Patent ID: 8536742

Claim:
A linear synchronous motor comprising: a mover including: first and second direct drive shafts configured to reciprocate in an axial direction; and first and second arrays of permanent magnets respectively mounted on the first and second direct drive shafts, the first array of permanent magnets and the second array of permanent magnets being disposed to be shifted from each other by an electrical angle of 180°; and a stator including: a first array of windings disposed at predetermined intervals in the axial direction to surround the first direct drive shaft, and a second array of windings disposed at predetermined intervals in the axial direction to surround the second direct drive shaft, the first and second arrays of windings being excited with the first and second arrays of windings being shifted by an electrical angle of 180°; and a stator core unit including: an array of divided cores each integrally including a first magnetic pole portion disposed to surround the first direct drive shaft concentrically with the first direct drive shaft and a second magnetic pole portion disposed to surround the second direct drive shaft concentrically with the second direct drive shaft, the divided cores being disposed at intervals in the axial direction such that two adjacent divided cores define a space therebetween where one winding of the first array of windings and one winding of the second array of windings are disposed, the divided cores each including at least one pair of connected portions, the at least one pair of connected portions of each divided core being disposed along the first and second direct drive shafts to form at least one pair of connected portion arrays; and a yoke to magnetically connect the divided cores, the yoke including at least one pair of yoke elements formed of a magnetic conductive material, the at least one pair of yoke elements magnetically connecting the connected portions of the at least one pair of connected portion arrays respectively.