then rotating the rotor by selectively exciting the coils while {HEAD ~ the tooth magnetization} remains to produce {TAIL ~ a magnetic rotational force} on the rotor; and 
remains to produce
then rotating the rotor by selectively exciting the coils while { HEAD ~ the tooth magnetization } remains to produce { TAIL ~ a magnetic rotational force } on the rotor ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH