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AssigneeBBC Brown, Boveri & Company, Limited
InventorKarl Blank
Estimating the term…
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. In order to reinforce the lead-through bolt and minimize the danger of breakage, a radially inwardly directed resilient force is applied to the outer end of the bolt. Provision is also made for internal as well as external cooling of the through-bolt by air which is taken in by respective air pick-up devices located on the surface of the shaft.
The combination with a rotor shaft of a dynamo-electric machine including a longitudinal bore containing an insulated exciter-current lead-in conductor bar and a radial bore extending from said longitudinal bore to the surface of the shaft, of an exciter-current lead-through bolt mounted in said radial bore, means securing the radially inner end of said lead-through bolt to said lead-in conductor bar, means securing an intermediate part of said lead-through bolt to a coductor member leading to an exciter winding located on said rotor, and means for applying a radially inwardly directed resilient force to the radially outer end of said lead-through bolt which comprises a locking component in the form of a cap nut secured to the outer end portion of said radial bore, said cap nut including means adjustable longitudinally of said lead-through bolt and which exerts a radially inwardly directed resilient pressure against the end of said lead-through bolt by means including a spring member interposed therebetween.
Dependencies are inferred from the claim text.