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:
May. 24, 1994
Filed:
Jan. 29, 1993
Applicant:
Inventors:
Yoshihiro Ikemoto, Katano, JP;
Teruo Maruyama, Hirakata, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417 16 ; 417338 ; 4174 / ;
Abstract
A fluid-rotating apparatus comprises a positive displacement pump structure section for rotating the rotary shaft of each of a plurality of rotors synchronously. In controlling the synchronous rotation of the rotary shafts by a PLL control method, a gain-switching means device is provided to set a high gain in a PLL control circuit when the rotary shafts are accelerating or decelerating and setting a low gain therein when the rotary shafts are rotating in a steady state.