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The arc damage on the core lamination surfaces was not visible until after core was unstacked.

Stator Core Damage

Problem: Stator-core looseness can occur over time as pre-tensioned through bolts relax. A loose core is conducive to coil and lamination damage. If laminations vibrate relative to one another, they can wear surface insulation. Such wear leads to shorts, core hot spots, and eventually, core-to-core or coil-to-core failure. Photo on this page shows arc damage on lamination surfaces that was not visible until after the core was unstacked.