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