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CCS/BOOSTXL-DRV8301: Lab 5e

Maria MJ
Intellectual 340 points

Part Number: BOOSTXL-DRV8301

Tool/software: Code Composer Studio

Hi, 

After successfully accomplishing labs 2a,5c, & 5d, I am working now with lab5e, however I have several questions, 

1- Meanwhile I am using 12V/5A power supply (until my 24V order arrives), motor speed cannot reach more than 2.268999 KRPM, I am using M-2310P-LN-04K motor, could be the power supply be the reason ? how can I calculate that speed reached ? 

2- When trying to figure out the BW scale, I couldn't precisely know which B.W is the right B.W as I could manually rotate the shaft, not smoothly, but I could do it. What could be the reason for that ? 

3- When running the motor, it takes 2 or 3 seconds till the motor rotates, and takes also few seconds till it works with the SpeedRef command, why ? 

4- In the guide its says

'If the motor speed begins to oscillate or show other signs on instability, decrease
“gMotorVars.SpinTAC.VelCtlBwScale” until it no longer oscillates. It typically only needs to be
decreased by 10-15% '

Where can I see these oscillations ? by graph they mean ? is there a button for showing speed oscillations ? as I couldnt find it, please let me know where it is. 

Thanks you.

  • 0
    TI__Guru** 117210 points

    1. Yes, you need to use 24V power supply since the rated voltage of the motor is 24V. Otherwise, you can't spin the motor to a higher speed.

    2. It's an engineering question that depends on the tuning result and the requirement of your system/motor. That's why the guide says tune the BW as Q4 you mentioned.

    3. Take some time to complete the ADC offset calibration.

    4. As replied to your Q2 above. You might take a look at a motor control textbook that should have some description of the control performance criterion of a system.