| 摘要 |
PURPOSE: Magnet movable electromagnetic actuator is provided to generate steady-state thrust in a short time with satisfactory responsivity without applying large voltage on startup unlike the prior-art electromagnetic solenoid. CONSTITUTION: A first electromagnetic actuator(1A) includes an annular exciting coil(10), an annular main yoke(12) surrounding a periphery of the exciting coil(10) and having at a portion of the main yoke(12) cylindrical polar teeth(12a,12b) positioned to face each other at opposite end portions of a central hole(11) of the exciting coil(10), a cylindrical permanent magnet(13) disposed in the central hole(11) of the exciting coil to be movable in an axial direction of the hole and polarized into the north pole and the south pole in a radial direction, and a cylindrical back yoke(14) inside the permanent magnet(13). The main yoke(12) and the back yoke(14) are respectively made of magnetic material.
|
