PURPOSE: To make the title-coil small-sized and lightweight by a constitution wherein a magnet which generates, in a magnetic path, a magnetic flux in the direction opposite to that of a magnetic flux formed by a primary coil is provided.
CONSTITUTION: The title coil is provided with the following: two coils 1; central iron cores 2 which are arranged at the inside of the individual coils 1; and a side-face iron core 3 which is arranged at the outside of the respective coils 1 and which is installed in common. A closed magnetic circuit for the respective coils 1 is formed of the central iron cores 2 and the side-face iron core 3. The whole assembly is molded integrally by using a thermoplastic resin 4. The coils 1 which are composed of each primary coil 5 and each secondary coil 6 and high-voltage terminals 8 which have molded metals integrally by using a thermoplastic resin are housed in a thermoplastic resin case 7. A thermoset insulating casting resin is vacuum-injected into the case 7. Thereby, the charge amount of a magnetic flux which is passed through a magnetic substance can be increased up to the sum of the saturation flux density of the magnetic substance and of the magnetic flux density due to a reverse bias of a magnet.
YOSHINARI TAKASHI
WATANABE HIROSHI
| JPS601835A | 1985-01-08 | |||
| JPS55118459A | 1980-09-11 |