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:
Aug. 05, 2008
Filed:
Mar. 24, 2004
Nobuo Itou, Tokyo, JP;
Keita Horii, Tokyo, JP;
Nobuo Itou, Tokyo, JP;
Keita Horii, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A control device for a permanent magnet synchronous motor includes: an inverterfor converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motorwith the AC voltage; a speed controllerfor generating, in accordance with a speed instruction signal, a q-axis current component orthogonal to the magnetic field of the motor; a loss calculating meansfor calculating a loss by summing a copper loss and an iron loss in the motor; a d-axis current generating meansfor generating, in accordance with the value that is the motor's rated loss decreased by the loss, a d-axis current instruction signal to flow into the motor; and a resistor-on-judgment unitfor judging, from the DC voltage, whether or not the motoroperates in its recovery state and activating the d-axis current generatorwhile in the recovery state.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile