Sensorless Self-Commissioning of Synchronous Reluctance Motors at Standstill Without Rotor Locking

Marko Hinkkanen, Paolo Pescetto, Eemeli Mölsä, Seppo E. Saarakkala, Gianmario Pellegrino, Radu Bojoi

Research output: Contribution to journalArticleScientificpeer-review

69 Citations (Scopus)
309 Downloads (Pure)


This paper proposes a standstill method for identification of the magnetic model of synchronous reluctance motors (SyRMs). The saturation and cross-saturation effects are properly taken into account. The motor is fed by an inverter with a short sequence of bipolar voltage pulses that are first applied on the rotor d- and q-axes separately and then simultaneously on both the axes. The stator flux linkages are computed by integrating the induced voltages. Using the current and flux samples, the parameters of an algebraic magnetic model are estimated by means of linear least squares. The proposed method is robust against errors in the stator resistance and inverter voltage, due to the high test voltages (of the order of the rated voltage). The fitted model matches very well with the reference saturation characteristics, measured using a constant-speed method, and enables extrapolation outside the sample range. The method was tested with a 2.2-kW SyRM, whose shaft was uncoupled from any mechanical load, which is the most demanding condition for this method. The proposed method can be used for automatic self-commissioning of sensorless SyRM drives at standstill.
Original languageEnglish
Pages (from-to)2120-2129
Number of pages10
JournalIEEE Transactions on Industry Applications
Issue number3
Early online date23 Dec 2016
Publication statusPublished - 18 May 2017
MoE publication typeA1 Journal article-refereed


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