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. 06, 2022
Filed:
May. 29, 2019
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Kazuaki Tobari, Tokyo, JP;
Yoshitaka Iwaji, Tokyo, JP;
Agnes Hadinata, Tokyo, JP;
Yusaku Onuma, Tokyo, JP;
Takuya Sugimoto, Tokyo, JP;
Atsuhiko Nakamura, Tokyo, JP;
Hiroshi Watanabe, Tokyo, JP;
Yoshiyuki Taguchi, Tokyo, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
A power conversion device includes a harmonic voltage generation unit that superimposes dc-axis and qc-axis harmonic voltages on dc-axis and qc-axis voltage commands in accordance with a switching signal; and an inductance estimation unit that estimates dc-axis inductance and qc-axis inductance on a basis of dc-axis and qc-axis harmonic currents, amplitude values of the harmonic voltages, and the switching signal.