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DRV8312EVM Demo

Hans
Genius 12865 points

Other Parts Discussed in Thread: INSTASPIN-BLDC

Hello Team,

I have several question about the DRV8312-EVM. May I kindly ask you to have a look at the attached document, please?

Thanks and Best Regards,

Hans-Günter Kremser

Questions.docx
  • 0
    TI__Guru** 119680 points

    1)     I tried to use the GUI "InstaSPIN-BLDC_GUI_DRV83xx_v104.exe" but I didn’t manage to get the motor running. It only works when I use the GUI “DRV8312GUIv5.exe”.
    Please explain, why.

    The crosshairs based GUI .exe require a specific paired.out be paired on the controlCARD.  If v5.exe works then it must have the v5.out programmed on the card.  To make v104.exe work you need to program the controlCARD with the v104.out

    FYI - for the GUI Composer based GUIs (which we started using for InstaSPIN-FOC and -MOTION), the .exe automatically loads the paired .out as it launches, which is a nice feature.

    2)     May I kindly ask for a description of the terms “Phase A Space Vector Waveform”, “Phase A Reconstructed Phase to Neutral Voltage” and “Estimated Commutation Angle” which I found in the User’s Guide:

    Phase A is one of the three phases (A, B, C or usually called U, V, W).

    The Current is from the output of the Clarke module (which takes three phase and converts them into Alpha/Beta).

    Space Vector is the modified sine waveform output (looks like a slightly wider sinewave with two humps) that enables a boosting of the average voltage applied to the terminal. This is very common in FOC solutions, there is plenty of material on this topic on-line.

    Reconstructed Phase to Neutral voltage is the sampled voltage of a Phase.

    Estimated Commutation Angle is the angle output for the software observer. It is trying to track the rotation of the rotor. It will look like a sawtooth, going from 0 to 2pi, or -1 to 1.

    3)     Please provide a description of the numbers in the 4 screens. E.g. how much current does 460.00 mean in the top screen, please. What is the timing?

     these are all in IQ15 (you can tell this by looking at DRV8312GUI_Main.c) and see that there is a conversion from global Q to IQ15 for the dlog channels.

    you would have to change this back to IQ global to get into per unit, and then for the current or voltage you would have to multiply by the BASE_VOLTAGE and BASE_CURRENT to get a real world voltage.  It's not exactly straightforward. The point of the graphs for these projects was really to see the shape more than thte magnitude.