Abstract: A high permeability slot wedge for a dynamoelectric machine with the wedge configured as an elongated bar of uniform cross-sectional configuration formed of a ferromagnetic material having modestly good electrically insulative properties comprising approximately by weight 60% to 80% relatively small ferromagnetic particles such as powdered iron, about 10% reinforcing glass fabric; and 15% to 20% unsaturated thermosetting plastic resin binder such as a polyester resin is disclosed. The ferromagnetic material is homogeneously distributed throughout the thermosetting plastic binder so that the permeability and resistivity of the resulting wedge is substantially uniform throughout.

Abstract: A high permeability slot wedge for a dynamoelectric machine with the wedge configured as an elongated bar of uniform cross-sectional configuration formed of a ferromagnetic material having modestly good electrically insulative properties comprising approximately by weight 60% to 80% relatively small ferromagnetic particles such as powdered iron, about 10% reinforcing glass fabric; and 15% to 20% unsaturated thermosetting plastic resin binder such as a polyester resin is disclosed. The ferromagnetic material is homogeneously distributed throughout the thermosetting plastic binder so that the permeability and resistivity of the resulting wedge is substantially uniform throughout.

Abstract: A dovetail wedge for retaining conductor bars in stator slots of a large dynamoelectric machine includes an embedding surface layer on surfaces thereof which contact the lamination surfaces in dovetail slots of the stator. The embedding surface layer permits the embossing thereof by irregularities of the surface of the laminations. A range of thicknesses for the embedding layer provides sufficient protection against abrasion and a sufficient lubricity during wedge installation without being so thick that long-term dimensional instability may permit loosening of the conductor bars. The embedding layer is preferably a natural fiber and most preferably a woven or non-woven cotton fiber.

Abstract: A styrene-acrylonitrile composition having reinforcing glass fibers, a brominated flame-retarding additive, and polytetrafluorethylene in amounts sufficient to prevent dripping of the composition at flaming combustion conditions.