| 摘要 |
PURPOSE:To form a composite magnetic core possessing magnetic permeability characteristics having non-linear characteristics to a DC superposition magnetic field by a method wherein specified amorphous alloy ribbons are combined with each other to obtain a core main body and thereafter, the main body is heat-treated to form the composite magnetic core. CONSTITUTION:A first ribbon 1a is used as a Co amorphous magnetic alloy ribbon and a second ribbon 1b is used as an Fe amorphous magnetic alloy ribbon. The second ribbon 1b is fed out from a second roll 3b and a Capton tape piece 10 is adhered on the tip of the ribbon 1b so that an adhesive surface is positioned on the tip. The ribbon 1b is wound on the periphery of a wound core 6 and the wound core is rotated only a little over one rotation and is fixed annularly. Then, the starting end of the ribbon 1a from a first roll 3a is inserted in the core 6 while the ribbon 1b is wound on the core 6 and after the ribbons 1a and 1b are alternately wound on the core 6 and a lap winding part is formed, the first ribbon is cut to wind the second ribbon 1b only and a magnetic core main body 12 is obtained. This main body is heat-treated to obtain a composite magnetic core. Thereby, a magnetic core possessing L type characteristics, wherein the magnetic permeability scarcely varies in a current range between some point and a core saturating point, can be formed. |
