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relationship between rotor flux angle and Iq for IPM

Miao Qian
Intellectual 460 points

Dear sir/madam,

   I read  SPRUHP4.pdf, and see "Ideal Orientation: 90 degrees for non-salient synchronous; slightly more for salient machines, and slightly less in asynchronous machines since part of the current vector is also used to produce rotor flux" on page 11. 
    So can you give me the relationship or formula between rotor flux angle and Iq for IPM?
    Best regards,
Qian.Miao
  • 0
    TI__Expert 4760 points

    Hi Miao,

    Just to clarify, Iq always remains on the quadrature axis with respect to the rotor flux. Its orientation does not change. However, what does change angle for different motors is the total stator current vector with respect to the rotor flux vector. This angle is changed by adjusting the d-axis current amplitude as well as the q-axis current level.

    In most cases with an IPM motor (assuming you are not in the field weakened region of operation), you want to control both Iq and Id in such a way as to achieve maximum torque per amp. The way you do this is to take the output of the speed controller (which we will call torque current, IT), and split it up between Id and Iq as shown below:

     

      

     

     

    Regards,

    Dave

  • 0 in reply to Dave (Wisconsin) Wilson
    Intellectual 460 points
    Hi Dave,
    I got it, thank you very much!
    Regards,
    Qian.Miao