Generator rotor and method for eliminating keyway stress cracks

Details Generator rotor and method for eliminating keyway stress cracks Generator rotor and method for eliminating keyway stress cracks

1997-10-20

1999-03-16

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310271, 29598, H02K 1514

Patent

active

058834567

ABSTRACT:
A method for repairing stress-induced cracks in a generator rotor keyway is disclosed. The method comprises disassembling the retaining ring and ring key from the rotor, and machining away the crack and surrounding rotor metal from the rotor keyway. The machining step may be performed in a lathe or milling machine. This method diminishes the labor cost, equipment cost, and down time required for crack repairs because the slot contents may remain in the slots during the entire repair process. A spacer ring and an enlarged key that may be inserted into the machined, enlarged keyway are also disclosed.

REFERENCES:
patent: 4633554 (1987-01-01), Clark et al.
patent: 4893388 (1990-01-01), Amos et al.
patent: 5085363 (1992-02-01), Sims
patent: 5174011 (1992-12-01), Weigelt
patent: 5528097 (1996-06-01), Gardner et al.

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