JPS6457603A - Electromagnetic device - Google Patents

Abstract

PURPOSE:To obtain an electromagnet which has its sensitivity not adversely affected and has an improved attraction force, by combining an armature block and a coil block respectively consisting of a specific construction in a specific manner, thereby preventing the magnetomotive flux of the coil from passing through the permanent magnet. CONSTITUTION:There are provided a coil block 9 having on both sides two magnetic pole section groups comprised of central magnetic pole sections 7b, 7c and opposing magnetic pole sections 7a, 7b sandwiching the central magnetic pole sections 7b, 7c and excited by a coil 3, and an armature block 6 having armatures 6a, 6b connected by a non-magnetic piece 17 so that the magnetizing direction of a permanent magnet 5 is reversed, said armatures 6a, 6b being comprised of two parallel magnetic pieces 4a, 4b having their same sides connected via the permanent magnet 5. And, the armature block 6 and the coil block 9 are combined so that the other ends of the respective magnetic pieces 4a, 4b of both armatures 6a, 6b are respectively inserted into the two gaps created by the central pole sections 7b, 7c and the opposing magnetic pole sections 7a, 7d of each magnetic pole section group, whereby the armature block 6 is driven by excitation of the coil 3.