Discrete-time observer design for sensorless synchronous motor drives

Toni Tuovinen, Hafiz Asad Ali Awan, Seppo E. Saarakkala, Marko Hinkkanen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

4 Citations (Scopus)


This paper deals with the speed and position estimation of interior permanent-magnet synchronous motor (IPMSM) and synchronous reluctance motor (SyRM) drives. A speed-adaptive full-order observer is designed and analyzed in the discrete-time domain. The observer design is based on the exact discrete-time motor model, which inherently takes the delays in the control system into account. The proposed observer is experimentally evaluated using a 6.7-kW SyRM drive. The analysis and experimental results indicate that drastic performance improvements can be obtained with the direct discrete-time design, especially if the sampling frequency is relatively low compared to the fundamental frequency.
Original languageEnglish
Title of host publicationProceedings of the 2015 IEEE Energy Conversion Congress and Expo, ECCE 2015
ISBN (Print)978-1-4673-7150-6
Publication statusPublished - 20 Sep 2015
MoE publication typeA4 Article in a conference publication
Event IEEE Energy Conversion Congress and Exposition - Montreal, Canada
Duration: 20 Sep 201524 Sep 2015
Conference number: 7


Conference IEEE Energy Conversion Congress and Exposition
Abbreviated titleECCE


  • observer
  • parameter uncertainties
  • speed sensorless
  • stability conditions


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