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