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DRV8434SEVM: GUI: Torque count

Taito Takemura
Intellectual 2990 points
Part Number: DRV8434SEVM

Tool/software:

Hi team,

I have a question about the DRV8434SEVM GUI app. In 4.3.6 of the user guide it says that torque count values ​​can be output in CSV format.
I set "Initiate Stall" to ON and the EN_STL bit to 1, but I can't find where "Export Torque Count Values" is.
Could you please tell me the steps to output in CSV format?

Regards,

Taito Takemura

  • 0
    TI__Mastermind 38935 points

    Hi Takemura-san,

    This appears to be a cut and paste error. Sorry about the confusion. I'll add this to our list of corrections to target in our next update cycle. Thank you.

    The DRV8434SEVM has a dedicated test pin to output analog voltage samples @ 8ms/sample continuously, proportional to the torque count. It can be digitized and stored using an oscilloscope for example. The analog voltage = 3.3 V for torque count = 4095. This is the scale.

    Regards, Murugavel

  • 0 in reply to Murugavel4637
    TI__Intellectual 2990 points

    HI Murugavel,

    Thank you for your answer.

    When I click on the bottom left of the GUI app, something like a log is displayed, and when I checked the CSV output, it seemed that the torque count value (trq_count) was updated,
    but does this only update when there is a change in the torque count value?

    Also, I have a question about the stall function. If the motor is set to stop upon stall detection, how long does it have to stay below the threshold before it is determined that a stall has been detected?
    I have a question because it seemed like there was a time difference between the torque count value on the monitor and the time until stall detection.

    Regards,

    Taito Takemura

  • +1 in reply to Taito Takemura
    TI__Mastermind 38935 points

    Hi Takemura-san,

    Taito Takemura said:
    When I click on the bottom left of the GUI app, something like a log is displayed, and when I checked the CSV output, it seemed that the torque count value (trq_count) was updated,
    but does this only update when there is a change in the torque count value?

    Yes this is only a log of the activity if the GUI writes or reads a register or user changes a widget. It will not log torque count automatically or when it changes. It is not meant for that. 

    Taito Takemura said:
    Also, I have a question about the stall function. If the motor is set to stop upon stall detection, how long does it have to stay below the threshold before it is determined that a stall has been detected?

    The first calculation stabilizes in four electrical half-cycles of the phase current waveform. Subsequently the torque count will be updated every electrical half-cycle and compared for stall with stall threshold. So the response time will depend on step rate.  

    Regards, Murugavel