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:
Sep. 03, 2013
Filed:
Aug. 29, 2012
Mamoru Takaki, Fukuoka, JP;
Shinya Morimoto, Fukuoka, JP;
Masaki Hisatsune, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu-Shi, JP;
Abstract
This inverter device includes a power portion performing PWM control on a voltage command to a motor for each set time period, converting direct-current power into alternating-current power, and outputting the same, a voltage command generation portion generating a voltage command in synchronization with a period N-times (N≧1) longer than the time period, an interval determination portion generating an interval determination signal which is ON during a half period of the time period and OFF during the next half period, a current detection portion detecting the current of the motor at timing of change in the interval determination signal, and a voltage correction portion generating a voltage correction value such that the amount of change in the detected current when the interval determination signal is ON becomes equal to the amount of change in the detected current when it is OFF and correcting the voltage command.