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 |
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.
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