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