 exciting {TAIL ~ each} of said first and second coils with {HEAD ~ a signal simulating}, both in magnitude and time, drive motor pulsing 
exciting { TAIL ~ each } of said first and second coils with { HEAD ~ a signal simulating } , both in magnitude and time , drive motor pulsing
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH