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:
Feb. 23, 2021
Filed:
Jul. 31, 2019
Toshiba Mitsubishi-electric Industrial Systems Corporation, Chuo-ku, JP;
Fumio Watanabe, Tokyo, JP;
Masashi Nakamura, Tokyo, JP;
Abstract
A drive control unit that performs vector control of a synchronous motor determines reference phase angles of 3-phase/DQ converters, and a DQ/3-phase converter. When speed of a synchronous motor is equal to or higher than a predetermined threshold value, the reference phase angle is obtained by adding a correction angle such that D-axis voltage feedback output from 3-phase/DQ converter becomes zero to the detection angle of a position detector. And when the speed of the synchronous motor is less than a predetermined threshold value, the reference phase angle is obtained by adding a low speed load angle set in advance to the detection angle of the position detector. In a vector control operation, a power factor is achieved by controlling the D-axis current to be zero.