{TAIL ~ The object} of the invention is achieved by the fact that the magnetic rotor is covered with {HEAD ~ a thin, corrosion stable, tightly fitting metal sleeve} in the area of the magnets 
{ TAIL ~ The object } of the invention is achieved by the fact that the magnetic rotor is covered with { HEAD ~ a thin , corrosion stable , tightly fitting metal sleeve } in the area of the magnets
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH