Superconducting generator rotor

Claim 1

A superconducting generator rotor comprising: an inner rotor containing liquid helium; a superconducting coil soaked in the liquid helium in the inner rotor; means for supplying liquid helium to the inner rotor; a main shaft with a cavity for coaxially supporting the inner rotor, wherein the main shaft is adapted to be electrically connected to ground; a collector ring fixed to and electrically insulated from the main shaft, wherein the collector ring is adapted to be in sliding contact with an electrode; an electric lead, axially penetrating but electrically insulated from the main shaft, for leading electricity to the superconducting coil; a connector for electrically connecting the collecting ring and the electric lead; means for cooling the electric lead utilizing gas helium evaporated in the inner rotor; and means for confining the gas helium utilized for cooling the electric lead in a coolant flow passage made of electrical insulation material in the cavity in the main shaft, so as to avoid electric discharge through the gas helium between the connector and the main shaft.

Claim 6

An apparatus comprising: a superconducting generating rotor comprising: a housing: a superconducting generator coil mounted in said housing; helium contained in said housing, said helium including liquid helium surrounding said coil and gas helium evaporated from said liquid helium; means for supplying said liquid helium to said coil; an electric lead connected to said coil; and means for removing said gas helium from said coil, said removing means including means for confining gas helium next to said electric lead to cool said electric lead, and means for electrically insulating said gas helium from said housing to prevent electrical discharge between said electrical lead and said housing through said gas helium; and means for applying excitation control to said coil, including means for raising said coil and said lead to a potential or more than 1 kV.

Claim 7

An apparatus comprising: a superconducting generating rotor comprising: a housing: a superconducting generator coil mounted in said housing; helium contained in said housing, said helium including liquid helium surrounding said coil and gas helium evaporated from said liquid helium; means for supplying said liquid helium to said coil; an electric lead connected to said coil; and means for removing said gas helium from said coil, said removing means including means for confining gas helium next to said electric lead to cool said electric lead, and means for electrically insulating said gas helium from said housing to prevent electrical discharge between said electrical lead and said housing through said gas helium; and means for applying excitation control to said coil, including means for raising said coil and said lead to a potential or more than 1 kV.