The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 10, 1987
Filed:
Jan. 10, 1986
Toshiki Hirao, Kobe, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A rotor for a superconducting rotating electric machine of the type having a coil-carrying shaft including torque tubes connected to opposite ends thereof. A circumferentially-extending groove is formed in the coil-carrying shaft between one of the torque tubes and a recess in the coil-carrying shaft in which superconducting field coils are housed. The radially outer end of the groove opens into a space for liquid helium provided between the outer surface of the coil-carrying shaft and a helium-sealing outer tube. Heat entering the coil-carrying shaft and conducted in a path along the torque tubes is absorbed by the liquid helium within the groove and is prevented from reaching the superconducting field coils. The radially inner end of the groove can be sealed, or it can be connected to a central cavity of the coil-carrying shaft by one or more radially-extending holes through which liquid helium can flow for improving the circulation of helium through the coil-carrying shaft.