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TMS320F28P650DK: Speed control with speed ref = 0Hz doesn't work

David Blanc
Prodigy 200 points
Part Number: TMS320F28P650DK


Hi,

I am using the Universal Motor Control Lab project to spin my motor. The speed control seems to work well until 0.1Hz (0.4rpm), but it still spins (in opposite direction) when I apply a speed ref of 0Hz.

I have tested with the FAST estimator and with my encoder (angle value without noise). I need that to be able to implement the position control.

Thank you in advance for your support,

David

  • 0
    TI__Genius 11076 points

    David,

    The Universal Motor Control Lab does not have built-in support for 0Hz speed target. The FAST estimator is fundamentally based on the idea that the Back-EMF voltage can be utilized to determine position data- because there's no BEMF at 0Hz by definition, FAST has no information at 0Hz. In the Universal Lab, I think that the BRAKE_ENABLE predefine might be worthwhile to look into as an example of the system being forced to 0Hz.

    Regards,
    Jason Osborn