TYPE-III RESOLVER-TO-DIGITAL CONVERTER USING SYNCHRONOUS DEMODULATION

RAYMUNDO  CORDERO GARCÍA; JOÃO  ONOFRE PEREIRA PINTO; EDSON  ANTONIO BATISTA; MARCIO  AFOSO SOLEIRA GRASSI

doi:10.20906/CBA2022/346

RAYMUNDO CORDERO GARCÍA Universidade Federal de Mato Grosso do Sul
JOÃO ONOFRE PEREIRA PINTO Universidade Federal de Mato Grosso do Sul
EDSON ANTONIO BATISTA Universidade Federal de Mato Grosso do Sul
MARCIO AFOSO SOLEIRA GRASSI Universidade Federal de Mato Grosso do Sul

DOI: https://doi.org/10.20906/CBA2022/346

Keywords: Angle tracking observer, Resolver-to-digital converter, Type-III observer

Abstract

Resolver is an angular position sensor widely used in applications such as electric/hybrid vehicles, CNCs, antennas and robotics. However, the estimation of the angular position from resolver outputs is more difficult than the analysis of encoder signals, and it is still an open question. Most algorithms proposed in literature are based on type-I or type-II angle tracking ob-servers. Recently, a type-III observer was proposed, but it requires a high sampling frequency. This paper explores the use of synchronous demodulation of the resolver outputs to simplify the implementation of a type-III angle tracking observer. The re-solver outputs are sampled at the peaks and valleys of the excitation resolver signal, being easy to get sine and cosine of the an-gular position. The proposed approach reduces the computational cost and the required sampling frequency to implement the type-III observer. Simulation and experimental results proves the accuracy of the proposed approach.