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DRV5053: Hall Effect Sensors Output anomaly

garin zhu
Intellectual 360 points
Part Number: DRV5053

The motor parameters are: 7 pairs of pole DC brushless motor, according to the current Hall Effect Sensors installation position and motor parameters, Holzer's phase difference should be 90 degrees.

The current test encountered problems:           

(1) the electrical angle of the two positions is 90 degrees, but it is found that the stator (coil) has a great influence on the amplitude of its induction. One of them is even V1pp=400Mv.       

(2) when we found debugging, beginning Holzer induction was normal (normal, but also the angle difference) after a period of operation, the voltage waveform is induced by the poor, the poor electrical angle sampling also deviated from 90 degree (before many chip well, running after a period of time, there is reproduction of this problem, irreversible)

  • 0
    TI__Expert 5705 points
    Hi Garin,

    Thank you for considering the DRV5053 for your design. I would be glad to assist you but first I have a few questions.

    Based on your description it sounds like you are trying to decode shaft angle using 2 hall sensors configured with 90 degree electrical phase difference. Is that correct? If so, what part of the motor should be exciting the sensors? Could you share a mechanical drawing showing the motor construction, placement and relative distances between the magnetic source and the sensors?

    I'm assuming the waveforms shown represent the sensor outputs being observed. What should the ideal outputs look like based on your placement?

    What specific questions do you have that you would like me to help you with?

    Best Regards,
    Harsha Munikoti
  • 0 in reply to Harsha Munikoti
    TI__Expert 5705 points

    Hello Garin,

    I haven't heard from you in a while so I’m hoping your issue is resolved.  If it is not or you need more assistance on this topic, just post a reply below (or create a new thread if the thread has locked due to time-out).

    Thank you for using TI and we appreciate your business.

    Best Regards,

    Harsha