Patent ID: 8384252

Claim:
A linear motor comprising: a field system in which a plurality of permanent magnets are linearly arranged on a field yoke so that the polarities thereof are alternated; and an armature configured to face said field system with a magnetic air gap therebetween and to have an armature core provided with armature windings, said linear motor running along a predetermined direction of travel with either said field system or said armature serving as a mover and the other serving as a stator, wherein: said armature core comprises: auxiliary teeth that are respectively provided on both ends along said direction of travel and around which said armature windings are not wound; and a plurality of main teeth that are provided between said auxiliary teeth of said both ends and around which said armature windings are respectively wound, and each of said auxiliary teeth comprises a lower surface having an end portion shape in which a dimension in a teeth height direction orthogonal to said direction of travel is variable along said direction of travel, wherein the lower surface faces the magnetic air gap, and wherein the end portion shape of the lower surface is stepped shape, or a curved shape including a concave portion.