| 摘要 |
<p>PURPOSE:To save electric power and solve the problem of heat generation by using a self-holding type solenoid which is only fed with an instantaneous current at head loading, i.e. at attraction and return and requires no holding current. CONSTITUTION:The solenoid has a compression coiled spring 10 which generates restoring force and a permanent magnet 5 at the front part. A figure (a) shows a state before an attracting coil 1 is conducted. When the gap 13 between a movable iron core 3 and a fixed receptacle 9 is set larger than the gap 12 between the movable iron core 3 and a yoke 7, almost no attracting force is generated at the gap 13 by the magnetic force of the permanent magnet 5. A figure (b) shows an conductive state and the magnetic flux by the coil 1 is opposite to the magnetic flux of the permanent magnet 5 at the gap 12, so that all pieces of magnetic flux are attracted by the fixed receptacle 9. A figure (c) shows the nonconductive state of the coil 1 after the movable iron core 3 is attracted to the fixed receptacle 9 and the gap 13 at this time is zero, so the movable iron core 3 and fixed receptacle 9 are attracted continuously by the magnetic flux of the permanent magnet 5. A figure (d) shows a state when the conductive direction is made opposite, and the iron cre returns to its original position by the compressed coiled spring 10.</p> |
