| 摘要 |
<p>AN ELECTROMAGNET WITH A MOVING SYSTEM AND PERMANENT MAGNET, ESPECIALLY FOR CONTACTORS A moving system constituted by a permanent magnet and pole-pieces is accurately guided in axial translational motion within the coil unit of an electromagnet and enclosed within a coil form member, the axis of magnetization being perpendicular to the axis of the coil unit. Air-gap zones are located at both ends of the coil unit and a stationary yoke surrounds the two ends of the coil. Flat portions of the yoke which are parallel to the axis of magnetization each penetrate respectively into one air-gap zone so as to ensure that, at least in one stable position of the moving system, a flat portion of the yoke is in contact with one of the pole-pieces whilst the other flat portion is in contact with the other pole-piece. Better magnetic coupling between the coil, the air-gaps and the permanent magnet as well as higher operating efficiency are achieved.</p> |
