DYNAMOELECTRIC MACHINE WITH IMPROVED SIDE FILLERS FOR COIL RETENTION

摘要

For retention of coils in cores of large dynamo-electric machines, a side filler is used between the insulated coil and the core slot wall with different surface characteristics on each side of the side filler. The surface adjacent the slot wall has a coefficient of friction that is relatively high compared with the coefficient of friction of the surface adjacent the coil. The surface adjacent the slot wall also tends to have a greater degree of adhesion with the slot wall under heat and pressure, than does the surface of the side filler adjacent the coil. These qualities can be provided by employing as the side filler a member having a surface comprising a fluorocarbon polymer adjacent the coil while the other surface includes a different, more conventional, resinous material. The combination of the invention permits free movement of the coil during thermal cycling without tending to remove the side filler from the slot and without damaging the coil insulation.