Rotor of AC dynamoelectric machine with improved cooling and sta

Details Rotor of AC dynamoelectric machine with improved cooling and sta Rotor of AC dynamoelectric machine with improved cooling and sta

1984-11-14

1986-04-29

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

29598, 310 42, 310261, 310216, H02K 100

Patent

active

045859671

ABSTRACT:
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.

REFERENCES:
patent: 1158463 (1915-11-01), Eaton
patent: 1286782 (1918-12-01), Ringland
patent: 2522941 (1950-09-01), Gillen
patent: 2680822 (1954-06-01), Brainard
patent: 3234419 (1966-02-01), Picozzi
patent: 4028568 (1977-06-01), Tatsumi et al.
patent: 4377762 (1983-03-01), Tatsumi et al.

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