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MCF8316AEVM: How can I get access to the motor mechanical parameters on the GUI

Alisson Pereira
Prodigy 25 points
Part Number: MCF8316AEVM
Other Parts Discussed in Thread: MCF8316A

I am working on an improved control strategy for a specific motor and I will need to know the mechanical parameters (load inertia and frictional coeffient) of the motor. I've seen on the MCF8316A Datasheet that these parameters are estimated with the MPET. However, I didn't find any way to access the values of these parameters on the MCF8316A_GUI. All the references take me to the electrical parameters only.

Can anyone help me with this?

Thanks & Regards,

Alisson Marden

  • +1
    TI__Mastermind 18981 points

    Hi Alisson, 

    From datasheet info, I believe the MPET process may only store the calculated KP and KI values rather than all of the motor parameters. 

    Will let someone from our team confirm shortly 

    Best Regards, 
    Andrew 

  • 0 in reply to Andrew Liu
    TI__Genius 9220 points

    Hi Alisson,

    As Andrew pointed out, MPET estimates the mechanical parameters internally and uses them to calculate Kp and Ki. However, the values for the estimated inertia and frictional coefficients are not stored or accessible to the user.

    Regards,
    Eric C.

  • 0 in reply to Eric Chen
    Prodigy 25 points

    Hi Eric,

    Thank you for your reply. Is it possible to mathematically calculate the mechanical parameters from the tuned Kp and Ki? (If, of course, the tuning procedure is not iteractively run).

    What I mean is that, since I have the motor electrical parameters and controller parameters, if I have access to the internal tuning procedure, I would be able to do the reverse calculation and get the mechanical parameters I need. It would reduce a lot of extra work to estimate the motor parameters myself.

    Thank you again,

    Alisson

  • 0 in reply to Alisson Pereira
    TI__Mastermind 24415 points

    Alisson,

    Motor manufacturer should be able to provide the mechanical parameters. Unfortunately, we do not share the equations used to calculate speed loop Kp and Ki based on mechanical parameters. May I know why you need the mechanical parameters? 

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    Prodigy 25 points

    Vishnu,

    Thank you for your attention. I'm working on a project that requires tuning of a syncronized multimotor controller. I need the mechanical parameters to improve the coupling and the tuning of the speed controllers. 

    Anyway, I will take some extra time and do some research to solve my problem.

    Regards,

    Alisson.