Motor control apparatus having a function of determining start of machine protecting operation
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United States of America Patent
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Jan 2, 2018
Issued Date -
N/A
app pub date -
Sep 11, 2015
filing date -
Sep 19, 2014
priority date (Note) -
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Abstract
A motor control apparatus includes: a rectifier converting AC power into DC power; a smoothing capacitor provided for a DC link; an inverter connected to the DC link and mutually converts power between DC power and AC power; an AC voltage detector detecting voltage of a power supply; a voltage amplitude calculator converting the AC voltage value into a power supply voltage amplitude value; a power failure detector detecting a state of power failure when the power supply voltage amplitude value has continued to be equal to or lower than a first threshold for a predetermined period; a DC voltage detector detecting the DC voltage of the smoothing capacitor; and, a protecting operation start determining unit notifying the inverter of the actuation of axis stoppage or axis retraction when a power failure is detected and when the DC voltage value is equal to or lower than a second threshold.
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