CAJ | 학술논문

推导出在高次谐波干扰下,PARK矢量模平方函数的数学表达式,消除直接进行定子电流分析时基波频率对特征频率的影响。但是新增的频率成分很容易被直流分量、2f分量和4f分量淹没,对PARK矢量模平方函数进行傅立叶变换效果很差。采用多分辨率小波分析,对其各层系数进行分解与重构,其中第7层高频系数和第8层高频系数重构后的波形在发生故障时幅值明显大于无故障时的波形,对电机故障有很高的辨识度,是一种有效的方法。
추도출재고차해파간우하,PARK시량모평방함수적수학표체식,소제직접진행정자전류분석시기파빈솔대특정빈솔적영향。단시신증적빈솔성분흔용역피직류분량、2f분량화4f분량엄몰,대PARK시량모평방함수진행부립협변환효과흔차。채용다분변솔소파분석,대기각층계수진행분해여중구,기중제7층고빈계수화제8층고빈계수중구후적파형재발생고장시폭치명현대우무고장시적파형,대전궤고장유흔고적변식도,시일충유효적방법。
Square function of the park’s vector modulus under high-order harmonic is given,and it can eliminate the impact of fundamental frequency on characteristic frequency of directly analyzing stator current.But the new frequency components can be cubmerged easily by DC component,2f component and 4f component,and the efficiency of Fourier transform of the the park’s vector modulus square function is low.With multiresolution wavelet analysis,the wavelet coefficients are decomposed and reconstructed.The waveform reconstructed by the high frequency coefficients of layer seven and the high frequency coefficients of layer eight has larger amplitude when the motor is fault,the fault motor is easy to recognise.It is an effective method.