Patent ID: 7449803

Claim:
An electromagnetic motor comprising: a stator having: a non-ferrous tube of a selected axial length having a first end and a second end; a pair of end caps, one of said end caps closing each of said first and second ends of said tube; first and second stator magnetic flux producing elements surrounding said tube and spaced apart from each other a first axial distance with each of said first and second stator elements on an opposite side of a point on said tube half-way between said first and second ends of said tube closest to, and spaced apart from, a correspondingly numbered end of said tube with each of said first and second stator magnetic flux producing elements disposed to direct a magnetic flux axially within said tube in the direction of said first and second ends within said tube; and a third stator magnetic flux producing element at said first end of said tube spaced apart a second axial distance from a closest side of said first stator magnetic flux producing element wherein said second axial distance is greater than said first axial distance with said third stator magnetic flux producing element providing magnetic flux of a first polarity axially into said tube; and a slider disposed to move axially within said tube between said first and second ends, said slider includes a slider magnetic flux producing element having a first and a second side and a width axially that is substantially equal to said first axial distance, said first side of said slider magnetic flux producing element providing flux of said first polarity axially toward said first end of said tube and said second side providing flux of a second polarity axially toward said second end of said tube; wherein an at rest position of said slider magnetic flux producing element is substantially centered relative to a center of the first distance between said first and second stator magnetic flux producing elements.