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:
Jul. 11, 2006
Filed:
May. 25, 2000
Masanobu Inazumi, Fukuoka, JP;
Masanori Kawatani, Fukuoka, JP;
Noriaki Sueyoshi, Fukuoka, JP;
Ryuichi Oguro, Fukuoka, JP;
Masanobu Inazumi, Fukuoka, JP;
Masanori Kawatani, Fukuoka, JP;
Noriaki Sueyoshi, Fukuoka, JP;
Ryuichi Oguro, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
In sensorless vector control performed through use of a rotation speed of a synchronous motor 6 and the position of a rotor, a positive current is caused to flow to a γ axis on the assumption that a 'd' axis serving as a true magnetic axis is out of phase with the γ axis by only an angle of load θe, whereby torque which is proportional to iγ sin θe and directed toward the γ axis arises in the magnetic axis. Accordingly, a deviation between a d-q axis serving as a true magnetic axis and a γ-δ axis serving as a control axis is eliminated. Even if load is exerted on the motor, the γ axis serving as a control axis is constantly aligned with the 'd' axis serving as the magnetic axis of the synchronous motor, thereby enabling excellent vector control.