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