Use of fractal analysis for quality evaluation of control methods in induction motor drive systems

This paper presents a new quality evaluation method of control assessments used nowadays for induction motor drives systems. To visualize the accuracy of the new evaluation method, a comparative analysis is performed between this new method and the method widely used in modern drive systems, respectively, the spectral analysis method. By determining the fractal dimension of temporal variation of the quantities of interest, specific to electrical and mechanical access gates, which represents the proposed method, the established hierarchy was validated, for these assessments, hierarchy obtained using the spectral analysis method. The variation of the quantities of interest on the two access gates, electrical and mechanical, was obtained by simulation in PSIM (including the corresponding frequency spectrum), and the determination of the fractal size was performed in MATLAB.