Sensorless PMSM Drive Based on Stator Feedforward Voltage Estimation Improved with MRAS Multiparameter Estimation

Omer Cihan Kivanc, Salih Baris Ozturk*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

189 Citations (Scopus)


In order to reduce the adverse effect of parameter variation in position sensorless speed control of permanent magnet synchronous motor (PMSM) based on stator feedforward voltage estimation (FFVE), multiparameter estimation using a model reference adaptive system is proposed. Since the FFVE scheme relies on motor parameters, the stator resistance and rotor flux linkage are estimated and continuously updated in the FFVE model in a closed-loop fashion, and the sensitivity to multiparameter changes at low speed is eliminated. To improve the dynamics and stability of the overall system and eliminate transient oscillations in speed estimation, a phase-locked loop like speed estimation method is proposed, which is obtained by passing the q-axis proportional integrator (PI) current regulator output through a first-order filter in the FFVE scheme. The proposed control method is similar to V/f control as in induction motors; therefore, starting from zero speed is possible. The experimental tests are implemented with 1-kW PMSM drive controlled by a TMS320F28335 DSP. The proposed sensorless scheme is also compared with the classical sliding mode observer (SMO). Experimental results show that the proposed sensorless scheme exhibits greater stability at lower speed than the classical SMO under parameter detuning. Experimental results and stability analysis demonstrate the feasibility and effectiveness of the proposed sensorless scheme for PMSM under various load and speed conditions.

Original languageEnglish
Pages (from-to)1326-1337
Number of pages12
JournalIEEE/ASME Transactions on Mechatronics
Issue number3
Publication statusPublished - Jun 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 1996-2012 IEEE.


Manuscript received August 24, 2017; revised December 6, 2017 and February 2, 2018; accepted March 13, 2018. Date of publication March 22, 2018; date of current version June 12, 2018. Recommended by Technical Editor S. K. Dwivedi. This work was supported by the Scientific and Technological Research Council of Turkey through Project Grant 112E263. (Corresponding author: Salih Baris Ozturk.) The authors are with the Department of Electrical and Electronics Engineering, Okan University, Tuzla, Istanbul 34959, Turkey (e-mail: cihan. [email protected]; [email protected]).

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu112E263


    • Model reference adaptive system (MRAS)
    • multiparameter estimation
    • parameter detuning
    • parameter estimation
    • parameter variation
    • permanent magnet synchronous motor (PMSM)
    • sensorless control
    • stator feedforward voltage estimation (FFVE)
    • V/f control
    • V/Hz control
    • volt/Hz control


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