Resin-crack prevented high-voltage transformer

Details Resin-crack prevented high-voltage transformer Resin-crack prevented high-voltage transformer

1987-12-03

1989-09-12

Kozma, Thomas J.

Inductor devices

With outer casing or housing

Potted type

336178, 336212, H01F 2702, H01F 2726

Patent

active

048664090

ABSTRACT:
In a high-voltage transformer such as an ignition coil for internal combustion engines, a resin-crack preventing member is provided between an iron core and a resin which is impregnated into a coil case for electrically insulating a primary coil and a secondary coil in the coil case from the iron core as well as for firmly securing these coils and the iron core to the coil case. The resin-crack preventing member is moulded from a resinous material which is highly adhesive to the impregnated resin and which has a coefficient of thermal expansion similar to that of the impregnated resin. The resin-crack preventing member serves to prevent direct contact of the impregnated resin with the corners, side surfaces and inner surface of the iron core which has a coefficient of thermal expansion substantially different from that of the impregnated resin, thereby avoiding peeling off and cracking in the impregnated resin which would otherwise be caused by severe temperature changes. As a result, degradation of the electrical insulation of the transformer is effectively prevented.

REFERENCES:
patent: 2412102 (1946-12-01), Spengler
patent: 4019167 (1977-04-01), Baker
patent: 4199743 (1980-04-01), Martincic
patent: 4516559 (1985-05-01), Oohashi
patent: 4523171 (1985-06-01), Altmann et al.

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