By eliminating other velocity feedback signals contributed by other sources, {HEAD ~ running speed} of {TAIL ~ the motor} can be obtained 
of
By eliminating other velocity feedback signals contributed by other sources , { HEAD ~ running speed } of { TAIL ~ the motor } can be obtained
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH