Demodulation Approach for Slowly Sampled Sensorless Field-Oriented Control Systems Enabling Multiple-Frequency Injections

Marco Roetzer, Ulrich Vollmer, Ralph M. Kennel

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This paper describes a demodulation approach based on the least squares method for a saliency-based position estimation in slowly sampled field-oriented control systems. The proposed approach focuses on the sensorless control of electrical drives in which the sample rate of the control task chosen is slower than both the maximum possible update rate of the phase voltages and the maximum possible sample rate of the phase current measurement by a multiple. Under those conditions, it is possible to inject multiple-frequency carrier signals between two successive control sampling instances without affecting the control. Furthermore, a combined demodulation of these signals is enabled by exploiting the constant manipulated variables of the field-oriented control system during the injection sequence. With the proposed method, the signal-to-noise-ratio of the calculated rotor position as well as the acoustic noise produced by signal injections can be optimized. The approach is implemented in a field-oriented control for permanent magnet synchronous machines and is verified in experiments.

Original languageEnglish
Article number8052130
Pages (from-to)732-744
Number of pages13
JournalIEEE Transactions on Industry Applications
Volume54
Issue number1
DOIs
StatePublished - 1 Jan 2018

Keywords

  • Carrier signal injection
  • multiple-frequency injection
  • permanent magnet machines
  • self-sensing
  • sensorless control

Fingerprint

Dive into the research topics of 'Demodulation Approach for Slowly Sampled Sensorless Field-Oriented Control Systems Enabling Multiple-Frequency Injections'. Together they form a unique fingerprint.

Cite this