Patent ID: 7876011

Claim:
A rotor of a generator, comprising: a rotor yoke comprising a rotor axis and two ends in an axial direction; a plurality of permanent magnets which are shorter than the rotor yoke in the axial direction and which are located on an outside of the rotor yoke leaving a short portion of the rotor yoke free at the two ends; a plurality of spacers of a non-magnetic material located between the permanent magnets so that at least one of the plurality of spacers is located between adjacent permanent magnets; at least two end barriers which are located on the free portions of the rotor yoke so that at least one of the two end barriers is located at each free portion; a thin sheet of a non-magnetic material which is folded around the plurality of permanent magnets and the plurality of spacers covering the entire length of the rotor including the end barriers; and an air tight membrane which is located on an outside of the thin sheet and which is sealed to the ends of the rotor yoke so that the membrane and the rotor yoke together form an air tight enclosure which is filled with resin, wherein the resin is disposed between the rotor yoke and the plurality of magnets, between the plurality of magnets and the non-magnetic material, between the non-magnetic material and the air tight membrane, between the end barriers and the plurality of magnets, between the end barriers and the air tight membrane, and between each one of the plurality of spacers and an adjacent permanent magnet, so that the rotor yoke, the plurality of magnets, the plurality of spacers, the thin sheet and the end barriers are firmly bonded to each other.