Polymer Composites for Generators and Motors

The insulation material of high voltage motors and generators is a polymer composite which is composed of mica, which is inorganic silica (SiO 2 ), and organic polymer materials. In this section, concept of the electrical insulation design of the machines is introduced and the importance of partial discharge endurance is explained. Then, historical basic research on nano-composite materials is reviewed in terms of partial discharge characteristics. Finally, recent progress in the development of nano-composite application to high voltage generators is described. As another topic of polymer composite in generators and motors, stress grading system for coil end termination is briefly mentioned.