Abstract: Housing frames for use in electromechanical machines may be advantageously produced using a novel pattern form in a lost foam casting process. The pattern form is made from a cast dissolvable material, and is configured to permit easy modification prior to casting. The pattern form may be adapted to produce footed or footless housing frames, or housing frames of various axial lengths. In addition, the frame area on which a conduit box will be attached can be easily modified prior to casting. After the pattern form has been modified, it is placed in a casting medium of dry particulate material, such as sand. Upon contact with molten metal, the pattern form vaporizes. The molten metal fills the space where the pattern form had been, assuming the desired shape. After the molten metal has cooled to rigidity, the resulting housing frame can be removed from the casting medium.

Abstract: Bearing assemblies supporting the shaft of an electrical rotating machine are electrically insulated from the bearing housing. For each bearing assembly, a portion of the housing defines a receptacle into which an insertion ring is positioned. The gap between the insertion ring is filled with an appropriate insulative material, such as a nonconductive binding compound or an insulative polymer. In a preferred construction, nonconductive binding compound is located between spacers of insulative polymer. In another preferred construction, a nonconductive coating is applied to the outer surface and the remainder of the gap is filled with nonconductive binding compound. Insulative polymeric material may be used without binding compound in some embodiments. The bearing assembly is maintained in the insertion ring.

Abstract: Bearing assemblies supporting the shaft of an electrical rotating machine are electrically insulated from the bearing housing. For each bearing assembly, a portion of the housing defines a receptacle into which an insertion ring is positioned. The gap between the insertion ring is filled with an appropriate insulative material, such as a nonconductive binding compound or an insulative polymer. In a preferred construction, nonconductive binding compound is located between spacers of insulative polymer. In another preferred construction, a nonconductive coating is applied to the outer surface and the remainder of the gap is filled with nonconductive binding compound. Insulative polymeric material may be used without binding compound in some embodiments. The bearing assembly is maintained in the insertion ring.