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