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:
May. 24, 2016
Filed:
Oct. 22, 2012
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Toshifumi Sakai, Tokyo, JP;
Koichiro Nagata, Tokyo, JP;
Yoshitaka Iwaji, Tokyo, JP;
Motomi Shimada, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a system for driving an electric motor by an engine generator, there is a possibility that oscillation and d-axis current are increased. In an engine generator system, a power converter () controls a generator () so that the phase of an oscillating component included in the d-axis current in the rotor magnetic flux direction of the generator () advances by 90 degrees or more with respect to the phase of an oscillating component of the identical frequency included in the rotating electric angular frequency of the generator (), and further using q-axis voltage adjusting device () so that the phase of an oscillating component included in the q-axis current advances by 90 degrees or more with respect to the phase of an oscillating component of the identical frequency included in the rotating electric angular frequency of the generator ().