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:
Jul. 31, 2012
Filed:
Nov. 14, 2008
Shigeyuki Yoshihara, Hitachinaka, JP;
Hirokazu Matsui, Hitachiohta, JP;
Kohei Myoen, Hitachinaka, JP;
Toshisada Mitsui, Matsumoto, JP;
Shigeyuki Yoshihara, Hitachinaka, JP;
Hirokazu Matsui, Hitachiohta, JP;
Kohei Myoen, Hitachinaka, JP;
Toshisada Mitsui, Matsumoto, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a motor control apparatus that can perform an abnormality diagnosis of current sensors and achieve cost reduction. When the outputs from three current sensors, which detect individual phase currents of a 3-phase AC current supplied from an inverter to a 3-phase AC motor, indicate that the sum of the individual phase currents of the 3-phase AC current is greater than a predetermined value, a sensor abnormality judgment unit of a motor control unit judges that one of the three current sensors is abnormal. The sensor abnormality judgment unit identifies an abnormal current sensor, which is one of the three current sensors, and performs calculations in accordance with the remaining two normal current sensors to output the current in the phase detected by the abnormal current sensor.