Patent ID: 6946755

Claim:
A linear motor having a field yoke in which a plurality of permanent magnets with alternately different magnetic poles are disposed along the field yoke, an armature parallelly facing a magnet array of the permanent magnets with magnetic air gap between the armature and the magnet array, and a frame that fixes the armature and has a heat sink, wherein: the permanent magnets and the field yoke that constitute the field poles are arranged in two-line form, the armature is disposed between the two-line filed poles and consists of at least two rows of armature coils formed by tabularly arranging a plurality of coil groups in longitudinal direction thereof, a tabular heat pipe is disposed between the plurality of coil rows along a longitudinal direction of the armature and is bonded with a resin mold so as to cover the coil rows, and the field poles and the armature are relatively run while using one of the filed poles and the armature as a stator and using the other one as a rotor, wherein: a part of a heat absorbing part of the heat pipe is fixed to the armature coil, whereas a heat radiating part thereof is inserted in an interior of the heat sink.