Various alternative embodiments are used to improve the efficiency of {HEAD ~ the head} by channelling {TAIL ~ the magnetic flux} outside the gap 
Various alternative embodiments are used to improve the efficiency of { HEAD ~ the head } by channelling { TAIL ~ the magnetic flux } outside the gap
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH