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:
Feb. 19, 2008
Filed:
Feb. 23, 2006
Koichiro Nagata, Mito, JP;
Toshiaki Okuyama, Tokai, JP;
Haruo Nemoto, Hitachinaka, JP;
Toshio Katayama, Hitachi, JP;
Koichiro Nagata, Mito, JP;
Toshiaki Okuyama, Tokai, JP;
Haruo Nemoto, Hitachinaka, JP;
Toshio Katayama, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A motor driving apparatus includes: a current instruction calculator, for calculating a current instruction value based on a deviation between a speed instruction value and an estimated speed value; a current controller, for controlling an output current based on the current instruction value; a frequency instruction calculator, for calculating a frequency instruction value based on an output voltage instruction value or an output voltage detection value, wherein, when an induction motor is to be activated, the current instruction value and the frequency instruction value are calculated directly using the speed instruction value, and an output current and an output frequency are controlled in accordance with the current instruction value and the frequency instruction value.