Electromagnetic actuator having inherently decelerating actuation between limits 

Patent No. 7,225,770

Issued: June 5, 2007
Filed: November 24, 2004

Inventor: Simpson; Roger T. (Ithaca, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI) 

An electromagnetic valve actuator system for controlling the operation of a valve in an internal combustion engine comprising a valve having a valve stem with a valve head at one end. The valve is reciprocable along the longitudinal central axis of the valve stem to alternatingly move the valve head between a first position and a second position. A first coil is positioned on a first laminated core having a gap and a thickness. A second coil is positioned on a second laminated core having a gap and a thickness. The gaps of the first and second cores are aligned. An armature on the valve stem passes through the gaps of the first and second laminated cores, such that when the armature is centered in either of the gaps at least a portion of the armature extends slightly passed the thickness of the other laminated core.


This application claims an invention, which was disclosed in Provisional Application No. 60/528,465, filed Dec. 10, 2003, entitled "ELECTROMAGNETIC ACTUATOR HAVING INHERENTLY DECELERATING ACTUATION BETWEEN LIMITS". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference

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