SRM Identification with Fractional Order Transfer Functions

The paper deals with the substantiation of the topicality of the problem of the creation of the high-quality and relatively simple control systems for electric drives with Switched reluctance motor (SRM) due to the continuous increase of the field of application of SRM in industry. The mathematical simulation method with the application of Matlab System Identification toolbox was used to determine that the sufficient convergence of the results can be obtained at the identification of SRM with a fractional rational transfer function having three zeros and four poles, R-squared value for this variant makes 86%. Such a high order of the transfer function of SRM causes the complexity of its regulator design. The authors worked out a method for the identification of SRM fractional measured transfer function based on the use of FOMCON MATLAB Toolbox. This approach provides higher accuracy of SRM identification. R-squared value for the proposed method makes 94 - 96%, which allows the simplification of the controller structure and the improvement of the accuracy of SRM control in the closed-loop control system. It is shown that the structure of the fractional measured transfer function, identifying the process of SRM start, does not depend on the electric drive inertia moment.