The orientation of these gaps in the back iron are configured to achieve {HEAD ~ the desired operation} of {TAIL ~ the design} 
of
The orientation of these gaps in the back iron are configured to achieve { HEAD ~ the desired operation } of { TAIL ~ the design }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL