| 摘要 |
PURPOSE:To suppress the rise in temperature of the corner parts of an iron core by a method wherein a magnetic material is provided between the layers of thin plates located at the corner parts of the iron core consisting of amorphous magnetic alloy thin plates, and an annealing is performed using the heat generated by the iron core itself. CONSTITUTION:The sheet-like insulating materials 13, having the width almost the same as that of the amorphous magnetic alloy thin plates 12, are inserted between the layers of the thin plates 12 every time the amorphous magnetic alloy thin plate 12 is wound by the prescribed number of turns. When an annealing is performed on the wound core 11 for the purpose of removing a distortion, a high frequency AC current is applied to an excitation coil 14. An eddy current runs on the thin plates 12, and the temperature of the thin plates goes up. As a result, an annealing is performed by raising the temperature of the entire wound core 11 to the suitable annealing temperature with a uniform temperature distribution, thereby enabling to restore the intrinsic excellent magnetic characteristics of the amorphous magnetic alloy thin plates 12. |
