| BACK || FORWARD |

Extensive stator and core damage resulting from loose wedge
The failure of one wedge can lead to the total loss of the stator and rotor windings, and even the core.

holes in wedge used to check tightness
Typical stator wedge with gauge holes (top, circled) and side ripple spring (bottom)

Stator Wedge Looseness & Failure

Problem: Wedges are essential for holding stator coils tight in their slots. They also help minimize vibration from steady-state related excitation forces. When wedges loosen, coils vibrate, wearing into the ground-wall and turn insulation. Such wear leads to ground failure or turn-to-turn shorts. Should a wedge become completely dislodged, damage to both the winding and core can be extensive as shown in the photo at the top left.