Kapton polyimide film in rotating machinery

Several important motor manufacturers report Kapton polyimide film offers major design advantages, especially in large formed-coil machines, traction motors and precision rotating equipment where a tough, thin, high temperature resistant, high dieledric insulation is required. A heat-sealable modification, Kapton Type HF, provides a moisture and dust harrier as well as arc and track resistance. The functionality of Kapton permits larger copper conductors in armature slots, resulting in increased horsepower without corresponding increases in frame size. Faster heat dissipation allows cool operation or further upgrading in horsepower, whichever is desired. Coils can be wrapped easily before bending, resulting in production cost savings. Field performance data have been accumulated to illustrate these insulation systems advantages.