| 摘要 |
PURPOSE:To remove local overheat by preventing the tank wall of an induction electric apparatus from invasion of leakage magnetic flux into the neighborhood of a pocket hole, and to attain effectively magnetic shielding by a method wherein at respective magnetically shielding plates, unit magnetically shielding plates of the plural number of pieces are shifted in the lateral direction inserting insulating plates to the parts facing to the respective magnetically shielding plates to form step parts. CONSTITUTION:Because magnetically shielding plates 111, 112 have permeability far higher than the wall of a tank 3, and moreover the magnetically shielding plates are connected magnetically mutually in the arrangement direction, even when the shielding plates are discontinued at the part of a pocket hole 5, the wall of the tank 3 is prevented from invasion of leakage magnetic flux, and flux passes the connected magnetically shielding plates to flow as shown with arrow marks. Accordingly, no leakage magnetic flux invades in the wall of the tank 3, generation of eddy current loss is removed, and no fear of local overheat is generated completely. Moreover, by inserting insulating plates 14, the magnetically shielding plates are protected, and the adjoining magnetically shielding plates are prevented surely from generation of mutual electric short-circuiting. |
