A pair of electromagnets having ferromagnetic cores with {HEAD ~ end} adjacent {TAIL ~ a toothed ferromagnetic rotor} are energized to induce temporary magnetic poles in the respective rotor teeth 
adjacent
A pair of electromagnets having ferromagnetic cores with { HEAD ~ end } adjacent { TAIL ~ a toothed ferromagnetic rotor } are energized to induce temporary magnetic poles in the respective rotor teeth
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH