No abstract

This paper is carrying out a practical identification of a DC servomotor from input and output data. The system's step response was obtained from an acquisition card that we have developed using a microcontroller. The data is collected and downloaded to the PC Thought RS232 Protocol to process the identification process using polynomial models (ARX, ARMAX, OE, and BJ). Afterward, a comparison between the resulting models has been made using the validation criterions R² and FPE. The results show that the ARMAX, OE, and BJ models have reproduced a better fit compared to the ARX model.