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. 24, 1996
Filed:
Mar. 24, 1995
Applicant:
Inventors:
Kouji Minabe, Hitachinaka, JP;
Hideo Nishijima, Hitachinaka, JP;
Kouji Kaniwa, Yokohama, JP;
Hiroya Abe, Hiratsuka, JP;
Yoshio Narita, Hitachinaka, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
318606 ; 318479 ; 318599 ; 318600 ;
Abstract
A control unit of a direct-current motor used in a magnetic recording and reproducing device or the like, which generates a digital error signal by processing a rotational frequency signal (a rotational frequency signal and a rotational phase signal when necessary) detected from a motor to be controlled, and furthermore, obtains a digital correction signal by processing the value of the power source voltage and corrects the digital error signal using the correction signal to compensate power source voltage fluctuation.