Hitachi, Ltd.

Hirofumi Kubo

Toshiyuki Fujimori

Shigeo Hosaka

Tomomi Izuna

Yasuyuki Takahara

A transformer having a molded coil which can stably sustain an electric-shock free function for a long period of time. The transformer has a grounded conductive shield layer on the surface of the molded coil. The shield layer is composed of a plurality of segments so that a stable bonding of the shield layer to resin is kept for a long period of time, with the respective segments being grounded by a conductor.

Transformer with a surface shield layer

An economical and light-weight molded coil structure wherein sheet-form electrical insulator layers containing a thermosetting resin are wrapped around the inner and outer peripheries of a coil to function as a casting mold, and end-enclosing resin layers are applied to the both end faces respectively of the coil not covered with the sheet-form insulator layers. A gas is charged to be sealed in the coil.

Growing community of inventors

Niigata, Japan

Hirofumi Kubo