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:
Apr. 23, 2002
Filed:
Dec. 20, 2000
Hajime Kondou, Wako, JP;
Yuuji Saito, Wako, JP;
Hideyuki Jinzai, Wako, JP;
Kazuaki Takizawa, Wako, JP;
Hiroaki Shinoki, Wako, JP;
Tomoyuki Itoh, Wako, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A control device for an alternating current motor includes: a target current generating unit which generates a current order value, based on a torque order, as a d-axis target current and a q-axis target current on dq coordinates; a current detection device which detects an alternating current supplied to each phase of a polyphase alternating current motor; a coordinate transforming unit which transforms the alternating current detected by the current detection device into a d-axis current and a q-axis current on the dq coordinates; and a vector control unit which carries out a current feedback control so that the d-axis current follows up the d-axis target current and the q-axis current follows up the q-axis target current. The vector control unit further includes: an operation switching unit which, depending on whether a back electromotive voltage of the alternating current motor is greater than or equal to a predetermined value, calculates one of a d-axis deviation and a q-axis deviation from the deviation between the d-axis target current and the d-axis current and the other one of the d-axis deviation and the q-axis deviation from the deviation between the q-axis target current and the q-axis current; and an integration controlling unit which outputs a d-axis integration voltage order value proportional to an integral value of the d-axis deviation and a q-axis integration voltage order value proportional to an integral value of the q-axis deviation. An alternating current supplied to each phase of the alternating current motor is controlled based on an output of the integration controlling unit.