Craig & Antonelli
Rotor having improved arm structure to reduce tensile stresses
 A rotor for use with rotary electric machinery, which includes a rotary shaft, a rotor core disposed around the rotary shaft and consisting of a plurality of silicon steel plates laminated to a predetermined thickness in the axial direction of the rotary shaft, a plurality of mounts secured to the rotor core by means of dove-tail joints as well as by welding and disposed on the inner circumferential surface of the rotor core plurality sets of arms, each set consisting of at least two arms whose one ends are connected to the mounts by welding, and whose other ends are connected to the rotary shaft by welding, said arms being inclined or curved to the radial direction in cross section perpendicular to the axial direction of the rotary shaft. 
Hitachi, Ltd.
H
H02K
inventional
Tadasi
Sonobe