Abstract: A brush wear indicator contact and terminal assembly having a high pressure-per-unit contactor that is formed on a first surface of the plate. A conductor for a brush wear indicator circuit is bonded to the contact plate by a high temperature resistant solder or brazing material and the contact plate is bonded to the surface of the dielectric sheet, which electrically isolates the contact from the spring when the spring is in an extended condition. By the method of the invention, a brush wear indicator contact and terminal assembly is made by adhering a sheet of dielectric material to a brush follower spring with a coating of permanently flexible adhesive, and by bonding a conductor for a brush wear indicator circuit to a contact plate having a contactor ridge on one opposite surface thereof.

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: An interface circuit for use between a plurality of sensors, such as brush wear detecting sensors, and a single indicating alarm. The interface circuit is operable to transmit a signal from any or all of the sensors to actuate the alarm and latch it in its operative state until the alarm is de-energized by an operator.