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