Patent attributes
Provided is a technology of enabling notification, to a user, that the state of a machine system has changed prior to occurrence of machine resonance, irrespective of the direction of a resonance frequency change. This servo driver is provided with: a servo control means for controlling a servo motor in accordance with a time-sequentially inputted command; a calculation means for time-sequentially collecting input data and output data for use in calculation of the frequency response of the servo control means while the servo control means is performing control, in accordance with a command for driving the servo motor itself, based on the command, and calculating a frequency response of the servo control means within a frequency range including a resonance peak, on the basis of the collected data; a specification means for specifying the gain of the resonance peak from the calculated frequency response; and an information output means for comparing the specified gain with a threshold lower than 0 dB, and outputting, when the gain is equal to or greater than the threshold, information for notifying, to a user, that the state of a machine system such as the servo motor has changed.
