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:
Dec. 11, 2012
Filed:
Jan. 20, 2010
Kozo Ide, Kitakyushu, JP;
Shinya Morimoto, Kitakyushu, JP;
Masanobu Inazumi, Kitakyushu, JP;
Young Doo Yoon, Seoul, KR;
Seung-ki Sul, Seoul, KR;
Kozo Ide, Kitakyushu, JP;
Shinya Morimoto, Kitakyushu, JP;
Masanobu Inazumi, Kitakyushu, JP;
Young Doo Yoon, Seoul, KR;
Seung-ki Sul, Seoul, KR;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-Shi, JP;
Other;
Abstract
An alternating-current motor control apparatus includes a voltage controller configured to output a command voltage vector so that the command voltage vector is time-averaged for time periods, a square-wave voltage generator configured to control, every time period, amplitudes and phases of voltages to be applied to an alternating-current motor, a current detector configured to detect motor currents at a timing synchronized with periods 1/N-th of the time periods, where N is equal to or larger than one, a coordinate transformation section configured to perform coordinate transformation to transform the motor currents into two-phase currents, an envelope extractor configured to extract two-phase currents as waveforms having amplitudes that periodically change from the two-phase currents, and extract envelopes of the waveforms, and a magnetic-pole-position computing section configured to compute a magnetic-pole position using the envelopes.