Sensorless synchronous motor drives: A review of flux observer-based position estimation schemes using the projection vector framework

Anantaram Varatharajan, Gianmario Pellegrino, Eric Armando, Marko Hinkkanen

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Abstract

This article reviews six fundamental-wave excitation sensorless techniques for synchronous machines reported in the literature. All the techniques rely on a hybrid flux observer scheme, combining the voltage and current-models of the machine, and use the flux observer error signal to track the rotor phase angle and the rotational speed. A common mathematical framework with magnetic nonlinearity is constructed for the stability analysis where each of the studied technique is represented by a unique projection vector. The dynamics of the flux and the position observer is investigated and the regions of instability are identified for each scheme under similar operating conditions. Experimental validation to support the stability analysis is reported on a 1.1-kW synchronous reluctance machine test-bench.

Original languageEnglish
Article number9312430
Pages (from-to)8171-8180
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume36
Issue number7
DOIs
Publication statusPublished - 1 Jan 2021
MoE publication typeA2 Review article in a scientific journal

Keywords

  • Sensorless control
  • Synchronous machine
  • Projection vector framework
  • Stability analysis

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