| 摘要 |
<p>PURPOSE:To make it possible to use one permanent magnet in a simple constitution, to reduce magnetic resistance and to prevent the effects of other factors on the size of the permanent magnet by positioning the permanent magnet between a first planar part and second planar part. CONSTITUTION:At the time of no excitation, either a set of pole pieces 5 and 9 or a set of pole pieces 6 and 8 is brought into contact with a set of pole surfaces 1a and 2b or a set of pole surfaces 1b and 2a by the rotation around a shaft 14. At this time a current is conducted through a coil 4 in the opposite direction of magnetic flux which is made to flow through a yoke 3 by a permanent magnet 12, and the coil is excited. Thus, a repelling force is generated in the set wherein the pole pieces and the pole surfaces are in contact, and an attracting force is generated in the set wherein they are separated. Therefore, a first armature piece 11a and a second armature piece 11b are turned, and the separate pair is attracted. When the current is conducted through the coil in the reverse direction, the armatures are turned in the reverse direction and returned to the original positions. Since the permanent magnet 12 is positioned between a first planer part 7 and a second planar part 10, the size of the permanent magnet is a not affected by other factors.</p> |
