Software-Based Resolver-to-Digital Converter Using an <i>α</i>–<i>β</i>–<i>γ</i> Filter
Jiming Zou, Pengcheng Zhu, Wentao Zhang, Yongxiang Xu, Jibin Zou
Abstract
The software-based resolver-to-digital converter (RDC) is cost-effective and widely used to obtain an angular position. Angle estimation is an essential procedure in an RDC, but conventional angle estimation methods face difficulties in parameter tuning and lack analysis of the parameters. To overcome these problems, a novel angle estimation method based on an α-β-γ filter is proposed in this paper, which only requires tuning one parameter. The performance measures to gauge the tracking ability, noise filtering strength and transient response performance are derived. In addition, this paper analyzes the impacts of nonideal characteristics when using frequency-shifting technique. To suppress the impacts, an amplitude corrector is further proposed. Combined with the α-β-γ filter and the amplitude corrector, the proposed RDC has excellent performance in terms of noise rejection, fast position response and tracking ability. Experimental tests verify the effectiveness and feasibility of the proposed RDC system.