The stator coil of a rotary electric machine

Insulation reliable, and to realize the stator coil of the low-loss capable rotary electric machine. Low-resistance shield 1 resistance composed mainly of carbon element small dielectric constant that is attached to the conductor 5 is composed of a large material. The upper layer of the low resistance shield 1, constituted by a discharge shielding 2 containing SiC, sandwich the two layered material 3,4 between the low-resistance shield 1 and the discharge shield 2. Layered material 3 layered material 4 composed of C and The size order of the dielectric constant of each layer and the conductivity, low resistance shield 1> layered material 3> layered material 4> discharge shield 2, and the maximum electric field becomes smaller. The material of the adjacent layer can be approximated to the coefficient of linear expansion of each other contain identical components, peeling at the interface is suppressed. It is possible to reduce the electric field in the wide range of high frequencies from DC to the permittivity and conductivity together by tilting.