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DRV8834: The issue of driving aperture

Ryker She
Expert 4320 points
Part Number: DRV8834

Tool/software:

Hi expert,

My customer (Uni-trend) is using the DRV8834 to drive aperture. After driving the aperture to the expected position, the voltage on both motors is released. This time the motor is demagnetizing, causing the aperture to shake slightly. Besides, there are total 24 steps of the aperture and only odd steps (1,3,5,7,9...23) have this issue. Could you give us some suggestions to avoid this issue? Thanks.

Best Regards,

Ryker

  • 0
    TI__Mastermind 44525 points

    Hi Ryker,

    Thank you for your question.

    Ryker She said:
    After driving the aperture to the expected position, the voltage on both motors is released.

    In stepper application it is not good practice to immediately release the voltage on the outputs either with nENBL or nSLEEP after moving a number of steps. Best practice would be to wait until the mechanics stabilize and then disable the driver if customer wants to disable the driver. As well as adding acceleration and deceleration can help mitigate vibrations during start and stop respectively. If using a delay, this would depend on the mechanical design. For these small masses it may be 10's of ms to 100 ms. Customer can try different values for this delay and check for motor vibration after stopping. Thank you.

    Regards, Murugavel