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TMS320F280037C: Universal Motor Control Lab DMC build level 3 vs DMC build level 4 'Idq' vector

Aric Gerspacher
Prodigy 120 points
Part Number: TMS320F280037C

Hello,

When I run motor control build level 3 (DMC_BUILDLEVEL  DMC_LEVEL_3) my Idq out and in vectors graphed using datalog look like this:

When I switch to build level 4, they look like this:

This seems extremely bad, since Id should be constantly referenced to zero while Iq should be the non-zero commanded current.

The fact they swap places when I redefine the build level for the lab is also worrying.

I am also now thoroughly confused as to which part of the vector is the direct and quadrature axis.

Any insight on this?

  • +1
    TI__Mastermind 43076 points

    Hi,

    Which estimator type are you using? Do you have field weakening control (FWC) enabled?

    In your first waveforms (Build Level 3) you can see that idq_out_A.value[0] (Id) is properly set to zero.

    For Build Level #4 can you check what 'IdRated_A' value is set to (Assuming FWC is disabled)? I think this may be the reason idq_out_A.value[0] (Id) isn't set right at zero, it is constant however.

    Aric Gerspacher said:
    The fact they swap places when I redefine the build level for the lab is also worrying.

    Not sure what you mean by this.

    Aric Gerspacher said:
    I am also now thoroughly confused as to which part of the vector is the direct and quadrature axis.

    [0] parameters will refer to Id and [1] parameters will refer to Iq.

    Best,

    Kevin

  • 0 in reply to Kevin Allen18
    Prodigy 120 points
    Kevin Allen18 said:
    Which estimator type are you using?

    I am using FAST estimator and PMSM style BLDC motor.

    Kevin Allen18 said:
    Do you have field weakening control (FWC) enabled?

    FWC is currently disabled, and there are no plans to use this particular motor faster than rated RPM.

    Kevin Allen18 said:
    The fact they swap places when I redefine the build level for the lab is also worrying.

    Not sure what you mean by this.

    It is a blunt observation: in the first set of graphs, Id_out_A.value[0] appears a constant offset value and Id_out_A.value[1] appears to follow zero.

    In the second set of graphs, Id_out_A.value[0] appears to follow constant zero and Id_out_A.value[1] appears a constant offset value.

  • 0 in reply to Aric Gerspacher
    Prodigy 120 points
    Kevin Allen18 said:
    For Build Level #4 can you check what 'IdRated_A' value is set to (Assuming FWC is disabled)? I think this may be the reason idq_out_A.value[0] (Id) isn't set right at zero, it is constant however.

    Reiterating FWC should be disabled.

    I set the build level back to 4, and this is the value of the IdRated_A expression:

    Running the motor, 'Id' sets to 0.5:

     

    It appears that 'Id' is being set by motorVars_M1.fluxCurrent_A

    I just set this to zero, and now 'Id' is following zero instead of 0.5

    Anyway, this particular situation is much clearer now. Thank you!