• State TI Thinks Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 254 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8353RS-EVM: Motor not rotating with the GUI tool

Sidtharthan K.Ti
Prodigy 20 points
Part Number: DRV8353RS-EVM

Tool/software:

Hi!!

We are trying to use the DRV8353RS EVM kit with a 48V 1000W, 4pole pair BLDC motor to test the EVM.

Also we have installed the DRV8353Rx GUI tool in our systyem. After powering up the EVM with connections done, the parameters in the GUI are automatically populated on the Screen. When we select the start motor option, the motor is not spinning. The controller state displayed in the motor identification column of the GUI transitioned from idle to online and when the estimator state was transitioning from the state Rs to RampUp state, the fault-LED in the EVM lights up. The current in the supply increases from 50mA to 110mA with small vibration in the motor and stops. The controller state then transitions in steps from RampUp to RampDown and then directly goes to Idle state without going to MotorIdentified state. After the Identification, pressing the Start does not give any response in the system.

 

When the registers in the GUI is read to check for the fault condition, Gate Drive Fault (GDF[8]) bit is set high in the Fault status1 register. In the VGS status2 register, GDUV[6] and VGS_HA[5] bit is set high. We checked the phase A high side mosfet's Rgs and Rds, which is having high impedance values as in the other mosfets.

So, we are not sure why this issue has occurred. We are trying to make the motor run, kindly help us in resolving this issue.

And also we need clarity on what values to be populated for the parameters in the motor identification section for the motor to run.

  • 0
    Prodigy 20 points

    We have checked the same with a working motor(QS motor) which was tested to be run when integrated with a custom driver board. When using this QS motor with the DRV8353RS EVM, we are facing the same issue as described above. Now, we have excluded the motor from our doubt. Now the doubt is whether the EVM has some issue or something to be looked into. Or the GUI settings which we have set is not compatible for the motor running, if so let us know what values should be set in the motor identification column.

  • 0 in reply to Sidtharthan K.Ti
    TI__Expert 4795 points

    Hi Sidtharthan,

    Would you be able to provide waveforms of what is happening here?

    I would like to see waveforms from channel A high side at the time of the fault. 

    Please let me know if you can provide these waveforms so we can continue debugging.

    Thank you,

    Joseph

  • 0 in reply to Joseph Ferri
    Prodigy 20 points

    Hi Joseph Ferri,

    I have probed the Source(Green) and Gate(Yellow) using two different probes here and used math to plot their difference. I Captured this wave exactly when the motor stops vibrating and Fault LED grows brighter during the RS phase. The Supply voltage to the EVM is 48Volts.

     

    Below is the image of the gate signal when the Motor Identification state is initialized with its zoomed image. 

     

  • 0 in reply to Sidtharthan K.Ti
    TI__Expert 4795 points

    Hi Sidtharthan,

    Can you confirm that you are operating this EVM at the IDRIVE setting 150mA/300mA sink/source current?

    On the datasheet, this device defaults to the highest IDRIVE setting, but please make sure you are operating at 150/300 setting, following the user's guide.

    If that does not fix the issue, try both versions 1.0.0 and 1.0.1 of the GUI and see if either works.

    Thank you,

    Joseph

  • 0 in reply to Joseph Ferri
    Prodigy 20 points

    Hi Joseph Ferri,

    I have checked with the I Drive settings, and it is set to 150mA/300mA sink/source current. I have also tried using both the versions 1.0.0 and 1.0.1 of the GUI and both of them gives me similar responses with my motor. Is there any other way to identify the issue?

  • 0 in reply to Sidtharthan K.Ti
    TI__Expert 4795 points

    Hi Sidtharthan,

    Try changing VDS_LVL bits in register 0x05 from the default 1001b to 1110b. Please see if this resolves the start up issue.

    Thank you,

    Joseph