Patent ID: 7906877

Claim:
A linear motor device, comprising: a linear motor and a control section that controls the linear motor, the linear motor comprising a magnet member composed of permanent magnets having respective N poles and S poles alternately arranged in an axial direction, and a coil member which is located orthogonally to said axial direction with respect to the magnet member and through which said magnet member is movable in the axial direction relative to the coil member, said control section controlling current conducted through said coil member so as to move said magnet member relative to said coil member by reciprocating said magnet member within a use range, said use range corresponds to a range in an intermediate portion of a magnetic pole pitch where said magnetic pole pitch is a range between magnetic poles in each of the permanent magnets, wherein the attractive force in said range in said intermediate portion varies insignificantly relative to the attractive force in a vicinity of the magnetic poles of each of the permanent magnets which increases in variation wherein the attractive force in said range in said intermediate portion varies insignificantly relative to the attractive force, which increases in variation in a vicinity of the magnetic poles of the magnetic member.