Internally air cooled exciter-current lead-through bolt intercon

Details Internally air cooled exciter-current lead-through bolt intercon Internally air cooled exciter-current lead-through bolt intercon

1975-12-30

1978-02-14

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

H02K 900

Patent

active

040741559

ABSTRACT:
An exciter-current lead-through bolt which is passed through a radial bore in the rotor shaft of a dynamo-electric machine, especially a turbo-generator, and screwed into an exciter-current lead-in conductor bar which lies in a longitudinally extending bore within the shaft. The radially outer part of the lead-through bolt is mechanically and electrically connected with a terminal conductor bar leading to the exciter winding located on the rotor. The lead-through bolt preferably made of steel because of its high mechanical strength is cooled internally by means of a forced air circulation system including a tube inserted in a longitudinal bore through the bolt, the diameter of the bore being greater than the external diameter of the tube in order to provide an annular space therebetween for flow of air from an air inlet port outside of the shaft radially inward to the end of the tube adjacent the inner end of the bolt, then into the tube and radially outward therethrough to an air discharge port also located outside of the rotor shaft and at a radial distance greater than the air inlet port.

REFERENCES:
patent: 3034003 (1962-05-01), Seidner
patent: 3359438 (1967-12-01), Hylen
patent: 3393333 (1968-07-01), Kudlacik
patent: 3457440 (1969-07-01), Horsley
patent: 3571634 (1971-03-01), Sato
patent: 3733502 (1973-05-01), Curtis
patent: 3808490 (1974-04-01), Khutoretsky
patent: 3878413 (1975-04-01), Madsen
patent: 3894253 (1975-07-01), Willyoung
patent: 3955111 (1976-05-01), Weghaupt

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