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:
Jan. 31, 2012
Filed:
Jun. 23, 2009
Sadayuki Sato, Kitakyushu, JP;
Hideaki Iura, Kitakyushu, JP;
Yoichi Yamamoto, Kitakyushu, JP;
Kozo Ide, Kitakyushu, JP;
Sadayuki Sato, Kitakyushu, JP;
Hideaki Iura, Kitakyushu, JP;
Yoichi Yamamoto, Kitakyushu, JP;
Kozo Ide, Kitakyushu, JP;
Kabushiki Kaisha Yaskawa Denki, Fukuoka, JP;
Abstract
A control device includes a slip calculator that calculates a first slip frequency of an induction motor, a current detector that detects motor current that passes through the induction motor, an adder that calculates a primary frequency by adding a speed command and a second slip frequency that are given, a command voltage generation unit that generates first command voltage from the primary frequency, a voltage error observer unit that estimates a command voltage error from the first command voltage and the motor current, a slip correction unit that calculates a slip correction amount from the command voltage error, an adder that calculates the second slip frequency by adding the first slip frequency and the slip correction amount, and a voltage error correction unit that corrects the first command voltage using the command voltage error and outputs second command voltage.