University of Isfahan Computational Intelligence in Electrical Engineering 2821-0689 12 3 2021 09 23 Angular speed control in a hybrid stepper motor using linear matrix inequality Angular speed control in a hybrid stepper motor using linear matrix inequality 33 50 25342 10.22108/isee.2020.122029.1346 FA Farhad Amiri Ph.Dd student, Dept. of Electrical Engineering, Bu-Ali Sina University, Hamedan, Iran Mohammad Hassan Moradi Professor,Dept. of Electrical Engineering, Bu-Ali Sina University, Hamedan, Iran Journal Article 2020 03 06 Abstract: In this paper, a new control method based on the linear matrix inequality is used to control the speed of a hybrid stepper motor. The proposed method is proved based on the Lyapunov criterion. The proposed method has a higher degree of freedom than conventional robust controllers, which can be used to better control the system. The proposed method also exhibits high robustness against the uncertainty of the hybrid stepper motor parameters as well as the applied disturbances. Also in this method, the effect of rapid changes in the reference speed of the hybrid stepper motor are considered so that the controller can have more effective tracking. The proposed control method is compared with the Self-tuning PI controller and PI (Ziegler-Nichols) controller in multiple scenarios considering the uncertainty of the parameters and different disturbances. The obtained results indicate that the proposed controller has a better performance against the disturbances and uncertainty of the parameters in comparison with the abovementioned controllers. It should be noted that the simulations have been performed in Matlab. Abstract: In this paper, a new control method based on the linear matrix inequality is used to control the speed of a hybrid stepper motor. The proposed method is proved based on the Lyapunov criterion. The proposed method has a higher degree of freedom than conventional robust controllers, which can be used to better control the system. The proposed method also exhibits high robustness against the uncertainty of the hybrid stepper motor parameters as well as the applied disturbances. Also in this method, the effect of rapid changes in the reference speed of the hybrid stepper motor are considered so that the controller can have more effective tracking. The proposed control method is compared with the Self-tuning PI controller and PI (Ziegler-Nichols) controller in multiple scenarios considering the uncertainty of the parameters and different disturbances. The obtained results indicate that the proposed controller has a better performance against the disturbances and uncertainty of the parameters in comparison with the abovementioned controllers. It should be noted that the simulations have been performed in Matlab. https://isee.ui.ac.ir/article_25342_d39406a2dc1135eac4bd2558d2db320f.pdf