{HEAD ~ The servo control} energizes {TAIL ~ the linear electromagnetic actuator} with a current which always has the proper polarity and value to compensate for losses 
{ HEAD ~ The servo control } energizes { TAIL ~ the linear electromagnetic actuator } with a current which always has the proper polarity and value to compensate for losses
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH