Numerical controlling unit
OwnerJun Fujita, Minoru Hamamura +1inventors
InventorsJun Fujita, Minoru Hamamura, Sadaji Hayama
Life of this patent
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Abstract
The invention relates to a numerical controlling unit 10 having a speed-feedback controlling system. A peak-frequency detector 20 determines a peak frequency from a characteristic of a frequency transfer function whose input is a speed-instruction input signal and whose output is a speed feedback signal. A band elimination component 30 conducts a band elimination process to the speed-instruction input signal, based on the peak frequency.
Claims15
A numerical controlling unit having a speed-feedback controlling system comprising;
- a peak-frequency detector that can determine a peak frequency from a frequency transfer function whose input is a speed-instruction input signal and whose output is a speed feedback signal, and
- a band elimination component that can conduct a band elimination process to the speed-instruction input signal, based on the peak frequency.
A numerical controlling unit having a speed-feedback controlling system comprising;
- a peak-frequency detector that can determine a peak frequency from a frequency transfer function whose input is a speed-instruction input signal and whose output is a speed feedback signal, and
- a band elimination component that can conduct a band elimination process to the speed-instruction input signal that has been fused with the speed feedback signal, based on the peak frequency.
A method of using a numerical controlling unit that has a speed-feedback controlling system, the numerical controlling unit including
- a peak-frequency detector that can determine a peak frequency from a frequency transfer function whose input is a speed-instruction input signal and whose output is a speed feedback signal, and
- a band elimination component that can conduct a band elimination process to the speed-instruction input signal, based on the peak frequency,
- wherein
- the peak-frequency detector includes:
- a white-noise generator that can generate a white-noise input signal,
- a switch that can change the speed-instruction input signal into the white-noise input signal generated by the white-noise generator, and
- an FFT processing component that can determine a gain characteristic of the frequency transfer function whose input is the white-noise input signal and whose output is the speed feedback signal and that can determine the peak frequency,
- the band elimination component includes:
- a band elimination filter that can conduct the band elimination process according to set filter-parameter, and
- a parameter changing component that can change the filter-parameter for the band elimination filter, based on the peak frequency, and
- the filter-parameter for the band elimination filter can be set such that the band elimination process is ineffectual, the method comprising the steps of:
- causing the switch to change the speed-instruction input signal into the white-noise input signal generated by the white-noise generator,
- setting filter-parameter such that the band elimination process is ineffectual, for the band elimination filter,
- causing the white-noise generator to output the white-noise input signal,
- causing the FFT processing component to determine the gain characteristic of the frequency transfer function whose input is the white-noise input signal and whose output is the speed feedback signal, and to determine the peak frequency,
- causing the parameter changing component to change the filter-parameter for the band elimination filter, based on the determined peak frequency,
- causing the white-noise generator to stop outputting the white-noise input signal, and
- causing the switch to change back from the white-noise input signal into the original speed-instruction input signal.
Dependencies are inferred from the claim text.