Sinusoidal signal generation method and device, equipment and medium

Abstract

The invention discloses a sinusoidal signal generation method and device, equipment and a medium, and the method comprises: calling a preset sinusoidal signal stored in advance from a sinusoidal signal generator when a triggering instruction of a servo driver for obtaining a target sinusoidal signal is received, wherein the preset sinusoidal signal only records a sinusoidal function value corresponding to each sampling point in a 1 / 4 sampling period; judging whether the target sampling frequency of the target sinusoidal signal is greater than or equal to the preset sampling frequency of the preset sinusoidal signal; if yes, uniformly sampling the sampling points of the preset sinusoidal signal to obtain a target sinusoidal signal; and if not, performing uniform interpolation between two adjacent sampling points of the preset sinusoidal signal by using the Taylor series to obtain a target sinusoidal signal, and sending the target sinusoidal signal to the servo driver. The method not only can reduce the occupation of the storage space of the sinusoidal signal generator, but also can improve the precision and speed of outputting the sinusoidal signal.

Description

technical field [0001] The present invention relates to the technical field of digital signals, in particular to a method, device, equipment and medium for generating sinusoidal signals. Background technique [0002] At present, the servo drive generally uses sinusoidal signals to trigger the movement of the servo motor. Since the servo drive itself cannot generate sinusoidal signals, the servo drive usually obtains the sinusoidal signal from the sinusoidal signal generator to trigger the movement of the servo motor. In the prior art, if the sinusoidal signal generator is desired to output a sinusoidal signal of a specific frequency, it is usually necessary to store a corresponding calculation program in the sinusoidal signal generator. The commonly used sinusoidal signal generation methods of sinusoidal signal generators mainly include look-up table method, Taylor series expansion method and iteration method. [0003] Among them, the table look-up method is to store the si...

AI Technical Summary

Problems solved by technology

Although this method has the advantages of fast output of sinusoidal signals and high precision, this method requires a large amount of storage space for the sinusoidal signal generator

The Taylor series expansion method is to approximate the real sinusoidal signal by expanding the Taylor series polynomial to output a sinusoidal signal of a specific frequency. However, this method requires a long calculation time and cannot meet the real-time requirements of the output signal.

The iterative method uses the recursive formula to calculate the sinusoidal function value of a specific sampling frequency sinusoidal signal at each sampling point. Since this method will generate a large amount of error accumulation in the recursive process, the iterative method cannot achieve Requirements for output accuracy of sinusoidal signals

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