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:
Aug. 23, 2022
Filed:
Dec. 26, 2018
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Kazuaki Tobari, Tokyo, JP;
Yoshitaka Iwaji, Tokyo, JP;
Agnes Hadinata, Tokyo, JP;
Yusaku Onuma, Tokyo, JP;
Atsuhiko Nakamura, Tokyo, JP;
Takuya Sugimoto, Tokyo, JP;
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD., Tokyo, JP;
Abstract
A power conversion apparatus controls a load apparatus by position sensorless vector control. The power conversion apparatus includes: a current detection unit configured to detect a current passing through the load apparatus; a current detection arithmetic unit configured to calculate a harmonic current component on a dc-axis as a control axis and a harmonic current component on a qc-axis, based on the detected current; a saliency ratio estimation unit configured to output a saliency ratio estimated value based on the harmonic current component on the dc-axis and the harmonic current component on the qc-axis; and a saliency ratio control unit configured to output a current component that increases or decreases a current command value on a d-axis of a rotor coordinate system, based on a deviation between the saliency ratio estimated value and a predetermined saliency ratio.