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DRV8462: It can drive the motor at low frequency, but cannot make the motor run at high frequency.

Annie Liu
Genius 10295 points
Part Number: DRV8462

Hi Team,

When STEP inputs a low-frequency signal, the motor operates normally. When STEP increases to a certain frequency, the motor will not be able to rotate and will make noise. Would you help to check it?

Best regards,

Annie Liu

  • 0
    TI__Mastermind 21475 points

    Hi Annie,

    This is the general behavior of stepper motors at high step rates when VM supply voltage is not sufficient to overcome the back EMF (BEMF) generated at high step rates and unable to push the target current via the motor windings. This depends on motor specifications R and L and BEMF constant, VM supply voltage, target IFS, step rate, accelerate rate, load inertia and load torque. Can you share these details including the stepper motor datasheet.

    A common solution for this behavior will be to increase the VM supply voltage. Assuming the customer was testing with 24 V they can try the same at 48 V. Customer should notice an increase the maximum step rate they can achieve without stalling with higher VM.

    Regards, Murugavel