Direct flux control – sensorless control method of PMSM for all speeds – basics and constraints

Tobias Muller, Chan H. See, Arfan Ghani, Akram Bati, Peter Thiemann

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)
    260 Downloads (Pure)


    magnet synchronous machines and proposes a viable solution. The main concept of sensorless control of drives relies on additional information given by the machine during its normal operation. This information provided by the machine is essentially the Back Electro Motive Force and the variance of the stator inductivity, which are dependent on the rotor position. Several approaches and methods have discussed these problems and in most cases, they are not avoidable and that some methods work better on certain speeds of the drives. This paper presents the Direct Flux Control method to combat the above problems at all speeds. The flux linkage signal which contains the necessary information about the rotor position, can be measured between the neutral point of a permanent magnet synchronous machine and an artificial one. The mathematical derivation and the observations from the experiments show that this signal contains a second and a forth harmonic, which can be used to calculate the rotor position. Furthermore, the limitations of implementing Direct Flux Control are also addressed.
    Original languageEnglish
    Pages (from-to)1110-1111
    Number of pages2
    JournalElectronics Letters
    Issue number16
    Early online date20 Jun 2017
    Publication statusPublished - 17 Aug 2017

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    • permanent magnet generators
    • synchronous machines
    • sensorless machine control
    • rotors
    • flux linkage signal
    • direct flux control-sensorless control method
    • PMSM
    • permanent magnet synchronous machines
    • back-electro motive force
    • stator inductivity


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