| 摘要 |
PURPOSE:To suppress the increase in an eddy current loss between layers by superposing a thin amorphous magnetic strip and a heat resistant insulating film, such as a polyimide film, and winding them to form a wound core, heating it at a predetermined annealing temperature to anneal it, thereby enhancing the insulating resistance between the layers. CONSTITUTION:An amorphous magnetic thin strip 1 of strip shape and a heat resistant insulating film 2, such as a polyimide film having a width equivalent to the width of the strip 1 or more tape width are wound through a guide roller 3 simultaneously to be wound in a sandwich state to form a wound core 4. A temporarily wound coil 5 for applying a magnetic field is wound on the core 4 wound with the strip 1 and the film 2, and the core 4 is contained in a constant temperature oven 6 having an electric heater as a heat source. A DC current flows by a DC power source 7 to heat it by the heater while applying a magnetic field to the core 1 to raise the interior of the tank 6 to the annealing temperature. |
