| 摘要 |
PURPOSE:To increase the shock resistance of a movable iron core and to reduce the effect of a diamagnetic field by applying pulse D.C. voltage which magnetizes a fixed iron core enabling reversal of positive or negative polarity, by providing an electromagnetic coil for reciprocating a movable iron core and by covering the movable iron core with a protection tube. CONSTITUTION:When an electromagnetic coil 10 is magnetized by applying positive magnetic field pulse D.C. voltage, a positive magnetic field is generated in a fixed iron core 11 and a movable iron core 12 is attracted to the fixed iron core 11. In this state, if diamagnetic D.C. voltage is applied to the electromagnetic coil 10, a diamagnetic field is generated in the fixed iron core 11, the movable iron core 12 is returned by repulsion and is reciprocated by the inversion of the magnetism of the D.C. voltage applied to the electromagnetic coil 10. Since the movable iron core 12 is protected by a protection tube 13, the movable iron core 12 made of a permanent magnet which has low shock resistance is neither cracked nor broken off. |
