Abstract: A permanent magnet rotor has a north and a south pole piece each separated into two sections by a central nonmagnetic insert to reduce the quadrature flux. The pole piece sections are welded to the central nonmagnetic insert, two nonmagnetic segments are welded to either end of the north pole piece and two magnetic segments are welded to either end of the south pole pieces to form two half rings. The half rings are secured about a solid shaft of magnetic material having a central portion with a rhombic cross section. The centerline of the half rings is aligned with the diagonal of the square central portion. The half rings are bolted to one another. The sides of the shaft and the inner faces of the half rings form four apertures extending the axial length of the pole pieces. A magnet which adds no structural strength to the rotor is positioned in each of the apertures, respectively.

Abstract: A permanent magnet rotor has a north and a south pole piece each separated into two sections by a central nonmagnetic insert to reduce the quadrature flux. The pole piece sections are welded to the central nonmagnetic insert, two nonmagnetic segments are welded to either end of the north pole piece and two magnetic segments are welded to either end of the south pole pieces to form two half rings. The half rings are secured about a solid shaft of magnetic material having a central portion with a rhombic cross section. The centerline of the half rings is aligned with the diagonal of the square central portion. The half rings are bolted to one another. The sides of the shaft and the inner faces of the half rings form four apertures extending the axial length of the pole pieces. A magnet which adds no structural strength to the rotor is positioned in each of the apertures, respectively.

Abstract: A permanent magnet rotor uses a magnetic shaft having a rhomboidal cross section. Fastening means secure clamp pieces which in turn retain pole pieces and the permanent magnets.

Abstract: An air-sealed oil deflector is disclosed which prevents leakage of oil from bearings of a rotating shaft and which prevents the ingestion of unfiltered atmospheric air which can lead to contaminant build-up and damage to the shaft. The air-sealed deflector includes an annular plenum surrounding the shaft and an annular feed slot interposed between the shaft and the plenum to fluidly interconnect the plenum with the chamber between at least two seal rings immediately adjacent the shaft. The plenum is adapted to receive a continuous flow of forced air from an air supply system including an air prime mover and means for filtering air drawn from the atmosphere which serves as the ultimate air source. The plenum being relatively large in volume, and having a cross-sectional area large with respect to the air feed conduit to the plenum, provides a very uniform source for air flow radially inward, in a sheet-like fashion, toward the shaft through the feed slot.