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Does InstaSPIN FOC provide DC bus voltage control during dynamic breaking?

Townes Lee
Prodigy 40 points

When the PM motor is acting as a break (trying to slow down the RPM of the load it is carrying), the energy will feed back to the DC link capacitor.  Does InstaSPIN FOC control the breaking when the DC Bus voltage reach a user preset level so that you don't get a DC Bus Over Voltage Fault? 

In my application, I do not want to add a break controller on the DC bus to dump the energy on a breaking resistor.  What I want is a software solution that reduce or remove the breaking so that the DC bus does not go over voltage.  Can InstaSPIN FOC do that?

Thank you.

Townes

  • 0
    TI__Expert 4760 points
    Hello Townes,
    This is not a feature we currently have implemented in InstaSPIN. There has been some discussion about adding such a feature in the future, but judging by our current backlog of projects and features, it would probably be mid 2016 before we could productize such a feature.
    -Dave
  • 0
    Expert 1130 points

    Hi,

    It is quite easy to add an overvoltage protection on the DC bus. I have made it to prevent overvoltage during braking and it works fine. You just have to stop driving the motor when voltage is too high (with an hysteresis).

    Manu