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