Powder coating for generator stator bar end fitting and method for applying the power coating
First Claim
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1. A method of sealing the junction of a generator stator bar end and a stator bar end fitting receiving the bar, comprising:
- attaching the fitting to the end of the stator bar with a braze material;
applying a powder coating material at least to the end of the stator bar attached to the fitting, through a chamber in the fitting; and
curing the powder coating material to form a barrier coating on the end of the stator bar and the adjoining interior surfaces of the fitting.
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Abstract
A method of sealing a generator stator bar and a stator bar end fitting receiving the end including the steps of: brazing the fitting to the end of the stator bar with a braze material; applying a powder coating material to the end of the stator bar in the fitting; and curing the powder coating material to form a barrier coating on the end of the stator bar and the adjoining interior surfaces of the fitting.
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Citations
20 Claims
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1. A method of sealing the junction of a generator stator bar end and a stator bar end fitting receiving the bar, comprising:
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attaching the fitting to the end of the stator bar with a braze material;
applying a powder coating material at least to the end of the stator bar attached to the fitting, through a chamber in the fitting; and
curing the powder coating material to form a barrier coating on the end of the stator bar and the adjoining interior surfaces of the fitting. - View Dependent Claims (2, 3, 4, 5)
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6. A method of sealing a stator bar end to a stator bar clip, the clip having a chamber for receiving a liquid through an opening and in communication with hollow strands in said stator bar to enable coolant liquid flow through the hollow strands, said method comprising:
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brazing the clip to the end of the stator bar;
electrostatically charging a powder coating material and spraying said powder coating material into said chamber; and
curing the powder coating material to form a barrier over the end of the stator bar in the fitting. - View Dependent Claims (7, 8, 9)
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- 10. An assembly comprising a stator bar end and a fitting receiving the end to define a seal substantially impermeable to liquid, the fitting having a chamber for receiving a liquid through an opening in the fitting and in communication with hollow strands forming at least a portion of said stator bar and for flow of the liquid through the hollow strands, wherein at least a portion of an interior surface of said chamber has a polymer layer powder coated and cured on a surface thereof.
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15. A fitting for a stator bar of a generator comprising:
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a fitting housing having a collar at a first end and a cooling fluid coupling at an opposite end, wherein said collar is configured to be brazed to an end of the stator bar;
a chamber extending from the first end to the opposite end of the fitting; and
a polymer coating on an end of the stator bar in said chamber and forming a seal between the end and a remaining portion of the chamber. - View Dependent Claims (16, 17, 18, 19)
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20. A method of coating the interior of a stator bar clip including the steps of electrically grounding the stator bar clip, spraying an electrostatically charged powder into the stator bar clip to form a layer of the powder thereon to a predetermined thickness and curing the powder spray-coated on the stator bar clip to form a substantially continuous corrosion barrier layer on an exposed interior surface thereof.
Specification