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FOC: Switching from wye to delta

Discussion in 'Embedded' started by Markus Fuchs, Aug 11, 2008.

  1. Markus Fuchs

    Markus Fuchs Guest

    I've a design that drives wye-/star-connected PM synchronous motors by means
    of field oriented control (FOC). I'm wondering what has to be modified in
    order to make it work with delta-connected motors as well.

    My literature says that a wye-delta reconfiguration introduces a phase shift
    of 30 electrical degrees in the DQ model meaning that the "motor control
    must be adapted accordingly".

    What parts of the motor control has to be adapted accordingly? My wild guess
    is that the park transform has to be modified. Does that mean the following
    two (park transform) equations (to be found in every textbook of motor
    control) are only valid for wye configuration?

    Id = Ialpha*cos(theta) + Ibeta*sin(theta)
    Iq = -Ialpha*sin(theta) + Ibeta*cos(theta)

    Markus Fuchs, Aug 11, 2008
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