Abstract: An insulated field pole coil assembly for a dynamoelectric machine characterized by including an open-weave glass tape wound in half-lapped fashion around the energizing coil of magnet wire on the pole and coated with a continuous, void-free, crack-resistant dipping compound that is supported by the strands of the tape. In the method of the invention a coil is wound with lapped open-weave tape and immersed in dipping compound which is supported by the tape strands while the compound is cured, and thereafter, to form a crack-resistant, continuous insulating coating around the coil.

Abstract: A dynamoelectric machine pole and coil assembly having a magnetic pole member around which a preformed coil of insulated magnet wire is mounted. The assembly is characterized by including a plurality of preformed, extended corner sheets of insulating material that are positioned to extend around and beyond each of the corners of the magnetic pole member into overlapping relationship with adjacent extended corner sheets. The extended corner sheets are bonded to the pole member and to one another at their overlapped ends. Projecting tip portions on the magnetic pole member have their upper surfaces completely shielded from the energizing coil by lip parts of the extended corner insulating sheets. A felt piece impregnated with thermosetting resin is used to make a readily conformable corner section of the lip part.

Abstract: A dynamoelectric machine pole and coil assembly having a magnetic pole member around which a preformed coil of insulated magnet wire is mounted. The assembly is characterized by including a plurality of preformed, extended corner sheets of insulating material that are positioned to extend around and beyond each of the corners of the magnetic pole member into overlapping relationship with adjacent extended corner sheets. The extended corner sheets are bonded to the pole member and to one another at their overlapped ends. Projecting tip portions on the magnetic pole member have their upper surfaces completely shielded from the energizing coil by lip parts of the extended corner insulating sheets. A felt piece impregnated with thermosetting resin is used to make a readily conformable corner section of the lip part. The cured piece is free of voids, so reinforces the insulation of the ground barrier of the assembly at the critical corner areas.