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