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:
Oct. 23, 2012
Filed:
Jun. 30, 2011
Tadashi Okita, Minamitsuru-gun, JP;
Takahiro Akiyama, Minamitsuru-gun, JP;
Tomohisa Tsutsumi, Minamitsuru-gun, JP;
Tadashi Okita, Minamitsuru-gun, JP;
Takahiro Akiyama, Minamitsuru-gun, JP;
Tomohisa Tsutsumi, Minamitsuru-gun, JP;
Fanuc Corporation, Minamitsuru-gun, Yamanashi, JP;
Abstract
A sensorless induction motor control device with a function of correcting a slip frequency wherein a slip frequency estimation unit estimates the slip frequency from at least one kind of current flowing through the motor. A voltage command value calculation unit calculates a D-phase voltage command value and a Q-phase voltage command value which are used for controlling a voltage applied to the motor using a Q-phase current command value calculated based on a difference between a speed estimation value, which is calculated using an estimation value of the slip frequency, and an externally supplied speed command value. An ideal voltage command value determination unit determines an ideal voltage command value using the speed command value and the Q-phase current command value. An actual voltage command value calculation unit calculates an actual voltage command value using the D-phase voltage command value and the Q-phase voltage command value. and A slip frequency correction unit compares the ideal voltage command value with the actual voltage command value and changes the estimation value of the slip frequency to make it smaller if the actual voltage command value is smaller than the ideal voltage command value.