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