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:
Jan. 25, 2022
Filed:
Jun. 21, 2017
Toshiba Mitsubishi-electric Industrial Systems Corporation, Chuo-ku, JP;
Yasuaki Matsumoto, Chuo-ku, JP;
Hiroshi Ogino, Chuo-ku, JP;
Hironori Kawaguchi, Chuo-ku, JP;
Akinobu Ando, Chuo-ku, JP;
Ryoji Miyatake, Chiyoda-ku, JP;
Michio Kataoka, Chiyoda-ku, JP;
Abstract
A thyristor starter is configured to accelerate a synchronous machine from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter by intermittently setting DC output current of a converter to zero and a second mode of performing commutation of the inverter by induced voltage of the synchronous machine. The thyristor starter is further configured to raise induced voltage in proportion to the rotation speed of the synchronous machine by keeping field current constant and to suppress rise of the induced voltage by reducing the field current after the induced voltage reaches a first voltage value, in the first mode.