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. 07, 2010
Filed:
Sep. 23, 2008
Shigeki Nagase, Nabari, JP;
Takeshi Ueda, Kashiba, JP;
Ken Matsubara, Matsubara, JP;
Toshiaki Oya, Sakai, JP;
Yasuyuki Yoshii, Souraku-gun, JP;
Shigeki Nagase, Nabari, JP;
Takeshi Ueda, Kashiba, JP;
Ken Matsubara, Matsubara, JP;
Toshiaki Oya, Sakai, JP;
Yasuyuki Yoshii, Souraku-gun, JP;
JTEKT Corporation, Osaka-shi, JP;
Abstract
A current sensor of a motor controller detects the current applied to a motor drive circuit and thus a phase where a failure cannot be detected would occur without taking any measures. However, an abnormal current monitor section contained in a microcomputer receives a voltage signal of an average value of the currents detected in the current sensor by allowing a signal to pass through a first LPF having a cutoff frequency sufficiently lower than the frequency of a PWM signal. Therefore, whether or not the value is within a predetermined normal range is checked, whereby whether or not some failure containing a failure of the current sensor occurs can be easily determined about every phase.