{HEAD ~ a rotor position sensor} , controlled by {TAIL ~ the position} of the rotor , for generating a rotor position signal  
{ HEAD ~ a rotor position sensor } , controlled by { TAIL ~ the position } of the rotor , for generating a rotor position signal
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH