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. 29, 1994
Filed:
Apr. 18, 1991
Hiroshi Katayama, Hitachi, JP;
Fumio Tajima, Ibaraki, JP;
Taizo Miyazaki, Hitachi, JP;
Shigeki Morinaga, Hitachi, JP;
Nobuyoshi Mutoh, Katsuta, JP;
Seiichi Narushima, Landsberg am Lech, DE;
Yuji Sato, Mito, JP;
Toshio Nakamoto, Katsuta, JP;
Takashi Takahashi, Katsuta, JP;
Toshio Osada, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A speed control apparatus in which for sampling features of a speed fluctuation and generating a speed fluctuation correcting signal, an arithmetic operation can be simplified and can be performed by an inexpensive arithmetic and operation unit, thus requiring no expensive arithmetic operation unit. The speed control apparatus is also capable of reducing torque ripples and speed fluctuations quickly even when the load of an object to be controlled is changed.