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TMS320F280041C: MotorControl SDK current sensing

Pavlin Stoyanoff
Expert 1715 points
Part Number: TMS320F280041C


Tool/software:

Greetings! I am using MotorControl SDK 5_03. My final project is based on Lab07. I am using an observer in order to calculate some sort of a current values which can be use as displayed value or over current and thermal protection. I`ve noticed that in spite of fact that the calibration is done every time there is a difference in the 3 currents(I am using 3 current and 4 voltage sensors). For example one of them is less from the othere 2. Is this effect caused by the vector control?

All my drivers have fault detection (on the IGBT bridge) so I can send short circuit. Do I have to add a protection for current difference beween the phase -> ground breach protection? If the vector control can cause difference in the consumption(which is logical because it should control the moment of the motor, not the state of the passed phase), should I remove this protection? Or how is done this in vector control? What could be the permittable difference? As I said I can sense short ciruit on the brigde, but just to be sure...

Thanks!

  • 0
    TI__Guru** 115500 points
    Pavlin Stoyanoff said:
    Do I have to add a protection for current difference beween the phase -> ground breach protection?

    That depends on the requirements you want. You can add the protections for each phase, ot just add the protection for dc-bus current.

    Pavlin Stoyanoff said:
    Or how is done this in vector control? What could be the permittable difference?

    The phase current is AC sinusoidal value that is always variable between positive peak to negative peak. The protection is for over current fault, not short fault.