The speed control module controls a speed of a motor based on {HEAD ~ an error signal} generated based on a desired speed and {TAIL ~ back electromotive force} 
generated based on
The speed control module controls a speed of a motor based on { HEAD ~ an error signal } generated based on a desired speed and { TAIL ~ back electromotive force }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL