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