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. 06, 2018
Filed:
Aug. 18, 2016
Fanuc Corporation, Yamanashi, JP;
FANUC CORPORATION, Yamanashi, JP;
Abstract
A motor drive apparatus comprises: a converter which converts DC power into AC power and returns the AC power to an AC power supply; a 120-degree conduction regenerative power control unit which controls the converter using a 120-degree conduction method so that the power recovered through the converter is returned to the AC power supply; a PWM regenerative power control unit which controls the converter using a PWM control method so that the power is returned to the AC power supply; an input voltage detection unit which detects a supply voltage supplied to the converter; a DC link voltage detection unit which detects a DC link voltage; and a regenerative method switching unit which, during power regeneration, performs switching between the 120-degree conduction method and the PWM control method in accordance with a given criterion, based on a voltage value detected by the DC link voltage detection unit.