Pasala Gopi This email address is being protected from spambots. You need JavaScript enabled to view it.1 and K. Harinath Reddy1
1Department of Electrical and Electronics Engineering, Annamacharya Institute of Technology and Sciences, Rajampet, Andhra Pradesh
Received: December 22, 2020 Accepted: March 28, 2021 Publication Date: June 22, 2021
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
This research paper focuses on the mathematical model of DC motor drive fed from the 3-Ph converter and the design of the PI speed controller for its speed control. To evaluate the gain coefficients of the PI speed controller, Symmetrical Optimum criteria are proposed. The proposed criterion is easier to understand than other advanced control methods. Using this criterion the gains of the PI controller are obtained by developing the mathematical model of the DC motor drive. This controller can be easily implemented for real-time applications of keeping motor speed at any desired set-point speed under varying operating conditions. The speed performance using the proposed method was compared with the S-curve method in MATLAB. The simulation results, with constant operating speed, indicate that the proposed criterion provides superior speed performance than the S-curve method. A similar speed response can be obtained with the selected PI gains for variable speeds. Finally, a comparative study has been done to highlight the proposed method benefits.
Keywords: Symmetrical Optimum Criteria; DC motor drive; Converter; PI Controller
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