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