Performance Analysis of Stepper Motor Speed Detection Using HMI and Oscilloscope

Abstract

This study investigates the accuracy of stepper motor speed measurements by comparing the theoretical speed calculated from control inputs with the speed displayed on a Human-Machine Interface (HMI). The methodology involves capturing the PWM signal driving the stepper motor using an oscilloscope, followed by mathematical calculations to derive the theoretical speed. Experimental results demonstrate that the measured speed from the oscilloscope closely aligns with the theoretical values displayed on the HMI, validating the system's ability to provide reliable speed data. Furthermore, the HMI speed values exhibit a linear increase, while the corresponding oscilloscope measurements maintain a proportional relationship, indicating proper system calibration. Minor deviations observed between the theoretical and measured speeds are attributed to system latency and measurement errors. These findings highlight the reliability of the system and its potential for precise speed control in automation applications.