Casting assembly for stator coils and method
First Claim
1. A method of encapsulating a terminal portion of a coil end turn conductor which projects from the core of a dynamoelectric machine, said method comprising:
- securing a pad to said terminal portion, said pad having radially extending side portions which circumscribe and extend transversely to said terminal portion to provide a barrier to the axial flow of a fluid relative to said terminal portion;
disposing a sleeve around said terminal portion in a spaced relation therewith, said sleeve having a continuous, circumferentially extending side portion bounded by said first and second open end portions, said sleeve providing a barrier to the radial flow of a fluid relative to said terminal portion, said first open end portion of said sleeve being disposed in abutting engagement with said pad, and said side portion being radially spaced from said terminal portion;
casting a liquid potting compound into said sleeve to fill the volume defined by the combination of said pad and said sleeve whereby said terminal portion is covered by said liquid potting compound; and
,curing said liquid potting compound to form a hardened mass surrounding said coil end turn portion.
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Accused Products
Abstract
The terminal portion of a winding end turn conductor which projects from the core member of a dynamoelectric machine is encapsulated in an epoxy potting compound by means of a casting assembly which comprises a detachable conformable pad, a plastic sleeve mold, and a portable vise. The conformable pad is fitted about the terminal portion of the conductor to provide a temporary barrier to axial flow of the epoxy compound during casting. The plastic sleeve is disposed around the terminal portion in a spaced relationship therewith and in an abutting relation with the pad to provide a barrier to the radial flow of the epoxy compound during casting. Clamping means such as a portable vise is fitted about the conformable pad and is tightened to establish a compressive union at the interface of the conformable pad and the terminal portion of the conductor to prevent leakage. A pair of spring members hold the sleeve in abutting engagement with the surface of the conformable pad during the casting process. In a preferred embodiment, a sealing compound is applied to the interface of the pad and the sleeve and also between the pad and the terminal portion of the conductor to prevent leakage. After the epoxy compound has cured, the clamping means and detachable conformable pad are removed from the assembly and can be reused to encapsulate other conductors.
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Citations
6 Claims
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1. A method of encapsulating a terminal portion of a coil end turn conductor which projects from the core of a dynamoelectric machine, said method comprising:
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securing a pad to said terminal portion, said pad having radially extending side portions which circumscribe and extend transversely to said terminal portion to provide a barrier to the axial flow of a fluid relative to said terminal portion; disposing a sleeve around said terminal portion in a spaced relation therewith, said sleeve having a continuous, circumferentially extending side portion bounded by said first and second open end portions, said sleeve providing a barrier to the radial flow of a fluid relative to said terminal portion, said first open end portion of said sleeve being disposed in abutting engagement with said pad, and said side portion being radially spaced from said terminal portion; casting a liquid potting compound into said sleeve to fill the volume defined by the combination of said pad and said sleeve whereby said terminal portion is covered by said liquid potting compound; and
,curing said liquid potting compound to form a hardened mass surrounding said coil end turn portion. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification