The principle of vector control of 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
detsiled. Based on these equations the structure of the
vector controlled induction motor drive i-rived. 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 plsces a heavy computational burden on the
con troller. 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 40hp prototype drive.
The dynamic performance of the drive is extensively
tested and the results are presented.