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DRV8300DPW-Q1EVM: DRV8300DPW-Q1EVM: Hall sensor noise reduction

Advait Kulkarni
Prodigy 20 points
Part Number: DRV8300DPW-Q1EVM
Other Parts Discussed in Thread: LAUNCHXL-F28069M

Tool/software:

Hi,

  1.  We have used TI launch pad boards (LAUNCHXL-F28069M) for the model  based development and tested our motor with closed loop configuration. We have used MATLAB model to achieve 6 step commutation.

The  motor is rotating good with control cycle of 500us. When we reduce the control cycle we are observing the control is getting affected because of hall sensor noise. We see that the state is skipping. Can you please let me know if there is anything that we are missing?

Attached the hall  waveform we are getting when the motor is moving.

  • 0
    TI__Genius 12231 points

    Hi Advait, 

    Thank you for posting to our forum.  

    The DRV8300EVM comes equipped with filtering circuitry on the hall-state inputs, and I would like to ask if you could measure the hall inputs at the input terminal block to determine if the root cause is the motor itself?

    If so, you may be able to tune the capacitor/resistor values to better suite the motor, or if possible,  test with a different motor to observe the behavior at the same load/control level.  

    Best Regards, 

    -Joshua,

  • 0 in reply to Joshua Maize
    Prodigy 20 points

    Hi Joshua,

        We are using 1k instead of 10k and rest everything is the same. And we have tested with different motors also. But results are still same. Do you still think we should change the resistor ?

  • 0 in reply to Advait Kulkarni
    TI__Genius 12231 points

    Hi Advait, 

    Thank you for the clarification.  I think It would be beneficial to chnage the resistors back to 10K to observe the filtering change. 

    Have you observed whether this noise occurs at the input terminal before the filtering circuit as well?

    Best Regards,

    -Joshua