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DRV8889-Q1: stall detection

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8889-Q1

Hi Team,

Customer is currently using TRQ_count to determine motor stall: set a threshold to determine that TRQ_count has entered stall when it is less than that threshold.

The customer tried to stop the motor by hand and find that sometimes the motor does not stop immediately and the indexer has to go many steps before it stops. And sometimes it can stop right away. Is this an expected behavior? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 19380 points

    Hi Cherry,

    It is possible that the difference between the stall threshold and the actual stall torque are to wide. It is recommended to use the stall learning process to determine a more accurate stall threshold. More details about how to implement this stall learning process can be found on the datasheet. 

    It is also worth noting that a stall threshold at one speed may not work well for another speed - therefore it is recommended to re-learn the stall threshold when the motor speed changes.

    Best,

    David