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:
Jun. 16, 2009
Filed:
Jun. 28, 2007
Naoki Oomura, Fuji, JP;
Kazunobu Nagai, Yokohama, JP;
Shinichi Kominato, Tokyo, JP;
Yukihisa Hasegawa, Yokohama, JP;
Minoru Awazu, Yokohama, JP;
Naoki Oomura, Fuji, JP;
Kazunobu Nagai, Yokohama, JP;
Shinichi Kominato, Tokyo, JP;
Yukihisa Hasegawa, Yokohama, JP;
Minoru Awazu, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A motor control unit including a rotational position detector detecting a rotational position of a brushless DC motor; a current detector detecting a current of the brushless DC motor; a coordinate transformer executing rotational coordinate transformation of the current by a control phase angle and obtaining a d-axis current and a q-axis current; a current controller generating a command d-axis voltage based on a d-axis current error, and generating a command q-axis voltage based on a q-axis current error; a coordinate transformer generating a three-phase command voltage by the control phase angle; a conductive signal generator; and a position controller that, when executing a positioning operation, maintains the command d-axis current at a constant value and the command q-axis current at zero, and that controls the control phase angle based on a difference between a target stop rotational position and a rotational position detected by the rotational position detector.