The south pole on {HEAD ~ tooth} 1 is allowed to decay, the diminution occurring at a rate depending on the hysteresis of {TAIL ~ the rotor material} 
The south pole on { HEAD ~ tooth } 1 is allowed to decay , the diminution occurring at a rate depending on the hysteresis of { TAIL ~ the rotor material }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL