Optimum-seeking field weakening control of induction motor drives

L. Harnefors, K. Pietilainen, Lars Gertmar

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review


The optimum-seeking (in the sense of maximisation of torque) field weakening control scheme proposed by Kim and Sul (see IEEE Trans. Ind. Electron., vol. 44, no.4, p.512-18, 1997) is developed further. The performance under imperfect field orientation conditions is investigated, and it is shown that an overestimated-rather than an under-estimated-model leakage inductance should be used. A slightly modified algorithm, which offers better robustness and reduced computational complexity, is presented. The importance, for good performance, of combining the scheme with a current controller featuring anti-windup and improved disturbance rejection is emphasized. The dynamics of the resulting closed-loop system are analysed. Thus obtained are rules for selection of all controller parameters, allowing for straightforward implementation and commissioning. Good performance of the resulting system is verified experimentally.
Original languageEnglish
Title of host publication[Host publication title missing]
Publication statusPublished - 2000
EventIEEE 8th International Conference on Power Electronics and Variable Speed Drives - London, United Kingdom
Duration: 2000 Sept 182000 Sept 19


ConferenceIEEE 8th International Conference on Power Electronics and Variable Speed Drives
Country/TerritoryUnited Kingdom

Subject classification (UKÄ)

  • Other Electrical Engineering, Electronic Engineering, Information Engineering


  • inductance
  • robust control
  • optimal control
  • electric current control
  • closed loop systems
  • machine control
  • induction motor drives


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