Patent ID: 7906876

Claim:
A linear synchronous motor comprising: a mover including: a direct drive shaft reciprocating in an axial direction, and one or more arrays of permanent magnets mounted on the direct drive shaft; and a stator including: a plurality of windings disposed at a predetermined interval in the axial direction to enclose the direct drive shaft, and a stator core unit including: a plurality of magnetic pole portions disposed to enclose the direct drive shaft concentrically with the direct drive shaft and also disposed at a predetermined interval in the axial direction to define a space to allow one winding to be interposed between two adjacent magnetic pole portions, and a yoke magnetically connecting the magnetic pole portions; a majority or all of the magnetic pole portions being formed of magnetic steel plates of a predetermined shape that are laminated in the axial direction, the magnetic pole portions each having one or more connected portions, the connected portions of magnetic pole portions being disposed along the direct drive shaft to form one or more connected portion arrays; and the yoke being constituted from one or more yoke assemblies formed of a magnetic conductive material, the one or more yoke assemblies mechanically and magnetically connecting the connected portions of the one or more connected portion arrays.