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