| 摘要 |
PURPOSE:To decrease the reluctance of a gap in the axial direction and a gap in the radial direction and increase sucking force and rotatory torque by a method wherein a magnetic fluid having excellent permeability is confined into the gaps in the solenoid using the magnetic fluid. CONSTITUTION:Magnetic, one kind of ferrite, is pulverized into minute particles with diameters of about 100Angstrom , and dispersed in a solvent, base oil, by the aid of a surface active agent. Since a magnetic fluid having large permeability is filled in the gap 10 in the axial direction and the gap 14 in the radial direction, the reluctance of the gaps 10, 14 is decreased, and sucking force is increased. |
