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dq windings in ac machines

This animation illustrates the representation of an ac machine by means of equivalent dq windings acting in a common reference frame. The starting step is the machine model in which the stator windings are located in the stationary stator frame and the rotor windings in the rotor frame rotating at ω_m; the mutual magnetic coupling depends on the angle θ. The transformation into a common reference frame rotating at ω_k creates equivalent dq windings whose magnetic couplings are now independent of Θ but where speed voltages are generated by fluxes acting orthogonally. Special cases of dq  reference frames are : the stator frame (ω_k = 0) and the rotor frame (ω_k = ω_m).

 © M. Riaz