METHOD AND DEVICE FOR NONDESTRUCTIVE INSULATION TESTING OF SMALL-SIZED ELECTRIC MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for insulation testing, which make it possible to inspect all defect parts where sounding winging coils are abnormally close to laminate coarse (at intervals of <1 mm) through nondestructive inspection in a mass-production process. SOLUTION: This nondestructive insulation testing method comprises a step of a pressure-reduced atmosphere being formed in a vessel which contains a small-sized electronic machine, and a high-frequency voltage is applied to a coil that the small-sized electronic machine has and a step where it is detected whether the small-sized electric machine is causing corona discharge.