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DRV8462: Vibration of stepper motor

Annie Liu
Genius 10295 points
Part Number: DRV8462

Hi Team,

The customer uses the stepper motor driver built by DRV8462. After enabling, there is a slight jitter problem when there is no pulse (or no rotation). May I know how to resolve it?

In addition, the stepper motor remains stationary, is the AB phase continuously supplying current at the same time?

Best regards,

Annie

  • 0
    TI__Mastermind 29935 points

    Hi Annie,

    When the driver is ENABLED and no STEP pulses are input the driver will output the set IFS (full scale current) to keep the stepper in hold position. At power on the indexer will be in reset position which is 45º electrical angle.as show in Table 7-7 to 7-9 in the datasheet. So in the reset position both A and B phases will be energized providing maximum hold torque. This is expected behavior.

    I'm not sure I understand the 'slight jitter problem' correctly. Does the motor have physical vibration or just audible noise? I assume the device is used in SPI mode please confirm. It it is an audible noise issue the stand still current can be reduced (to as low as 1% of the IFS value) by enabling the stand still current savings mode by programming the registers when used in SPI mode. Additionally Silent Stepping mode can help minimize or eliminate the audible noise at stand still and/or low speeds. These features will help with the mentioned stand still observation.

    Regards, Murugavel 

  • 0
    Expert 1300 points

    The jitter could be due to insufficient current being supplied to the motor. Increase the current limit set on the DRV8462 to provide a higher current to the motor. If you're not already using microstepping, enable it on the DRV8462. Microstepping divides each full step into smaller microsteps, which can help reduce motor vibration and improve smoothness. 

    By the way, you can also try the DRV8255 stepper motor driver to see which one performs better:

    www.ti.com/.../drv8825.pdf

    www.pcbway.com/.../A4988_or_DRV8255_stepper_motor_driver_breakout.html