H - Electricity – 02 – K
Patent
H - Electricity
02
K
310/95
H02K 3/46 (2006.01) H02K 3/48 (2006.01) H02K 3/51 (2006.01)
Patent
CA 1140976
14 48,436 ABSTRACT OF THE DISCLOSURE Surface currents are induced in dynamoelectric machine rotor body portions by negative sequence currents during unbalanced load operation. The surface currents are shunted away from retaining rings which are respect- ively situated on opposite axial ends of the rotor and function to restrain radial movement of conductor end turn portions which extend axially beyond the rotor's body portion. The retaining rings are shrink fitted on both ends of the rotor's body portion so as to structurally extend that body portion in both axial directions. Shunt- ing the rotor surface currents away from the retaining rings provides an operating temperature therein of suffi- ciently low level to maintain high electrical joint integ- rity between the retaining ring and rotor. A mantle of highly conductive material surrounds both retaining rings in intimate electrical contact therewith. The mantle thickness is at least one-half depth of electrical current penetration for the rotor surface current's frequencies. The mantle is electrically connected to the rotor body portion preferably through interference fits with radial extensions of slot wedges are situated in longitudinal slots formed in the rotor body radially outside electrical conductors disposed in those slots. The wedges constitute electrically conductive material and provide longitudinal electrical conductor retention in the rotor slots during high speed rotor rotation. Components joined through the interference fit include the mantle and the wedges' radial extensions. A material softer and of higher electrical 48,436 conductivity than either of those joined components is preferably interposed as a plating material on either or both components.
357792
Mcconnell And Fox
Westinghouse Electric Corporation
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