An Improved Position Self-Calibration Method Based on Multi-Harmonics Estimation for Resolver-to-Digital Conversion

TY - JOUR

T1 - An Improved Position Self-Calibration Method Based on Multi-Harmonics Estimation for Resolver-to-Digital Conversion

AU - Li, Jialin

AU - Chen, Zhen

AU - Hu, Hengzai

AU - Guo, Chaoyong

AU - Zhang, Qiang

AU - Guo, Youguang

N1 - Publisher Copyright: © 2025 The Author(s). IET Power Electronics published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.

PY - 2025/1/1

Y1 - 2025/1/1

N2 - The position self-calibration strategy is beneficial in decreasing the position deviation of the resolver-to-digital conversion (RDC), thereby improving the pointing accuracy of the servo system applied to the satellite optical payload. However, existing self-calibration methods primarily focus on the second harmonic caused by a single non-ideal factor, neglecting the fundamental and higher order harmonics in the typical position deviation resulting from the coupling of multiple factors. To address this issue, an improved position self-calibration method based on multi-harmonics estimation for the RDC is proposed in this paper. First, the position deviation model under multi-factors coupling is established. Second, the speed deviation caused by the position deviation and its integral signal is estimated by the speed observer. The integral signal is input into the multi-harmonics observer, simultaneously estimating the DC, fundamental and higher-order harmonics components, while also analysing the convergence conditions of the observers. Finally, the position deviation is estimated by combining the estimations of harmonics, and the compensation lookup table of the position deviation is established. Simulation and experimental results show that the calibrated deviation is reduced by 89.4% relative to the original deviation. Compared with a comparable method, the proposed method improves calibration accuracy by 27%.

AB - The position self-calibration strategy is beneficial in decreasing the position deviation of the resolver-to-digital conversion (RDC), thereby improving the pointing accuracy of the servo system applied to the satellite optical payload. However, existing self-calibration methods primarily focus on the second harmonic caused by a single non-ideal factor, neglecting the fundamental and higher order harmonics in the typical position deviation resulting from the coupling of multiple factors. To address this issue, an improved position self-calibration method based on multi-harmonics estimation for the RDC is proposed in this paper. First, the position deviation model under multi-factors coupling is established. Second, the speed deviation caused by the position deviation and its integral signal is estimated by the speed observer. The integral signal is input into the multi-harmonics observer, simultaneously estimating the DC, fundamental and higher-order harmonics components, while also analysing the convergence conditions of the observers. Finally, the position deviation is estimated by combining the estimations of harmonics, and the compensation lookup table of the position deviation is established. Simulation and experimental results show that the calibrated deviation is reduced by 89.4% relative to the original deviation. Compared with a comparable method, the proposed method improves calibration accuracy by 27%.

KW - calibration

KW - harmonics suppression

KW - observers

KW - sensors

UR - https://www.scopus.com/pages/publications/105019326638

U2 - 10.1049/pel2.70139

DO - 10.1049/pel2.70139

M3 - Article

AN - SCOPUS:105019326638

SN - 1755-4535

VL - 18

JO - IET Power Electronics

JF - IET Power Electronics

IS - 1

M1 - e70139

ER -