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Internally air cooled exciter-current lead-through bolt interconnecting rotor shaft-enclosed lead-in conductor bar and terminal conductor bar leading to rotor winding

  • US 4,074,155 A
  • Filed: 12/30/1975
  • Issued: 02/14/1978
  • Est. Priority Date: 01/16/1975
  • Status: Expired due to Term
First Claim
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1. 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 a radially extending exciter-current lead-through bolt mounted in and extending through said radial bore, means securing the radially inner end of said bolt in said lead-in conductor bar, means securing the radially outer part to a terminal conductor bar leading to an exciter winding located on said rotor, and means for cooling said bolt comprising a ventilating tube disposed within a longitudinal bore extending through said bolt, said tube being smaller than the bolt bore to establish a gap between said tube and the wall of the bore, and a ventilating hood mounting the outer end of said ventilating tube and which is mounted atop the radially outer end of said bolt in the ambient air, said hood including a first port extending through the wall thereof placing said gap in communication with the ambient air and a second port placing the outer end of said ventilating tube in communication with the amient air, said ports establishing an air inlet and air outlet respectively thereby to establish a circulating flow path for ambient cooling air in one radial direction through said gap and in the opposite direction through said ventilating tube.

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