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