| 摘要 |
PURPOSE:To prevent a coil from oxidizing without being cooled down as well as coil winding from being deformed by a method wherein a bobbin containing coil is sealed to be filled with inert gas and then the inner peripheral face of coil is held down by a member with linear expansion coefficient different from that of coil conductor. CONSTITUTION:An outer peripheral cover 15 is welded into the peripheral edge of an upper side plate 3 and a lower side plate 4 to seal a bobbin 1 containing a coil 6 airtightly. Besides, a metallic inner peripheral stay 10 with linear expansion coefficient larger than that of a coil copper conductor is laid between the inner peripheral face of coil 6 and the inner peripheral axial cylinder 2. Then the air inside the bobbin 1 is replaced with inert gas fed from a gas feeding-in pipe 13. Through these procedures,the coil conductor can be prevented from oxidizing without being cooled down by cold water in the case the coil conductor is heated up to high temperature so that the coil 6 may be prevented from being deformed by thermal expansion thereof.
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