초록 ▼

A shaft of a high-speed AC dynamoelectric machine includes axially directed flutes which define lands upon which an aligned stack of annular laminations of magnetic steel are shrunk-fit. The flutes concentrate contact forces generated by shrink-fitting in known positions and the non-contacting regio

A shaft of a high-speed AC dynamoelectric machine includes axially directed flutes which define lands upon which an aligned stack of annular laminations of magnetic steel are shrunk-fit. The flutes concentrate contact forces generated by shrink-fitting in known positions and the non-contacting regions aligned with the flutes provide a small amount of resilience which permits thermal expansion of the rotor to occur without forcing a migration in the shrunk-fit contacting surfaces. The flutes may be used as axial ventilation holes whose effectiveness is enhanced by radially directed air flow channels communicating between the flutes and the outer surface of the rotor. In rotors using laminations which include keyways therein, the fluted shaft provides sufficient keying of the lamination to the shaft so that a key may be omitted. In order to avoid stacking of burrs in the laminations, succeeding groups of laminations are angularly indexed so that the effects of any recurring burrs are distributed about the circumference of the rotor and are thereby cancelled out.

대표청구항 ▼

A rotor for an AC dynamoelectric machine comprising: a shaft including a plurality of flutes extending axial a surface of said shaft, with portions of the surface between said flutes forming a plurality of lands; a stack of substantially annular laminations having an axial hole extending therethroug

A rotor for an AC dynamoelectric machine comprising: a shaft including a plurality of flutes extending axial a surface of said shaft, with portions of the surface between said flutes forming a plurality of lands; a stack of substantially annular laminations having an axial hole extending therethrough and having a substantial number of laminations shrunk-fit on said lands; the total circumferential surface of said lands when divided by the total circumferential surface of said shaft being about 50 percent.