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Stator wedge having abrasion-resistant edge and methods of forming same
| Details |
Inventors: Rowe, Charles M.; Coronel, Lorenzo E. Ramirez;
Assignee: Siemens Westinghouse Power Corporation (Orlando, FL)
Primary Examiner: Enad; Elvin
Assistant Examiner: Waks; Joseph
Attorney, Agent or Firm:
A stator wedge (30) to position in a coil slot (40) for retaining coils (40) of a stator of a power generator and methods of forming the wedge (30) are provided. The stator wedge (30) preferably includes an elongate, non-conductive, and substantially rigid body member (36). The body member (36) preferably includes a relatively flat bottom surface (35) and a relatively flat top surface (33). The top surface (33) preferably has less surface area than the bottom surface (35). The body member (36) also includes at least a pair of side peripheries sloping upwardly from peripheries of the bottom surface (35) having a greater surface area to peripheries of the top surface (33) having a lesser surface area to thereby define at least a pair of angled sides (31, 37). A thin-film, abrasion-resistant, non-conductive coating layer (32) is formed on upper surfaces of at least the pair of angled sides (31, 37). |
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DETAILED DESCRIPTION In view of the foregoing, the present invention advantageously provides a stator wedge and methods of forming the same which is relatively easy, less expensive, and takes substantially less time to manufacture.
The present invention also advantageously provides a structurally strong stator wedge and method of installing a stator wedge so that the stator wedge can be driven into position in core laminations to retain stator coils in position within stator coil slots and so that the stator wedge and the installation of the same substantially reduces damage to the stator iron during installation and to the core laminations during operation.
The present invention further advantageously provides a non-conductive stator wedge which has substantially abrasion-resistant and corrosion-resistant surfaces so that the stator lamination are less susceptible to damage from the wedge during operation.
More particularly, the present invention advantageously provides a stator wedge to position in a coil slot for retaining coils of a stator of a power generator.
The stator wedge preferably has an elongate, non-conductive, and substantially rigid body member.
The body member preferably includes a relatively flat bottom surface and a relatively flat top surface.
The top surface has less surface area than the bottom surface.
The body member also includes at least a pair of side peripheries sloping upwardly from peripheries of the bottom surface having a greater surface area to peripheries of the top surface having a lesser surface area to thereby define at least a pair of angled sides.
The body member further includes a thin-film, abrasion-resistant, non-conductive coating layer formed on upper surfaces of at least the pair of angled sides.
The present invention also provides a stator wedging system for a power generator.
The system preferably includes a plurality of core laminations formed of a metal, at least one coil slot formed in the plurality of core laminations, at least a pair of wedge grooves each positioned on an opposing side wall periphery of the coil slot, at least one coil positioned in the coil slot, and a stator wedge positioned in the wedge grooves of the coil slot to retain the coils within the coil slot during operation of the power generator
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Metal Working 
