Abstract: A pair of spaced, toroidal-shaped, electromagnetic coils, when supplied with alternating DC current, cause a floating armature to reciprocate therebetween. The armature itself includes a second pair of back to back, toroidal-shaped electromagnetic coils mounted on a non-conductive linear output drive rod which extends through an opening in at least one of the first mentioned pair of coils to deliver the force generated by the reciprocating armature to a suitable force transmitting mechanism. The armature floats between the first pair of electromagnets and is so positioned with respect thereto that its path of movement is totally between the two opposed electromagnetic coils and never enters the central opening formed therein, whereby frictional losses are eliminated, the strength of the magnetic flux field is maximized and the magnetic force generated by each electromagnet acts more consistently over the entire armature throughout its path of movement.

Abstract: A pair of spaced, toroidal-shaped, electromagnetic coils are enclosed in a cylindrical housing and when supplied with alternating D.C. current, cause a floating armature to reciprocate therebetween. The armature includes a non-conductive linear output drive rod secured thereto and extending therefrom through the central opening in at least one of the electromagnetic coils to deliver the force generated by the reciprocating armature to a suitable force transmitting mechanism. The armature floats within the cylindrical housing and is so positioned with respect to the electromagnets, that its path of movement is totally between the two opposed electromagnets and never enters the central opening formed therein, whereby frictional losses are eliminated, the strength of the magnetic flux field is maximized, and the magnetic force generated by each electromagnet acts more consistently over the entire armature throughout its path of movement.