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DRV8462: Problem with taking single steps.

Maciej Czerwinski
Prodigy 30 points
Part Number: DRV8462

Hello,
I am using DRV8462 to control stepper motors DINGS 17E2115AB4-69SNSN-130. 

The supply voltage is 24V. I use physical STEP and DIR pins and control other registers via SPI. The motors run with full step and automatic 1/32 microstep with frequency 300Hz. I use stand still power saving, automatic torque and stall detection.

My problem is moving with a single number of steps, such as 1-5 steps. When I move a higher number of steps, everything is fine, but doing 1-5 does not cause any movement. The screw only makes a vibration but returns to its original position. I check this by repeating taking single steps, waiting, taking single steps and so on.... Is there any way to make a single number of steps? Will increasing the maximum current in the ATQ help?

  • 0
    TI__Mastermind 20775 points

    Hello,

    Automatic torque is intended for operation at a steady velocity. It may not kick-in correctly with single step movements. For single step movements we recommend to disable auto torque feature. 

    Regards, Murugavel

  • 0 in reply to Murugavel4637
    Prodigy 30 points

    Thank you for your reply. This helps! Any movement with a step greater than 1 works fine. But there is still a problem with one step movement, especially when I try to move one step in one direction and then one step in the opposite direction, then often the second step in the opposite direction does the real movement. Is there any other method to fix this? I have tried with different current values. Reducing the frequency might help?

    Murugavel4637 said:
    Automatic torque is intended for operation at a steady velocity.

    Interesting. I plan to do acceleration and deceleration ramps. Can I use ATQ during the ramps? I was planning to change the frequency and automatic torque at 100 Hz during the ramp from Fstart to Ffinish.

  • 0 in reply to Maciej Czerwinski
    TI__Mastermind 20775 points

    Hello Maciej,

    If I understood correctly by frequency, you meant the time delay between forward and reverse single step - correct? A lot depends on motor torque output and system inertia. Generally speaking full-step mode generates highest torque for slow speed such as 1 PPS. Full-step 100% mode can provide extra torque (normally 71% mode is used). Is it possible to capture the current waveforms of the phase winding with this test condition?

    Our recommendation would be to enable ATQ only after the stepper reaches target velocity and disable ATQ during ramp up and down.

    Regards, Murugavel