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:
May. 27, 2003
Filed:
Oct. 18, 2001
Junnosuke Nakatsugawa, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Hiromi Inaba, Hitachinaka, JP;
Yoshitaka Iwaji, Hitachi, JP;
Yukio Kawabata, Hitachinaka, JP;
Hiroyuki Tomita, Funabashi, JP;
Junji Kato, Takaishi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to supply an AC motor control apparatus which identifies the type of motor automatically, the AC motor control apparatus has a motor type identification means by which the type of motor connected to the motor control apparatus is identified by issuing the appropriate voltage command for motor type identification and judging from the detected current whether the motor rotor is equipped with a magnet and has magnetic salience. The AC motor control apparatus has a control scheme selection means which selects the appropriate control scheme according to the above-identified type of motor and controls the driving of the motor.