On-Line Adaptation of the Rotor Time Constant for IM Drives

  • Nguyen Phung QuangEmail author
  • Jörg-Andreas Dittrich
Part of the Power Systems book series (POWSYS)


A typical problem of the field-orientated control consists of the system having to evaluate the actual value of the rotor flux without flux sensors through a model from the measurable terminal quantities of the motor and the speed (cf. Sect.  4.4). The often used current-speed model contains the rotor time constant of the motor as an essential parameter whose exact knowledge influences decisively the quality of the control. This fact and the working point dependence of this parameter motivate the introduction of special measures to primarily compensate the temperature dependence of the rotor resistance. To achieve this, two approaches are in principle conceivable: Either the rotor flux model can be completed by an on-line adaptation method which corrects the rotor resistance permanently, or the rotor flux is estimated by an observer which is insensitive against variations of the rotor resistance. The first approach is subject of this chapter.


Error Model Phase Error Stator Voltage Rotor Resistance Iron Loss 
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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Institute for Control Engineering and AutomationHanoi University of Science and TechnologyHanoiVietnam
  2. 2.Enerdrive GmbHZürichSwitzerland

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