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:
Sep. 04, 2012
Filed:
Mar. 25, 2008
Toshio Takahashi, Tokyo, JP;
Seiichiro Yoshinaga, Tokyo, JP;
Hirohisa Wakisaka, Chigasaki, JP;
IHI Corporation, , JP;
Abstract
A braking mechanism is provided that is suitable for an expansion turbine that rotates at high speed. Upper end salient polesandare formed in two opposite places on the outer peripheral upper end of a rotating shaft, and lower end salient polesandare formed in two opposite places on the outer peripheral lower end of the rotating shaftsuch that they are staggered in the vertical direction with respect to the upper end salient polesand. A casingis provided in a location facing an outer periphery of the rotating shaft, and an excitation coilis provided on the casingfor forming a magnetic path between the upper end salient polesandand the lower end salient polesand. By rotation of the rotating shaft, and by the magnetic path formed by the excitation coil, eddy currents are generated in the casing