Fluidized-bed application of epoxy resin insulation to rotating electrical machinery

For some time, the manufacturers of electrical motors have searched for an integral insulation system to replace paper slot inserts and fiber end laminations. By way of illustration, there have been many attempts to design a suitable insulation of this type. Some of the more notable methods tried have been resinous thixotropic dip compounds, molded inserts of organic materials, spraying, and elaborate methods of applying thixotropic pastes by a knife coating means. With the advent of the fluidized-bed process and specially formulated epoxy resin powders, the electric motor manufacturers now have a productive method and excellent insulating materials for applying integral insulation.