{TAIL ~ A permanent magnet} 13 which is separate from {HEAD ~ a permanent magnet} 5 used for driving is mounted on the rotor 
{ TAIL ~ A permanent magnet } 13 which is separate from { HEAD ~ a permanent magnet } 5 used for driving is mounted on the rotor
TAIL TAIL 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