High-accuracy all-digital resolver-to-digital conversion
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Document typeArticle
Defense date2011-04-19
PublisherIEEE Press. Institute of Electrical and Electronics Engineers
Rights accessRestricted access - publisher's policy
Abstract
In this article, a high-accuracy all-digital resolverto-
digital converter is presented. The two basic components of
a conventional tracking R/D converter, the phase detector and
the loop filter, are software implemented by frequency shifting
techniques and a decoupled Double Synchronous Rotating
reference Frame-based PLL (DSRF-PLL). This PLL allows the
simultaneous extraction of the angular position and speed of the
rotatory resolver, even in the presence of gain and phase errors
in the resolver. In order to increase accuracy and to minimize
the time lag of the whole system, oversampling methods and
downsampling FIR digital filters are introduced. Finally, DSP
implementation issues, like the use of techniques to synchronize
the resolver output signals with the excitation one, are discussed.
Using these combined techniques and a standard DSP with a
12-bit ADC, resolutions of up to 14 bits can be achieved with
a computation cost of about 13% of the total (100 MIPs). The
paper presents the main techniques, simulation and experimental
results.
CitationBergas, J. [et al.]. High-accuracy all-digital resolver-to-digital conversion. "IEEE transactions on industrial electronics", 19 Abril 2011, vol. 58, núm. 12.
ISSN0278-0046
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