Patent ID: 7154198

Claim:
A linear motor comprising: two stators having a plurality of salient poles arranged at a predetermined interval on surfaces opposing each other, and extending in parallel; and a slider having three slider blocks which form magnetic poles of three different phases by action of three-phase AC windings, and capable of moving along an extension direction of the two stators; wherein each of the slider blocks has two permanent magnet groups each consisting of a plurality of permanent magnets disposed on a surface of the corresponding slider block opposing the respective stator in an array of alternating north and south polarities along a slider moving direction, the two permanent magnet groups are placed so as to generate driving forces acting in the same direction between the resilient poles of the two stators and the slider blocks along the slider moving direction, a coil wound between the two permanent magnet groups is disposed to simultaneously generate magnetic flux on opposite surfaces of the slider blocks facing the two stators, and in each of the slider blocks, positions of front edges in the slider moving direction relative to the salient poles of the respective stators opposing the slider blocks are shifted from each other by approximately 130 to 230 electrical degrees.