Patent ID: 6770989
Filing Date: 2004-08-03
Classification: H02K

Abstract:
Linear motor having a slender long stator, a shifter located so as to face said stator, a plurality of magnets located on a stator side and a plurality of armatures located on a shifter side so as to face said magnets, for moving said shifter along said stator by switching voltage applied on said armature, said linear motor comprising:said shifter being in the shape of a cylinder and being fitted on said stator with a play; a plurality of said magnets being symmetrically located with respect to a central axis of said stator; said armatures being symmetrically located with respect to said central axis so as to respectively face said magnets; said shifter having a support portion laterally bridged between a plurality of said armatures and a plurality of shifter side base portions being annularly formed with said central axis as its center; said support portion being supported by said shifter side base portion so as to be located on an outer peripheral side of said shifter side base portion; said support portion having a plurality of core portions extending from said support portion toward said central axis so that said shifter side base portions are respectively located between said core portions; said core portion fitting a coil thereon, and said coil and said core portion comprising said armature; and said armature being located adjacent said stator side rather than said support portion and said shifter side base portion being adjacent to said stator side.