{HEAD ~ A drive circuit} selectively applies current to each electromagnet to effect {TAIL ~ rotational force} on the rotor poles 
{ HEAD ~ A drive circuit } selectively applies current to each electromagnet to effect { TAIL ~ rotational force } on the rotor poles
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH