiber is a woven fiber.
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10. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and econd angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said non-abrasive fiber is a natural fiber with a minor amount of a synthetic fiber. - View Dependent Claims (11)
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12. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first1and second embedding layers having a thickness of from about 0.005 to about 0.1 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber wherein said cured resin matrix includes a proportion of lubricating particles.
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13. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; each of said first and second embedding layers including a fiber in a resin matrix; said fiber being a non-abrasive fiber; and said first and second embedding layers having a thickness of from about 0.005 to about 0.02 inch whereby said laminations may be embedded within said thickness without penetrating through said embedding layer to said glass fiber.
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14. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces comprising:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; an inclined lower surface on said wedge; a slide; an inclined upper surface on said slide opposable against said inclined lower surface for urging said wedge substantially radially outward to urge said first and second angled bearing surfaces into abutment with said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; and each of said first and second embedding layers including at least one ply of a woven cotton cloth in a cured resin matrix. - View Dependent Claims (15, 16, 17)
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18. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces:
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a wedge; said wedge including first and second angled lips loosely fittable within said first and second dovetail slots respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; said wedge being made of a glass fiber in a cured resin matrix; a first layer on said first angled bearing surface; a second layer on said second angled bearing surface; said first and second layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; and each of said first and second layers including a natural fiber in a cured resin matrix. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A dovetail wedge for use in a slot in a dynamoelectric machine, said slot being formed by aligned stacking of a plurality of laminations each having a corresponding slot therein, said slot including at least one dovetail slot therein, said at least one dovetail slot including first and second angled abutment surfaces comprising:
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a wedge; said wedge including first and second angled lips fittable within said first and second dovetail slot, respectively; said first and second angled lips including first and second angled bearing surfaces respectively disposed at angles corresponding to angles of said first and second angled abutment surfaces; an inclined lower surface on said wedge; a slide; an inclined upper surface on said slide opposable against said inclined lower surface for urging said wedge substantially radially outward to urge said first and second angled bearing surfaces into abutment with said first and second angled abutment surfaces; a first embedding layer on said first angled bearing surface; a second embedding layer on said second angled bearing surface; said first and second embedding layers being effective to separate said first and second angled bearing surfaces from said first and second angled abutment surfaces respectively; and each of said first and second embedding layers including a film of a synthetic resin.
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Specification