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ACIM Identification, Inductance estimation value

Paul Yoo
Prodigy 20 points
Other Parts Discussed in Thread: MOTORWARE

Hello

I am developing a motor control system with InstaSPIN motor solution.

While I was testing ACIM with labs you were provided, Inductance measurement seems not steady.

The motor that I have now has horrible datasheet and I have no idea what State Inductance would be.

I am getting around 0.04 to 0.09 H for Lsq and Lsd.

However, based on detail description from est.h, fullscale inductance of HVKIT is ~0.012H

***

USER_IQ_FULL_SCALE_VOLTAGE_V/(USER_IQ_FULL_SCALE_CURRENT_A * USER_VOLTAGE_FILTER_POLE_rps)

= 450/(10*(372.5)*2*pi) = 

***

which does not make sense to me.

(can stator inductance be bigger than fullscale inductance?)

While I was trying to find an answer

i found this thread 

Some troubles in indentification of the ACIM - C2000 microcontrollers forum - C2000™︎ microcontrollers...

e2e.ti.com
Other Parts Discussed in Thread: MOTORWARE Dear, Now I have some troubles in indentification of the ACIM. 1、When I do the indentification of the ACIM,before

Has this been resolved?

  • 0
    TI__Guru** 118800 points
    "Has this been resolved?"

    The short answer is no, it hasn't been resolved and we don't have a schedule of when it will be.

    There are some variable scaling issues that come into play with induction motors that we didn't catch upon first ROM release. For future ROMs (future new devices only) this will be fixed, but we are still looking to see if there is anything we can do for existing ROM library.
  • 0 in reply to ChrisClearman
    Prodigy 20 points
    Thank you Chris-

    There is no other way around to estimate Inductance of some ACIM with existing ROM for now, right?
    So, If I can't get right Inductance, I should use datasheet or LCR meter to read/measure those values and it should work with existing motorware library. Is this correct?

    Thanks,
    Paul
  • 0 in reply to Paul Yoo
    TI__Guru** 118800 points
    Correct, ACI motor ID does not currently work easy enough for many ACI motors. There is no work around at this point.

    Often the Ls value that you get from the initial RoverL test is good enough. You can then "tune" the value of Rr if you can actually measure the real speed vs. the estimated speed.