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DRV10975EVM: about EVM with GUI

ACGUY
Guru 11170 points
Part Number: DRV10975EVM

Hello,

Q1:

From "Tuning Gide(SLOU395D)",

"Theoretically, we should choose the threshold to be as small as possible, because we can resynchronize the motor with lower speed.".

What is "resynchronize"? Please let me know detail of "resynchronize".

Q2:

From "Tuning Gide(SLOU395D)",

"Unless the application requires two-direction spinning or it is possible for the motor to have reserve speed before startup, the Enable Reverse Drive function and Brake function should be disabled.".

If motor has rotation by inertia, I think that I can setting Reverce Drive. Is my idea correct?

Q3:

From display for number of rotations on GUI,

I am using a 12-pole motor and I have entered 12 in the Pole field, but the value deviates from the actual motor speed.

If TI has how to fix that please let me know it.

Best regards,

ACGUY

  • 0
    TI__Mastermind 24415 points

    Hi!

    Thanks for posting your question in MD forum. When the motor is spinning in forward direction, the speed and position information measured during ISD are used to resynchronize the motor directly to the closed loop without needing to stop the motor. I will get back to other questions shortly.

    Regards,

    Vishnu

  • 0 in reply to Vishnu Balaraj
    Guru 11170 points

    Hello Vishnu,

    Do you have any update? I looking forward your reply.

    Best regards,
    ACGUY

  • 0 in reply to ACGUY
    TI__Mastermind 24415 points

    Hi ACGUY,

    Please see my response below

    Q2:

    From "Tuning Gide(SLOU395D)",

    "Unless the application requires two-direction spinning or it is possible for the motor to have reserve speed before startup, the Enable Reverse Drive function and Brake function should be disabled.".

    If motor has rotation by inertia, I think that I can setting Reverce Drive. Is my idea correct?

    Yes, if your motor has high inertia and low friction, then reverse drive feature will be helpful to reverse accelerate the motor through zero speed and to continue accelerating until the closed loop threshold is reached.

    Q3:

    From display for number of rotations on GUI,

    I am using a 12-pole motor and I have entered 12 in the Pole field, but the value deviates from the actual motor speed.


    This is a known issue. The Motor speed displayed in RPM in the display tab in GUI is incorrect. Please use the Motor speed in electrical Hz to read the motor speed and then convert to rpm using the below equation:

    Motor speed (rpm) = 60*Motor speed in electrical Hz/Pole pairs.

    Regards,

    Vishnu