US 9,812,947 B2
Motor control device having life prediction unit of smoothing capacitor
Kenta Yamamoto, Yamanashi (JP); and Tadashi Okita, Yamanashi (JP)
Assigned to FANUC CORPORATION, Yamanashi (JP)
Filed by FANUC CORPORATION, Yamanashi (JP)
Filed on Mar. 23, 2016, as Appl. No. 15/78,078.
Claims priority of application No. 2015-090832 (JP), filed on Apr. 27, 2015.
Prior Publication US 2016/0315575 A1, Oct. 27, 2016
Int. Cl. G01R 23/09 (2006.01); H02M 1/32 (2007.01); G01R 31/00 (2006.01); H02P 27/06 (2006.01); H02M 5/458 (2006.01)
CPC H02M 1/32 (2013.01) [G01R 31/00 (2013.01); H02M 5/4585 (2013.01); H02P 27/06 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A motor control device comprising:
a converter that converts AC power supplied from a side of an AC power source into DC power;
a smoothing capacitor provided in a DC link on a DC side of the converter;
an inverter that performs mutual power conversion between the DC power in the DC link and AC power that is driving power or regenerative power of a motor;
a capacitor capacity measurement unit that measures a capacity of the smoothing capacitor, on the basis of the DC voltage applied to the smoothing capacitor at a point after an initial charging operation is complete;
a data record unit that records a plurality of pieces of data composed of a measurement value of the capacity of the smoothing capacitor measured by the capacitor capacity measurement unit and a date or both a date and time when the measurement has been performed;
a deterioration characteristic calculation unit that calculates a deterioration characteristic line indicating a change of the capacity of the smoothing capacitor with respect to elapsed time, on the basis of the plurality of pieces of data recorded in the data record unit; and
a life prediction unit that predicts a period when a life of the smoothing capacitor ends, on the basis of the deterioration characteristic line calculated by the deterioration characteristic calculation unit.