| 摘要 |
PURPOSE:To increase attracting power without changing greatly an exciting current and structure, by arranging a balance armature facing an iron core wound with an exciting coils, mounting a magnetic body to one end of this armature and mounting a permanent magnet and a magnetic body to the other end of the armature. CONSTITUTION:The balance armature 4 is arranged facing the iron core 2 wound with the exciting coil 1. To one end of this armature 4 a moving iron 5 is mounted, while to the other end a permanent magnet 6 and a piece of magnetic body 7 are mounted. At the time of nonexcitation, because of the magnetic force of the permanent magnet 6 the armature 4 and the taper surface 2D of the iron core 2 are attracted. When a current is flowed to the coil 1, magnetic flux phi1, phi2 are generated so that an attraction takes place between the armature 4 and the taper surface 2c of the iron core 2 creating between the armature 4 and the taper surface 2D of the iron core 2 a magnetic circuit involving the iron core 2, the permanent magnet 6 and the magnetic body 7, which offsets clockwise magnetic flux phi3 of the permanent magnet 6. This facilitates the turn-over of the armature 4, increasing attracting power. |
