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Original question:

LAUNCHXL-F28069M: about motor Identifying

LAUNCHXL-F28069M: about Flux_VpHz

hongwei Quan
Prodigy 190 points
Part Number: LAUNCHXL-F28069M

Dear Yanming Luo:Got a new question and would like your help! I made two same PCB boards, same program, same motor, same load, but different experiment results, MCU uses 28069F. I checked the relevant voltage and current sampling circuit, the sampling value is the same when the voltage is the same, USER_MOTOR_RATED_FLUX = (0.8165*220.0/50.0), but when one of the circuit boards is running
gMotorVars.Flux_VpHz=3.5, gMotorVars.Flux_Wb=0.52, gMotorVars.Flux_Nm=1.24, this data is the value I hope, which is consistent with the actual situation, when another board is running, gMotorVars.Flux_VpHz=1.6, gMotorVars.Flux_Wb=0.26 , gMotorVars.Flux_Nm=0.51, this data is not the value I hope, obviously, the magnetic field strength is insufficient and the load capacity is insufficient. I checked for two days, but found nothing, because gMotorVars.Flux_VpHz = EST_getFlux_VpHz(obj->estHandle), I can't continue to check, please help to analyze what is the reason?

Thanks!

best regard!

Quan.

  • 0
    TI__Guru** 109760 points

    The issue could be from the current/voltage sensing circuit, you may have to check if these sensing signals are correct or same on these two boards. You may try to change the filter capacitors of the voltage sampling circuit.

  • 0 in reply to Yanming Luo
    Prodigy 190 points

    Dear Yanming Luo:Thank you very much for your reply. These two questions have always been the focus of my inspection. The filter circuit of the voltage signal is shared, and the pre-circuit of the current sampling is shared. It should not be the cause of this problem, I am thinking , is it because the in-chip FAST program is not the same? Because the two chips are not in one batch, and the displayed motor voltage is also doubled. In the end, the chips of the two boards can only be swapped to check where the problem is, it is currently difficult to get 28069F in the Chinese market, which is really a hassle.

    Thanks!

    best regard!

    Quan.

  • 0 in reply to hongwei Quan
    Prodigy 190 points

    In addition, during the experiment, only the MCU control board is replaced with a set of devices, and all the main circuits and sensors are shared.

  • 0 in reply to hongwei Quan
    Prodigy 190 points

    Dear Yanming Luo:Thank you for your hint, the problem has been solved, the current sampling hardware reason.

    Thanks!

    best regard!

    Quan.