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:
Dec. 20, 2011
Filed:
Apr. 11, 2007
Tomohiro Miura, Maebashi, JP;
Masahiro Maeda, Maebashi, JP;
Yousuke Imamura, Maebashi, JP;
Lilit Kovudhikulrungsri, Maebashi, JP;
Tomohiro Miura, Maebashi, JP;
Masahiro Maeda, Maebashi, JP;
Yousuke Imamura, Maebashi, JP;
Lilit Kovudhikulrungsri, Maebashi, JP;
NSK, Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a motor control device capable of suppressing voltage composite vector fluctuation to increase the output of a brushless motor, and a motor-driven power steering system using this device. The present control device calculates motor phase current command values based on a target current and a rotor rotational position detection value, calculates voltage command values based on the motor phase current command values and phase current detection values, and supplies phase currents to a three-phase brushless motor based on the voltage command values. The present control device outputs the phase current command values so that the absolute value of a composite vector of respective phase drive voltages is substantially a value √3/2 times the power supply voltage.