ELECTROMAGNETIC DRIVER USING SOFT MAGNETIC MATERIAL HIGH IN MAGNETIC PERMEABILITY AND SATURATION FLUX DENSITY

摘要

PROBLEM TO BE SOLVED: To provide an electromagnetic driver, capable of being not only being reduced in size, facilitating in high thrust but also being improved in a linear movement properties in driving.;SOLUTION: A yoke 12, formed of a soft magnetic material high in magnetic permeability and saturation flux density, is arranged in a plastic box 11. The yoke 12 is formed with a through-hole at the center. The shape of the yoke 12 is 30mmψ in diameter, 3mm in external wall thickness, 5mm in bottom face thickness, 10mm in internal hollow cylinder diameter, 5mm in through-hole diameter at the hollow part, and 50mm in length. When a current is fed to a coil 14 of the electromagnetic driver, the current in the coil 14 receives a force from a magnetic field in a magnetic circuit formed of the yoke 12 and a permanent magnet 13. The force received by the current is the vertical directions in the figure. When the coil 14 receives the force, a moving body 15, fixedly connected to the coil 14 and a connecting piece 17, move as a single body. At this time, the thrust of the movement is the force that the coil 14 receives from the magnetic field, and a reaction force is a force from a damper 16.;COPYRIGHT: (C)2004,JPO