The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 1986
Filed:
Nov. 14, 1984
John A Mayer, Clifton Park, NY (US);
William H Miller, Albany, NY (US);
General Electric Company, Fort Wayne, IN (US);
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.