{HEAD ~ The system} 1, wherein the back EMF is induced in a sensing coil separate from {TAIL ~ the stator coil} 
{ HEAD ~ The system } 1 , wherein the back EMF is induced in a sensing coil separate from { TAIL ~ the stator coil }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL