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. 26, 2004
Filed:
Dec. 16, 2002
Masaya Harakawa, Tokyo, JP;
Tetsuaki Nagano, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A speed control apparatus of an AC motor a first subtracter for finding toque component voltage saturation amount &Dgr;V from torque component voltage component V ′ output from a torque component current controller and torque component voltage command V * output from a torque component voltage limiter a first integrator for holding the torque component voltage saturation amount &Dgr;V , a magnetic flux command corrector for outputting magnetic flux command correction amount &Dgr;&phgr; from the held torque component voltage saturation amount &Dgr;V ′ and rotation angular speed &ohgr; to Cartesian two-axis coordinates, and a second subtracter for subtracting the magnetic flux command correction amount &Dgr;&phgr; from magnetic flux command &phgr; * and outputting magnetic flux correction command &phgr; * .