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:
Dec. 11, 1984
Filed:
Jun. 15, 1982
Tsunehiko Takakusagi, Hitachi, JP;
Keizo Kikuchi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus for controlling the operation of a hydraulic machine such as a multi-stage pump turbine having a plurality of runners mounted on a common shaft and guide vanes arranged around respective runners to adjust the flow rate of water supplied to respective runners. The controlling apparatus has a speed detection means for detecting the speed of the hydraulic machine, comparator means for comparing the detected speed signal with a speed command to produce a stroke signal in accordance with a speed deviation signal obtained through the comparison, driving means for opening and closing the guide vanes associated with any selected runner in accordance with the stroke signal, and connecting means for connecting the stroke signal generating means to the driving means for the guide vanes associated with the other runner or runners in such a manner that a predetermined relationship is maintained between the opening degree of the guide vanes of the selected runner and the opening degree or degrees of the guide vanes associated with other runner or runners.