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