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Thread: TLE9879 Evaluation Kit FOC speed issue

  1. #1
    New Member New Member x94ho2 is on a distinguished road
    Join Date
    Feb 2019

    TLE9879 Evaluation Kit FOC speed issue

    I am trying to run the sample code BLDC_SENSORLESS_FOC_EXAMPLE_TLE987X. When I try to run Emo_setspeedreferenz((X) where X is less than 700, the motor runs jerking, not smooth. Is it because of the wrong type of motor or I need to tune the software
    to run my motor smoother. I am planning to run slower speed on this example code.

    Thank you

  2. #2

    Infineon Employee
    Infineon Employee
    Elettrograffiti is on a distinguished road
    Join Date
    Oct 2019
    Hi x94ho2! Yes, you might need to adjust the software and adapt it to your motor or switch to a Hall sensor application. When running at low speed, a motor exhibits a low BEMF voltage amplitude.
    This could cause the BEMF comparators to detect wrong transitions in the block commutation. But before surrendering, I would try to modify the BEMF parameter we have integrated in the example code.
    To easily access these parameters we have created a special panel in the Config Wizard. If you have correctly installed the toolkit, you can access it from Kiel uVision, click on the menu Tool and then on Config Wizard V2.2.1.
    Click image for larger version

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    There you can see the panel dedicated to the BEMF motor parameters. Adapt your motor to the software and try to change the comparators blanking times.
    Could you also show me some oscilloscope plots of your phases while the motor is running? We could analyze those to see wether the commutation happens correctly or not.
    Good luck!

    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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