The magnetic properties of the rotor and cores are selected to insure that the pole strength in {TAIL ~ the teeth} will be retained during {HEAD ~ the changes} in electromagnet current 
The magnetic properties of the rotor and cores are selected to insure that the pole strength in { TAIL ~ the teeth } will be retained during { HEAD ~ the changes } in electromagnet current
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH