Electromagnetic actuators are disclosed for precisely and directly incrementing an output member along a given generally linear path. Included in one actuator is a pair of assemblies, one of which is movable with respect to the other along the given path. A first of the assemblies includes means for...http://www.google.es/patents/US4870306?utm_source=gb-gplus-sharePatente US4870306 - Method and apparatus for precisely moving a motor armature
Method and apparatus for precisely moving a motor armature
