Patent ID: 7859144

Claim:
An electromagnetic motor comprising: a stator having: a non-ferrous post of a selected length having a first end and a second end and a first diameter; first and second stator magnetic flux producing elements spaced apart from each other around said post; and an intermediate stator magnetic flux producing element around said post between said first and second stator flux producing elements; with each of said first and second stator magnetic flux producing elements and said intermediate stator magnetic flux producing element each having an internal diameter that is slightly larger than said first diameter and said stator having a third diameter being a maximum external diameter of the stator components; a piston encircling said stator having: a piston magnetic flux producing element ring having a first and second end with an internal diameter at least slightly greater than said third diameter and an external diameter being a fourth diameter; and first and second ferro-magnetic rings one of which is coupled to each of said first and second ends of said piston magnetic flux producing element ring with each of said first and second ferro-magnetic rings having an internal diameter at least slightly greater than said third diameter and an external diameter being at least as large as said fourth diameter; wherein said intermediate stator flux producing element has a first magnetic polarity and said piston magnetic flux producing element has a second magnetic polarity with said first and second magnetic polarities being in opposite axial directions relative to said post; and wherein a home position of said piston is substantially centered relative to said intermediate stator flux producing element when no magnetic flux is being supplied by said first and second stator magnetic flux producing elements.