How to find the orientation of DQ axis of rotor and stator in induction motor using iq and Id currents?

Particularly in foc of im, I have measurement of stator ia, ib, ic and rotor omega. However, rotor omega is not useful since rotor field and rotor spin asynchronously. At this stage, I can do Clark transform now. But how to get I'd and iq next?

Articles for these are not easy to obtain. It would be great if someone could link to reference articles.


1 Answer 1


The DQ axis is not fixed with respect to any mechanical structure since the stator and rotor magnetic fields rotate with respect to both the stator and the rotor.

  • \$\begingroup\$ I would like to find the rotating DQ frame axis. I know my alpha and beta axis. To perform SVM, I need to know DQ axis orientation with respect to alpha beta axis. \$\endgroup\$
    – jrvinayak
    Sep 9, 2019 at 15:31
  • \$\begingroup\$ After I posted my answer, you revised the posting to delete the original question and replace it with a different question. That is not how this site works. \$\endgroup\$
    – user80875
    Sep 10, 2019 at 14:58
  • \$\begingroup\$ Sorry for not going by the norms.. I just thought the question needed elaboration so reframed it without realising that could affect your answer. Since I don't remember how I framed the original question now, I am unable to put it back now. \$\endgroup\$
    – jrvinayak
    Sep 16, 2019 at 11:44

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