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:
Jan. 23, 1996
Filed:
Mar. 05, 1993
Applicant:
Inventors:
Osami Matsushita, Ibaraki, JP;
Mitsuho Yoneyama, Ibaraki, JP;
Naohiko Takahashi, Ibaraki, JP;
Yasuo Fukushima, Tsuchiura, JP;
Minoru Hiroshima, Ushiku, JP;
Tadashi Kaneki, Tsuchiura, JP;
Yoshiaki Abe, Ibaraki, JP;
Naofumi Sakanashi, Ibaraki, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 905 ;
Abstract
A controller of magnetic bearing controls the rotor speed with a reduced drive current while suppressing the rotor vibration. The controller implements the ABS control, N-cross control, N-straight control and FF control in proper combination in addition to the basic PID control. A computer in the controller determines the activation of each control in accordance with a predetermined table of control plan in response to the detected rotor speed.