Title:
RING COIL
Document Type and Number:
Japanese Patent JPS54135996
Kind Code:
A
Abstract:
PURPOSE: To operate with safety by means of searching previously the abnormalness of a coil by effecting a non-destructive test on the deformation of the coil by arranging an electrode at the outer frame insulating layer of the coil body.
CONSTITUTION: An electrode layer 7 is arranged at an outer frame insulated layer 6 of a coil body 2, and a coil 1 is formed by means of filling a plug 5 in an outer frame 3. When the coil is deformed during the transportation, the abnormalnes can be detected by means of changing the electrostatic capacity between a terminal 8 of the electrode layer 7 and the outer frame 3.
Inventors:
NAGAI MATAO
KADOTANI KENZOU
SATOU TAKANORI
KADOTANI KENZOU
SATOU TAKANORI
Application Number:
JP4315678A
Publication Date:
October 22, 1979
Filing Date:
April 14, 1978
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H01F5/00; G21B1/00; G21B1/11; H05H1/02; (IPC1-7): G21B1/00; H01F5/00; H05H1/02