Generator rotor fretting fatigue crack repair

Electrical generator or motor structure – Dynamoelectric – Rotary

Reexamination Certificate

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Details

C310S261100, C029S402060, C029S598000

Reexamination Certificate

active

06849972

ABSTRACT:
A method of repairing a crack in at least one side of a dovetail portion of a generator rotor coil slot wall, the dovetail portion having received at least two axially adjacent steel wedges and including at least a radial entry surface, an inwardly tapered surface and an intermediate radial surface, the method comprising a) machining a groove at least partly along the inwardly tapered surface to remove damaged material from the coil slot wall; and b) replacing the at least two axially adjacent steel wedges.

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“Fretting Fatigue Analysis of Strength Improvement Models with Grooving or Knurling on a Contact Surface,” Hattori et al.,Standardization of Fretting Fatigue Test Methods and Equipment,1992, pp. 101-114.
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