NUMERICAL CONTROL DEVICE HAVING FUNCTION OF CALCULATING FREQUENCY CHARACTERISTIC OF CONTROL LOOP

摘要

A numerical control device wherein a sinusoidal signal generated by a sine wave generation part is input by a control loop excitation part to a control loop of the control object, the input signal input to the control loop and the output signal from the control object are sampled by the data acquisition part periodically, and the sampling data is used by the frequency characteristic calculation part to calculate the frequency characteristic of the control loop to control the control object, wherein the frequency characteristic calculation part uses data obtained by inputting a sinusoidal signal obtained by shifting an initial phase of the sinusoidal signal by a phase shift part provided at a sine wave generation part by exactly a certain amount to the control loop a plurality of times to calculate the frequency characteristic of the control loop to thereby improve the measurement precision regardless of the sampling frequency.

主权项

1. A numerical control device which controls at least one control object, comprising:
a sine wave generation part which generates a sinusoidal signal; a control loop excitation part which inputs a sinusoidal signal which is output from said sine wave generation part to a control loop of said control object; a data acquisition part which samples an input signal which is input to said control loop and an output signal which said control object outputs at a certain period; a frequency characteristic calculation part which uses the sampling data of the input signal and output signal to calculate the frequency characteristic of said control loop; and a phase shift part which shifts the phase of said sinusoidal signal, wherein the numerical control device uses data obtained by inputting a sinusoidal signal having a predetermined phase as an initial phase and a sinusoidal signal having the initial phase shifted by exactly a certain amount to said control loop a plurality of times to enable said frequency characteristic calculation part to calculate the frequency characteristic of said control loop.