An On-Line Self-Calibration Method for DSP-Based Resolver-to-Digital Converters
Peng Zeng, Yao Sun, Feng Zhou, Hanbing Dan, Xing Li, Patrick William Wheeler, Marco E. Rivera · IEEE Transactions on Power Electronics · 2025
In software-based resolver-to-digital converters (RDCs), parameter deviations of detected envelope signals (amplitude imbalance, DC offset, and non-orthogonal phase shifts) can introduce periodic rotor position estimation errors, leading to significant degradation of control performance of a permanent magnet synchronous machine (PMSM). To address this issue, an on-line self-calibration method is proposed in the study. First, a self-calibration framework based on certainty equivalence principle is designed, and the effect of resolver parameter deviations on the harmonic components of envelope signals is analyzed. Then, the correlated harmonic components are separated to estimate parameter deviations. The rotor position estimation error is self-calibrated in the parameter deviations estimation process. Finally, the effectiveness of the proposed method is verified by simulation and experimental results.