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:
Sep. 18, 2012
Filed:
Mar. 19, 2009
Eiichiro Hashimoto, Kyoto, JP;
Yoshio Tomigashi, Hirakata, JP;
Eiichiro Hashimoto, Kyoto, JP;
Yoshio Tomigashi, Hirakata, JP;
SANYO Electric Co., Ltd., Moriguchi-Shi, JP;
Abstract
To prevent a step-out of a permanent magnet synchronous type motor (), a motor control device () is provided to include a flux control unit () for deriving an excitation current command value (iγ*) according to the rotation speed (ω) of the motor, and a voltage shortage determination unit () for determining whether or not the supply voltage to the motor is running short based on the excitation current command value (iγ*). When a negative excitation current command value (iγ*) is smaller than a negative determination threshold value, the motor control device determines that the supply voltage is running short and prohibits an increase of the rotation speed or decreases the rotation speed.