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. 10, 2013
Filed:
Jun. 29, 2011
Satoshi Sumita, Hitachi, JP;
Kazuaki Tobari, Hitachiota, JP;
Daisuke Maeda, Hitachinaka, JP;
Yasuo Notohara, Hitachiota, JP;
Satoshi Sumita, Hitachi, JP;
Kazuaki Tobari, Hitachiota, JP;
Daisuke Maeda, Hitachinaka, JP;
Yasuo Notohara, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A control apparatus and a control method for an AC electric motor detect DC bus current plural times at predetermined intervals during first and second predetermined periods and multiply vectors having integrated values of detected values during respective periods as elements by an inverse matrix of a matrix having integrated values during respective periods of sine and cosine functions of output voltage phase of an inverter at the moment that detection is made as elements to thereby estimate reactive and active currents.