Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 30, 2010
Patent Application Number
11919876
Date Filed
May 29, 2006
Patent Primary Examiner
Patent abstract
A long-proportional-stroke force motor which outputs force proportional to the exciting current. The motor has a magnetic circuit wherein a non-magnetic spacer is positioned axially between a magnetic guide and a magnetic sleeve. An armature moves within a central opening defined by the guide, the spacer and the sleeve. An end portion of the guide, adjacent to the spacer, has a sectional profile through a stepped surface facing radially outward and the corners of the steps define a curve which satisfies the following expressions:
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