Open-Loop Sweep Based Multi-Frequency Motor Parameters Correction Method

The conventional controller tuning technique depends on plant parameters, hence the precision of plant parameter identification significantly impacts the stability margin and dynamic capability of the system. In recent years, numerous parameter identification approaches have been suggested for both online and offline applications combined with modern control theory or optimal control theory. Nevertheless, as a result of the system's non-linearity and unmodeled dynamics, certain identification procedures yield poor outcomes, resulting in a reduction in stability margin and degradation of the system's dynamic responsiveness. This article propose a parameter correction approach based on open-loop sweep that operates at many frequencies, The technique utilises the amplitude- and phase-frequency properties of open-loop transfer function to accurately identity delay constant in the high-frequency band and correct mismatch parameters in the middle- and low-frequency band. The simulation results demonstrate that this technique effectively corrects the mismatched motor parameters and enables the system to attain a suitable stability margin and dynamic capability.