{HEAD ~ The motor} includes a buried magnet system and {TAIL ~ a stator operable} to produce an alternating magnetic field exerting alternating axial forces on the buried magnet system that has a self centering force and a required stiffness to reciprocate at a frequency near an alternating current supply frequency 
{ HEAD ~ The motor } includes a buried magnet system and { TAIL ~ a stator operable } to produce an alternating magnetic field exerting alternating axial forces on the buried magnet system that has a self centering force and a required stiffness to reciprocate at a frequency near an alternating current supply frequency
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