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US 4,117,360 AGranted
Self-supporting amortisseur cage for high-speed synchronous machine solid rotor
AssigneeGeneral Electric Company
InventorEike Richter
Life of this patent
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Abstract
A self-supporting amortisseur winding in the form of a thin copper cage is situated about the solid rotor of a high-speed, permanent magnet synchronous machine in order to keep commutating reactance low. A high-strength wire is wound, with high tension, circumferentially about the cage to counteract the effects of centrifugal force on the cage when the machine is operating.
Claims12
In a high-speed solid rotor machine wherein the rotor comprises:
- a cylindrical nonmagnetic hub;
- a plurality of circumferentially-spaced longitudinally-extending pole pieces affixed to the outer surface of said hub;
- a plurality of permanent magnets disposed between said pole pieces;
- a shrink ring surrounding and retaining said pole pieces and permanent magnets;
- said shrink ring maintaining said hub, pole pieces and magnets in a state of compression over the total operating speed range of the machine, the improvement comprising:
- a cylindrical amortisseur cage fabricated of electrically conductive sheet, fitting tightly about and radially-outward of said shrink ring, said cage including circular end portions joined by a plurality of spaced ribs disposed about the circumference of said shrink ring;
- and
- means exhibiting high tensile strength wound circumferentially under tension about said cage for retaining said cage in contact with said shrink ring against centrifugal force when said machine is operating.
5 more elements
Dependencies are inferred from the claim text.