a surface length of each of the stator teeth is greater than {HEAD ~ a sum} of a stroke length of the motor and {TAIL ~ an axial thickness} of one of the magnets in the buried magnet system, and 
a surface length of each of the stator teeth is greater than { HEAD ~ a sum } of a stroke length of the motor and { TAIL ~ an axial thickness } of one of the magnets in the buried magnet system , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH