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

Raymundo Cordero García¹; João Onofre Pereira Pinto¹; Edson Antonio Batista¹; Marcio Afoso Soleira Grassi¹

¹ Universidade Federal de Mato Grosso do Sul

Baixar PDF doi:10.20906/CPS/CBA2018-1328

Resumo

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 observers. 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.

Palavras-chave: Angle tracking observer; DSP; resolver; resolver-to-digital converter; type-III observer