| 摘要 |
<p>A polarized electromagnetic relay is composed of a yoke section having air gaps at four diagonal positions and an H-shaped armature block (7) having four armature portions which are positioned in the air gaps of the yoke section, respectively, and are arranged to enable a parallel movement. The yoke section is composed of two yoke units, each of which is composed of a first pole piece (1) approximately U-shaped, a permanent magnet (6) having the one pole positoned over the center of the lower surface of the first pole piece, and a second pole piece (5) which contacts the other pole of the permanent magnet (6) and forms air gaps between both ends thereof and both free ends of the first pole piece (1), respectively. In the polarized electromagnetic relay of the invention, the armature block is a lightweight moving element because it contains no permanent magnet and the magnetic flux path in the electromagnetic coil includes no permanent magnet with resultant high magnetic efficiency, so that the operational speed is high, the sensitivity is good and the mechanism operates with less impact.</p> |
