Design, modelling, simulation and implementation of vector controlled induction motor drive

The principle of vector control of an AC machine enables the dynamic control of AC motors, and induction motors in particular to a performance level comparable to that of a DC machine. The basic equations describing the dynamic behaviour of an induction machine in a rotating reference frame are detailed. Based on these equations the structure of the vector controlled induction motor drive is derived. A design procedure is developed for systematic design of the gain and time constant of various controllers. The procedure is evaluated through extensive computer simulation. The complex nature of the vector controlled scheme places a heavy computational burden on the controller. A digital signal processor (DSP) based controller is developed for this purpose. The power circuit is developed using insulated gate bipolar transistors (IGBTs). The performance of the vector controlled scheme is tested on a 40 HP prototype drive. The dynamic performance of the drive is extensively tested and the results are presented