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:
May. 12, 2020
Filed:
Jan. 31, 2019
Fanuc Corporation, Yamanashi, JP;
Shinichi Horikoshi, Yamanashi, JP;
Yuuya Nakagawa, Yamanashi, JP;
FANUC CORPORATION, Yamanashi, JP;
Abstract
A motor drive apparatus includes a PWM converter configured to convert AC power of an AC power supply into DC power, a DC link unit including capacitors provided on the DC output side of the PWM converter and connected in series with each other, an inverter configured to convert the DC power of the DC link unit into AC power for driving a motor and output the AC power, a DC link voltage detection unit, a power supply voltage detection unit, a short-circuit judgment unit configured to judge that at least one of the capacitors has shorted when the DC link voltage value is smaller than the peak value of the power supply voltage, and a shut-off unit configured to shut off flow of AC power from the AC power supply into the PWM converter when the short-circuit judgment unit judges that at least one of the capacitors has shorted.