Patent ID: 6242825
Filing Date: 2001-06-05
Classification: H02K,Y10T

Abstract:
An electric rotating machine comprising a stator, and a rotor rotatably disposed in said stator through a gap, said stator having windings sheathed outside with a main insulator, whereinsaid main insulator comprises a laminated layer composed of a first insulating layer formed by bonding a thin flake-shaped high dielectric strength insulating material with a thermosetting resin substantially free of a granular filler and a second insulating layer formed by dispersing a fiber insulating material and a high thermal conductive filler in a resin;an initial breakdown voltage V in a thickness direction of the main insulator being a value higher than 20 kV/mm, and a thermal conductivity .lambda. in the thickness direction of said laminated layer being within a range of 0.35 to 1 W/m.multidot.K, and the product V.multidot..lambda. of the initial breakdown voltage and the thermal conductivity satisfying a relationship of 7.ltoreq.V.lambda..ltoreq.20 (MVW/m.sup.2.multidot.K).