Flux Directing, Pole Span Setting, Feature on Rotor Lamination of Air-Cooled Electric Motor/Generator

A lamination, usable together with additional laminations to provide a rotor arrangement mountable on a shaft for rotation relative to a stator of a rotary electric machine arrangement having a plurality of laminations joined together to form a multilayer laminated rotor, comprising:

• a solid section surrounding an opening within which the shaft is receivable, the solid section including an outside diameter, magnet receiving voids, and steps delimiting a plurality of pole spans from flux directing features at sides of each of the pole spans,
• wherein adjacent flux directing features between adjacent pole spans are disposed on opposite sides of recesses to permit cooling air flow.

A rotary electric machine arrangement including a stator and a rotor having a plurality of laminations joined together and mountable on a shaft for rotation relative to the stator, comprising:

• a solid section surrounding an opening within which the shaft is receivable, the solid section including an outside diameter, magnet receiving voids, and steps delimiting a plurality of pole spans from flux directing features at sides of each of the pole spans,
• wherein adjacent flux directing features between adjacent pole spans are disposed on opposite sides of recesses permitting cooling air flow past the rotor.