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:
Oct. 10, 2017
Filed:
Aug. 12, 2014
Fuji Electric Co., Ltd., Kawasaki-shi, JP;
Akio Toba, Hino, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
When the current flowing through each electric terminal of an AC motorreaches the vicinity of zero, an operation putting the electric terminals of the AC motorinto an opened state, or putting an electric terminal into a conductive state via a reflux diode inside an inverter, is carried out. Herein, as an operation such that the current flowing through each electric terminal reaches the vicinity of zero, the electric terminals are short-circuited by all upper arm or lower arm switching elements of the inverterbeing turned on. By so doing, a flow of electromagnetic energy of a reactance component of the AC motor, from the AC motorinto the inverterside when the drive of the inverteris stopped, is prevented or suppressed. As a result of this, an overvoltage or overcurrent is prevented.