data of Control of PMSM via a Fusion of Fractional-Order Repetitive Control and Equivalent Input Disturbance Compensation

Abstract\u2014To enhance the suppression of both periodic torque ripple and aperiodic disturbances in the sensorless control of interior permanent magnet synchronous motors (IPMSMs), a composite control strategy integrating fractional-order repetitive control (FRC) and equivalent input disturbance (EID) compensation is proposed. A tunable fractional-order delay, constructed using Lagrange interpolation, is incorporated to achieve accurate frequency alignment with the motor's fundamental component, effectively addressing the frequency mismatch issue inherent in conventional repetitive control under variable-speed operation. Additionally, an EID-based observer is designed to estimate and compensate for aperiodic disturbances in real time, significantly improving system robustness. Simulation and experimental results validate the effectiveness of the proposed method, showing a reduction in torque ripple amplitude from 1.85 Nm to 0.45 Nm (approximately 75.7%), a decrease in total harmonic distortion (THD) of the stator current from 6.69% to 1.33%, and a 38.4% improvement in position estimation accuracy. The proposed strategy ensures stable and high-performance operation across the entire speed range, providing a robust and efficient sensorless control solution for electric vehicle drive applications.