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. 28, 2013
Filed:
May. 12, 2010
Kozo Ide, Fukuoka, JP;
Shinya Morimoto, Fukuoka, JP;
Sungmin Kim, Seoul, KR;
Seung-ki Sul, Seoul, KR;
Kozo Ide, Fukuoka, JP;
Shinya Morimoto, Fukuoka, JP;
Sungmin Kim, Seoul, KR;
Seung-ki Sul, Seoul, KR;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-Shi, JP;
Other;
Abstract
An alternating-current motor control apparatus includes an inverter unit, a current-command divider, a current controller, a torque-variation calculator, and a phase angle generator. The current-command divider is configured to divide a command current amplitude into command current components based on a phase-angle command value that is a sum of the phase angle and an alternating current signal. The torque-variation calculator is configured to calculate a motor electric power based on the command voltage and either the motor current or the command current components and to calculate a torque variation based on the motor electric power. The phase angle generator is configured to generate a phase angle based on the torque variation.