| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem in which a conventional coil reduces electromagnetic noise, generated from the coil, by impregnating the coil with vanish or impregnating it with drops, thereby bonding coils, and in the case where such means is used, a transformer of especially large capacity requires a giant facility for vanish impregnation, resulting in an increase in facility cost.SOLUTION: A transformer 1 comprises an iron core 2, a coil 3, and an insulator 60. The coil is wound around a leg part 2a of the iron core. The insulator has a recessed surface 61a with a plurality of recessed parts 61 formed therein. The coils are wound such that the recessed surface is in contact with the outermost wind of the coil. Each recessed part is formed in an approximately hemisphere shape by directly processing the insulator. Such a configuration makes it possible to reduce electromagnetic noise from the coil without increasing the facility cost.</p> |
