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:
Apr. 14, 1998
Filed:
Aug. 01, 1996
Applicant:
Inventor:
Norihiko Akao, Nagoya, JP;
Assignee:
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02P / ; B60L / ;
U.S. Cl.
CPC ...
318139 ; 318434 ; 318439 ; 318811 ; 318490 ;
Abstract
A device and method for detecting a failure which are used with an AC motor control circuit to detect a failure in a total of three current sensors correlated to phases U, V, W of a motor. Three types of current paths are formed in order to position two current sensors on each current path while providing an adequate time interval so as not to rotate the motor. By comparing output from each current sensor with a reference value, or by comparing respective output from the two current sensors provided on the same current path, a failure in the respective current sensors is detected. The motor need not be driven in order to detect a fail in the current sensors.