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DRV8434A: Motor starting jitter and stop locking problems

user6481287
Intellectual 960 points
Part Number: DRV8434A

Tool/software:

The jitter during power-on is acceptable. In the case of constant power, we want to do every time the motor stops, the next start time do not shake.
In addition, after the motor stops, how to maintain the stopped state is more appropriate.
Is it okay to just stop the pulse? We found that it was hotter.
Now we will pull down the nSLEEP signal into a low power consumption state, so that the motor will not heat up, but the next time we remove the nSLEEP and resend the pulse, we find that the motor has jitter. Is that what happened?

  • 0
    TI__Mastermind 44615 points

    Hi,

    user6481287 said:
    In addition, after the motor stops, how to maintain the stopped state is more appropriate.
    Is it okay to just stop the pulse? We found that it was hotter.

    Yes it is okay to just stop the pulse. With high IFS current settings with VREF long duration of hold current will make the stepper motor very hot. One way to mitigate this will be to reduce VREF voltage while stepper is in hold mode and increase it just before applying steps again.

    user6481287 said:
    Now we will pull down the nSLEEP signal into a low power consumption state, so that the motor will not heat up, but the next time we remove the nSLEEP and resend the pulse, we find that the motor has jitter.

    Every time the device goes to sleep and wake up the stepper indexer will reset to home position and cause a position jitter after awake. To avoid this the outputs can be disabled with ENABLE pin. It must be re-enabled prior to applying step pulses for the motor to move again. Thank you.

    Regards, Murugavel