| 摘要 |
PROBLEM TO BE SOLVED: To provide a demagnetizing method and a demagnetizing device used for it, where the moveming of the device is made easy for removing a residual magnetism occurring at a building structure, while action is done in a short time using a normal power source. SOLUTION: A DC power source 2 with a capacitor is connected in series with a current circuit 3, to a demagnetizing coil 1 arranged on a surface 6 of a building structure where a residual magnetism is generated, which provides delay effect of the damped oscillation current of a resonance circuit specified by the capacity of a capacitor for a DC power source, the resistance of a demagnetizing coil, and inductance to limit a damping factor. The damped oscillation current generates an oscillation magnetic field 5, which acts on residual magnetism 8 of the building structure for demagnetization at the demagnetizing coil, and the demagnetizing coil is arranged according to the position of residual magnetism, for demagnetization in a short time with a normal power source, regardless of the polarity of residual magnetism. |
