Resolver-to-Digital Conversion Based on Error-Based Active Disturbance Rejection PLL

The accuracy of rotor position detection is crucial for the performance of motor drive systems. To reduce the volume and cost of motor inverters, software-based resolver-to-digital converter (RDC) systems have been widely used. The traditional RDC system uses the PI controller to converge the angle error. However, when faced with the problem of phase errors caused by motor acceleration and deceleration, there is a steady-state error in estimating the rotor position. To address this problem, this paper proposes a modified SRF-PLL framework that replaces the PI controller with error-based active disturbance rejection control. By treating the derivative of the rotor position signal as a disturbance, the proposed system offers stronger anti-disturbance capabilities and faster response. This improvement enhances position accuracy and boosts system robustness in dynamic operating conditions. Experimental results show that the modified system provides more precise rotor position tracking during acceleration compared to traditional PI-based systems. This improvement significantly boosts the accuracy of rotor angle measurement and optimizes motor drive system performance.