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:
Nov. 13, 2012
Filed:
Feb. 26, 2010
Applicants:
Michisada Yabuguchi, Kasugai, JP;
Shinichi Kuratani, Kasugai, JP;
Takenobu Nakamura, Kani, JP;
Inventors:
Assignee:
OMRON Corporation, Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 7/085 (2006.01); H02P 27/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A motor drive device has a drive unit for driving a motor based on an ON/OF operation of a switching element by a PWM (Pulse Width Modulation) signal. The motor drive device uses a PWM control method and performs abnormal determination based on an application voltage value and an actual measurement voltage value of the motor. The motor drive device does not make a false determination of determining as abnormal when it is normal, when determining the presence of abnormality based on the application voltage value and the actual measurement voltage value of the motor.