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. 02, 2003
Filed:
Sep. 20, 2001
Applicant:
Inventors:
Junnosuke Nakatsugawa, Hitachi, JP;
Yukio Kawabata, Hitachinaka, JP;
Tsunehiro Endo, Hitachiota, JP;
Masashi Kitamura, Mito, JP;
Junya Kaneda, Tokai, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 1/46 ; H02P 3/18 ; H02P 5/28 ; H02P 7/36 ;
U.S. Cl.
CPC ...
H02P 1/46 ; H02P 3/18 ; H02P 5/28 ; H02P 7/36 ;
Abstract
Providing control apparatus with a maximum torque/current ratio control means by which the relationship between the maximum torque and current amplitudes and the relationship between the maximum torque and current phases are converted to numeric expressions including one or more than one linear function with the torque taken as the parameter, then the current amplitude command and current phase command data that yields a maximum torque is computed, and computed data is sent as an output signal.