Patent ID: 8970334
Filing Date: 2015-03-03
Classification: H01F

Abstract:
1. A magnetic substance holding device that controls permanent magnet energy, the device comprising: an N pole piece formed of a magnetic substance, wherein the N pole piece has a holding face to which a target formed of a magnetic substance is attached and a base attachment face at a side different from the holding face; an S pole piece formed of a magnetic substance, wherein the S pole piece has a holding face to which the target is attached and a base attachment face at a side different from the holding face; a permanent magnet that is disposed such that the N pole thereof comes in contact with the N pole piece and the S-pole thereof comes in contact with the S pole piece; a coil that is wound around at least one of the N pole piece and the S pole piece; a base that is movable between a first position at which the base does not come in contact with both of the base attachment face of the N pole piece and the base attachment face of the S pole piece and a second position at which the base comes in contact with both of the base attachment face of the N pole piece and the base attachment face of the S pole piece; and a control device that controls a current applied to the coil, wherein the target is held or released by applying a current to the coil through the control device such that at least one of the N pole piece and the S pole piece is magnetized, when the base is disposed at the first position, the target is attached to the holding faces of the N pole piece and the S pole piece, and the target is released from the holding faces of the N pole piece and the S pole piece by applying a current to the coil to generate a magnetic flow through the base attachment face of the N pole piece and the base attachment face of the S pole piece and by moving the base to the second position by a magnetic force.