Patent ID: 8884473

Claim:
An armature of a linear motor through which a plate-like mover is passed, comprising: a first subunit made of a soft magnetic material and having an opening portion through which the mover passes, a yoke portion disposed outside the opening portion, and a core portion extending from the yoke portion on one side in a thickness direction of the mover; a second subunit made of the soft magnetic material and having an opening portion through which the mover passes, a yoke portion disposed outside the opening portion, an auxiliary core portion extending from the yoke portion on one side in the thickness direction of the mover, and a core portion extending from the yoke portion on the other side in the thickness direction of the mover; a third subunit made of the soft magnetic material and having an opening portion through which the mover passes, a yoke portion disposed outside the opening portion, a core portion extending from the yoke portion on one side in the thickness direction of the mover, and an auxiliary core portion extending from the yoke portion on the other side in the thickness direction of the mover; a fourth subunit made of the soft magnetic material and having an opening portion through which the mover passes, a yoke portion disposed outside the opening portion, and a core portion extending from the yoke portion on the other side in the thickness direction of the mover; the first subunit, the second subunit, the third subunit and the fourth subunit being stacked in this order; a spacer unit made of the soft magnetic material and having an opening portion through which the mover passes, a yoke portion disposed outside the opening portion, and an auxiliary core portion extending from the yoke portion on either side in the thickness direction of the mover; the spacer unit provided between the first subunit and the second subunit, between the second subunit and the third subunit, and between the third subunit and the fourth subunit; a first winding collectively wound around the core portion of the first subunit, the auxiliary core portion of the second subunit, the core portion of the third subunit, and the auxiliary core portion on one side in the thickness direction of the mover of the spacer unit; and a second winding collectively wound around the core portion of the second subunit, the auxiliary core portion of the third subunit, the core portion of the fourth subunit, and the auxiliary core portion on the other side in the thickness direction of the mover of the spacer unit.