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Is LVSERVOMTR salient?

Lu Jun
Prodigy 200 points

Hi Chris,

          I reviewed a previous post to look for some solution.I saw you have said  LVSERVOMTR is salient, but I find its Ls-d and Ls-q are the same in user.h .   I feel confused. Can you help me?

Thanks.

  • 0
    TI__Guru** 118000 points

    We have no way today to ID specific saliency measurement. The FAST based Motor ID only finds average inductance at a given frequency at no load. 

    Our high frequency injection technique - which relies on the motor having saliency, but you don't have to know the specific inductance differences - works well on this motor. Strangely though, the high voltage version of this motor from Teknic does not work at all for high frequency injection. I've asked Teknic if they know the Ls_d and Ls_q but they do not test or design for a specific spec. 

    IF you know the Ls_d and Ls_q of the motor, FAST will give a different estimation of F A S and T. It is a very small difference but important if trying to squeeze out every last bit of efficiency.  It has no effect on stability of the estimation or system.