Comparative study of vector control methods for induction machines

Different vector control methods (field oriented control-FOC, field acceleration method-FAM, universal field oriented-UFO, direct self control-DSC and the Takahashi method among others) are compared analytically. It is shown that they can be divided into two groups: quadrature control and slip control. The slip control methods, when based on the stator or airgap flux, are approximations only valid for steady state conditions. On the other hand, the quadrature control methods and the rotor flux-based slip control methods are theoretically exact. Finally, the influence of parameter variations in the quadrature control methods is evaluated using simulations