inducing poles in {HEAD ~ the rotor} by exciting at least some of the coils to establish fields which momentarily magnetize {TAIL ~ the teeth}, and then terminating the coil excitation 
inducing poles in { HEAD ~ the rotor } by exciting at least some of the coils to establish fields which momentarily magnetize { TAIL ~ the teeth } , and then terminating the coil excitation
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH