Electric rotating machine with reduced thickness and volume of insulation
First Claim
1. 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 λ
in the thickness direction of said laminated layer being within a range of 0.35 to 1 W/m·
K, and the product V·
λ
of the initial breakdown voltage and the thermal conductivity satisfying a relationship of 7≦
Vλ
≦
20 (MVW/m2·
K).
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Accused Products
Abstract
An the electric rotating machine which is compact and of reduced cost by improving the thermal conductivity of the main insulation in the thickness direction while maintaining the insulation breakdown voltage of the main insulation high. The initial breakdown voltage V in the thickness direction of the main insulator 30 of the stator winding 3 is higher than 20 kV/mm, and the thermal conductivity λ in the thickness direction is within a range of 0.35 to 1 W/m·K, and the product Vλ of the initial breakdown voltage V and the thermal conductivity λ satisfies a relationship of 7≦Vλ≦20 (MWA/m2·K). The amount of resin is within a range of 20 to 50 weight % of the main insulation material.
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Citations
9 Claims
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1. 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, wherein
said 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 λ
in the thickness direction of said laminated layer being within a range of 0.35 to 1 W/m·
K, and the product V·
λ
of the initial breakdown voltage and the thermal conductivity satisfying a relationship of 7≦
Vλ
≦
20 (MVW/m2·
K).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
Specification