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