Patent ID: 7839029

Claim:
A linear motor comprising: two stators each having projecting poles arranged on opposite surfaces thereof at predetermined intervals, the stators extending parallel to each other; three types of slider blocks acting as magnetic poles for three phases on the basis of AC windings for three phases; and an slider having permanent magnets arranged on two surfaces of each of the slider blocks which are opposite the two stators so as to provide alternate polarities, the slider being movable between the two stators along an extending direction of the stators, wherein the two stators each comprise a plurality of stator blocks arranged in the moving direction of the sliders so that the projecting poles are maintained at predetermined intervals, boundary surfaces are formed in adjacent stator blocks so as to be displaced relative to one another between the two opposite blocks by a distance Ld in the moving direction of the sliders, and when a distance between end surface of the slider blocks is defined as L and the overall length of one stator block is defined as L 0 , the components are arranged such that Ld>L/3 and (L 0 −Ld)>L/3.