a motor drive for driving said motor on {HEAD ~ the basis} of {TAIL ~ the target motor current} set by said control unit; and 
of
a motor drive for driving said motor on { HEAD ~ the basis } of { TAIL ~ the target motor current } set by said control unit ; and
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH