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:
Dec. 08, 2015
Filed:
Aug. 13, 2014
Denso Corporation, Kariya, Aichi-pref., JP;
Ryuji Omata, Anjo, JP;
Takahumi Oowada, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A control device of a three-phase AC motor includes: an inverter; a current sensor for a sensor phase current; and a controller switching a switching element of each phase of the inverter and having a current estimation device, which calculates a sensor-phase-standard current phase according to α and β axis currents and a current estimated value of another phase. The current estimation device calculates the α axis current at every switching and intermediate timings, calculates a first differential value of the α axis current at every switch timing, calculates the β axis current according to the first differential value, calculates a second differential value of the α axis current at every intermediate timing, and calculates the β axis current according to the second differential value. The intermediate timing is set to have an unequal interval between two adjacent switch timings.