Vibration control device and vibration control method
AssigneeOkuma Corporation
InventorMasashi MIYAJI
Life of this patent
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Abstract
There are disclosed a vibration control device and a vibration control method that control shaft torsional vibration and machine stand vibration without installing a special sensor or measurement instrument. A vibration control device includes an amplification factor change unit that changes an amplification factor of an amplification unit used for amplifying a deviation between a command value and a detection value in a servo amplifier, a vibration detection unit that measures the frequency and the amplitude of vibration superimposed on a moving part, and a filter change unit that changes a filter based on the frequency and the amplitude detected by the vibration detection unit.
Claims4
A vibration control device for controlling vibration of a moving part in a machine, the machine comprising:
- the moving part that is driven by a servo motor;
- a numerical control device that generates a movement command for the moving part;
- a filter that shapes the command generated by the numerical control device and limits frequencies to be passed;
- a detector that detects a position or a speed of the moving part;
- and
- a servo amplifier that controls a force generated by the servo motor or a force transmitted to the moving part such that a deviation between an output from the filter and a detection value detected by the detector becomes 0, wherein
- the vibration control device comprises
- an amplification factor change unit that changes an amplification factor of an amplification unit used for amplifying the deviation in the servo amplifier,
- a vibration detection unit that measures, from the deviation, the frequency and the amplitude of vibration superimposed on the moving part, and
- a filter change unit that changes the filter based on the frequency and the amplitude detected by the vibration detection unit.
A vibration control method for controlling vibration of a moving part in a machine, the machine comprising:
- the moving part that is driven by a servo motor;
- a numerical control device that generates a movement command for the moving part;
- a filter that shapes the command generated by the numerical control device and limits frequencies to be passed;
- a detector that detects a position or a speed of the moving part;
- and
- a servo amplifier that controls a force generated by the servo motor or a force transmitted to the moving part such that a deviation between an output from the filter and a detection value detected by the detector becomes 0, wherein the vibration control method comprises the steps of
- reducing an amplification factor of an amplification unit used for amplifying the deviation in the servo amplifier,
- measuring the frequency and the amplitude of vibration superimposed on the moving part,
- reducing, when the amplitude of the vibration exceeds a predetermined amplitude, the gain of the filter at the frequency of the vibration by at least the ratio of the amplitude of the vibration to the predetermined amplitude, and
- returning the amplification factor of the amplification unit used for amplifying the deviation to an original amplification factor.
Dependencies are inferred from the claim text.