Spray coating process for epoxy integral insulation of rotating electrical equipment

The development of one part powdered epoxy resins for spray and fluidized bed use has given the electric motor industry a new approach to ground insulation. Refinements of the epoxy systems to provide high edge coverage, high cut-through resistance, and no post cure makes them even more attractive to the motor manufacturer. The advantages of integral insulation over conventional ground insulation have been well covered in other publications (1, 2) and will not be discussed here. The acceptance of the epoxy integral insulation system by the motor industry has created the need for an easily automated production process that will produce optimum coating results.