小波变换在伺服驱动器相电流信号处理中的应用研究

Application of wavelet transform in the processing of phase current signal of servo driver

本文以大功率机电伺服系统为研究背景,通过研究小波变换特性,选取适合伺服驱动器电流信号处理的Symlets小波,在某固体火箭发动机柔性喷管负载条件下进行典型伺服系统特性试验,对实测相电流信号进行小波去噪。对不同工作状态下相电流信号进行小波分解和去噪处理,以信噪比、均方误差为衡量标准,比较了采用不同去噪方法时相电流信号的去噪效果。

With the background of high-power machine-electrical servo system, after investigating the characteristics of wavelet trans- form, Symlets wavelet is selected for processing the current signal in the servo driver. Under the typical servo system experiment of certain solid rocket, phase current is gathered as the wavelet-denoising object. Then the phase current of different condition is de- noised using wavelet method, SNR and MSE are the two criteria for estimating the effect of different wavelet-denoising-methods.