| 摘要 |
PURPOSE:To eliminate deterioration of insulation resistance under water by providing the combined insulation layer made of a waterproof insulation layer and an impervious layer to water. CONSTITUTION:A coil conductor 1 is wrapped up with an impervious layer 2 of water tree such as epoxy resin and a waterproof insulation layer 3 such as polyethylene is applied on an impervious insulation layer 3 to water. A waterproof insulation layer 3 can be replaced by polypropylene or tetrachloroethylene, etc. being inclucive with polyethylene and an impervious insulation layer 2 to water can be replaced bisphenol A epoxy resin or other setting resin of various kind or compounded insulation with inorganic material such as mica or glass. |
