Stable and Passive Observer-Based V/Hz Control for Synchronous Motors

Lauri Tiitinen, Marko Hinkkanen, Jarno Kukkola, Mikko Routimo, Gianmario Pellegrino, Lennart Harnefors

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

1 Citation (Scopus)
56 Downloads (Pure)


This paper proposes an observer-based volts-per-hertz (V/Hz) control method for synchronous motors. The method is applicable to any synchronous motor type, from permanent-magnet (PM) motors to synchronous reluctance motors (SyRMs). The method consists of a state-feedback control law and a state observer, both of which are designed to be inherently sensorless. The gains can be selected using simple closed-form expressions, resulting in a locally stable and passive system in the whole feasible operating range. Unstable regions and heuristic tuning of conventional V/Hz control are thus avoided. Compared to sensorless field-oriented control, neither speed controller nor separate field-weakening method is needed, the full inverter voltage can be utilized, and the sensitivity to parameter errors is reduced. For the majority of industrial drive applications, the dynamic performance of the proposed method is adequate.
Original languageEnglish
Title of host publication2022 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages8
ISBN (Electronic)978-1-7281-9387-8
ISBN (Print)978-1-7281-9388-5
Publication statusPublished - 13 Oct 2022
MoE publication typeA4 Article in a conference publication
EventIEEE Energy Conversion Congress and Exposition - Detroit, United States
Duration: 9 Oct 202213 Oct 2022

Publication series

NameIEEE Energy Conversion Congress and Exposition
ISSN (Electronic)2329-3748


ConferenceIEEE Energy Conversion Congress and Exposition
Abbreviated titleECCE
Country/TerritoryUnited States


  • Magnetic flux
  • Sensitivity
  • Magnetization
  • Magnetic separation
  • Energy conversion
  • Observers
  • Inverters


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