Simulation of a Rotor Flux Oriented Induction Motor Drive

The synchronously rotating vector components of the stator current isq and isd are controlled independently to control the torque and the rotor flux, respectively. It can be shown that rotor flux orientation in contrast to stator flux orientation tends to give true decoupling control. Within the synchronous current, the respective counter EMF (Electro Motive Force) signals can be added (or subtracted) to enhance the current loop response. The unit vector signal thetas that transforms the synchronously rotating stator voltage into stationary frame signals has been generated from the speed signal and slip signal which is a function of isq.