rotor flux estimation for vector control

Discussion in 'General Electronics Chat' started by kokkie_d, Jan 11, 2012.

  1. kokkie_d

    Thread Starter Active Member

    Jan 12, 2009

    I am having the following problem: I worked my way through variou books and papers to model an induction motor and a basic indirect vector control scheme (using clarke and park transform etc).
    Now, all is reasonably clear but 1 thing: how is the rotor flux value estimated.
    It is my understanding that this value is a constant and non zero (in a permanent magnet synchronous machine this value can be set to zero).

    I use a basic speed PI controller to calculate the iq_ref but how would I calculate id_ref for which I would need the rotor flux?

    I hope there is someone how can help me.