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Can I use DRV8432 as three-phase motor controller?

Sang-il Nam
Expert 2520 points
Other Parts Discussed in Thread: DRV8332

Hi,

Are there any special reasons for below? (about red square box)

Can I use DRV8432 as three-phase motor controller?

Or is there a reason that can not use it?

  • 0
    TI__Guru** 114905 points
    Hi Nam, Sang-il,

    The DRV8332 is a better fit. The DRV8432 has only two reset pins, making it difficult to control the three phases separately.
  • 0 in reply to Rick Duncan
    Expert 2520 points

    I appreciate your quick reply, but what I was asking for was the possibility of the three-phase control on DRV8432.
    I think that If not use 1-phase, can control 3-phase motor by DRV8432.
    Are there any problems for above usage?
    It is absolutely impossible? or difficult, but it can be.
    Which one is right?

    I just wonder why the three-phase PMSM diagrams have been deleted from the datasheet.

    Is the technical issue?

    Thanks.

  • 0 in reply to Sang-il Nam
    TI__Guru** 114905 points
    Hi Nam, Sang-il,

    Using the DRV8432 can be done, but it depends on the algorithm.

    If you intend to use a trapezoidal algorithm, it is not possible. This is because of the lack of independent control of the enables.

    If you intend to use sinusoidal algorithm, it is possible. This requires use of external circuits to measure the current.

    As previously mentioned, the DRV8332 is a better choice. The DRV8332 allows experimentation with both trapezoidal and sinusoidal algorithms. An lower current evaluation module ( www.ti.com/.../drv8312-c2-kit ) is available.
  • 0 in reply to Rick Duncan
    Expert 2520 points
    Thank you for your response and your kind words.

    If the point of the problem is due to 'Delay for sequencial enable port control', DRV8432 may be used at three-phase trapezoidal algorithm too, if I do not take the gate control algorihm by enable port control.

    Am I right in thinking that if the enable port(RESET_AB, RESET_CD) left in active state(logic high) and only control PWM input port, DRV8432 can handle three-phase trapezoidal algorithm?
  • 0 in reply to Sang-il Nam
    TI__Guru** 114905 points
    Hi Nam, Sang-il,

    My understanding is that you cannot drive trapezoidal with the DRV8432. RESET_AB controls both OUTA and OUTB. There is no ability to set one floating while driving the other.

    Trapezoidal algorithms typically have one phase floating while the other two are driving. To drive OUTA and OUTC, both RESET_AB/ and RESET_CD/ must be a logic 1. This will cause OUTB to also be active. There is no ability to disable OUTA without disabling OUTB, or disabling OUTB without disabling OUTA.
  • 0 in reply to Rick Duncan
    Expert 2520 points
    Ok, I fully understand it.
    Thank you for your technical support and your kind words.