Linear motor

A linear motor comprising:

• a magnet plate on which magnets of different polarity are alternately arranged along a movement direction;
• and
• an armature having a core serving as a main body and a coil attached to the core,
• wherein the magnet plate and the armature are made to relatively move along an arrangement direction of the magnets, by way of thrust produced between the magnet plate and the armature,
• wherein the magnet plate has a non-thrust region that extends along an arrangement direction of the magnets, and does not contribute to the thrust, and
• wherein the core of the armature includes a plurality of main teeth to which the coil is attached and an auxiliary tooth provided between the main teeth which are adjacent to each other, wherein the main teeth and auxiliary tooth are not provided in a region opposing the non-thrust region of the magnet plate.