| 摘要 |
A bias magnetic flux (10) is formed in such a way as to pass through an electromagnetic core (1) of an electromagnet (20), and furthermore, a bypass magnetic path (9A) constituting a magnetic path for a control magnetic flux (9) is formed in parallel with a permanent magnet (6), with the result that a bypass magnetic path (9A) is magnetized in such a direction as to prevent the passage of the bias magnetic flux (10). Due to this arrangement, even if the permanent magnet (6) and the electromagnet (20) are installed in positions where the magnetic flux of the permanent magnet (6) and that of the electromagnet (20) are mutually superimposed on each other, still the control magnetic flux (9) formed by the electromagnet (20) passes through the bypass magnetic path (9A), thereby permitting the loss of the control magnetic flux (9) to be curbed. By virtue of the above, it is possible to install the permanent magnet (6) and the electromagnet (20) in positions where the magnetic flux of the permanent magnet (6) and that of the electromagnet (20) are mutually superimposed on each other, leading to miniaturization of the pertinent device. |
