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:
Nov. 30, 2010
Filed:
Jul. 11, 2006
Hideaki Iura, Kitakyushu, JP;
Masanobu Inazumi, Kitakyushu, JP;
Hideaki Iura, Kitakyushu, JP;
Masanobu Inazumi, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
This invention provides an inverter device that can detect a step-out state of an AC motor by a simple process without depending on a rotation speed of the AC motor and also surely hold an abnormal state in the step-out state of the AC motor. The inverter deviceincludes a torque current control unitfor controlling a torque current direction voltage so that a given torque current command value coincides with a torque current detection value, and a V/f conversion unitfor calculating an induced voltage command of the AC motorbased on a given output frequency command. The inverter device further includes a step-out detection unitfor detecting a step-out state of the AC motorbased on the torque current direction voltage and the induced voltage command.