| 摘要 |
PURPOSE:To ensure a high density magnetic circuit and a high magnetization efficiency and enable driving with high sensitivity by arranging permanent magnets inside both magnetic poles of a U-shape core wound with a coil, and positioning an armature capable of relay motion with both ends thereof adapted to both magnetic pole parts. CONSTITUTION:A permanent magnet 2 is arranged inside both magnetic pole parts of a U-shape core 1 and an armature 3 giving relay motion is adapted thereto. The armature 3 is attracted by magnetic flux PHI1 generated with one permanent magnet 2 in the non-excited condition of a coil. In the excited condition thereof, magnetic flux PHI0 generated by the core 1 offsets the flux PHI1 and is added to magnetic flux PHI2 generated by the other permanent magnet 2. As a result, the core 1 gives relay motion and turns to a reverse direction. Even when excitation is interrupted, the armature 3 is kept as attracted by the magnetic flux PHI2. |
