Frequency characteristic measuring method at feed axis control unit
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United States of America Patent
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May 12, 2020
Grant Date -
Oct 12, 2017
app pub date -
Feb 23, 2017
filing date -
Apr 8, 2016
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Abstract
A method measures a frequency characteristic at a feed axis control unit configured to drive a motor in accordance with a velocity command value to control a velocity or a position of a movable portion of a driven body. The velocity command value includes a velocity reference value from a host device or a velocity command calculator and a sweep signal swept in order to measure the frequency characteristic. The method includes moving the feed axis in one direction by commanding the velocity reference value where a moving velocity of the feed axis is constant, exciting by providing a sine wave having an amplitude less than a magnitude of the velocity reference value to the sweep signal, and measuring the frequency characteristic of a feed axis drive system including the motor.
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