Inductive device for precisely positioning a movable member

An inductive device for precisely positioning a movable member along a rectilinear path, wherein a motor is provided for driving said movable member along said path, comprising:

• a plane conductive circuit forming windings, said windings comprising, in turn, a plurality of equispaced parallel elements, means for supplying said plane circuit with a relatively high-frequency electric current, said plane circuit being oriented parallel to said path and attached to said movable member, a plurality of magnetic signal receiving heads each provided with an air gap in a plane parallel to said plane conductive circuit disposed along said plane circuit, the distance between said air gaps measured in a direction parallel to said path being a function of the distance between adjacent ones of said elements, and a control circuit for receiving the signals generated by said heads and generating, a signal for controlling said motor in response to said received signals.