| 摘要 |
PURPOSE:To obtain the easy and smooth switch control from demagnetization to excitation of the attraction type magnetic device by using the magnet with small reversible permeability as the permanent magnet rotatably disposed inside of the cavity of the magnetic circuit block. CONSTITUTION:An absorbing magnetic device 10 includes a magnetic circuit block 18 consisting of magnetic members 12, 14 integrally joined each other by the use of a plate-shape non-magnetic member 16 interposed therebetween. Within a cavity 22 formed in the block 18 and having a circular form in cross section, a cylindrical permanent magnet 20 is disposed rotatably. A magnetic acting surface 24 is formed at the under side of the block 18. In this arrangement, magnet materials with small reversible permeability such as ferrite and rare earth metals are used as the permanent magnet 20. |
