Vector control system makes an induction motor replace a high performance dc motor drive. Nowaday, the vector control of an induction motor is widely employed in industry application where a high performance torque control is required.
The basic concepts of the vector control is that the exciting current and torque current are controlled independently. The control of induction motor using the principle of vector control gives control characteristics similar to that of seperately excited dc motor. Crucial to the success of the vector control scheme is the knowledge of the instantaneous rotor flux. The vector control system and control error resulting from parameter variation which come from change in temperature and saturation is analized.
Analytic expressions are derived to calculate rotor flux from stator voltage, current and frequency. The experimental results are also presented. This vector control system is developed by making use of a single high speed 16-bit microprocessor (M68000).
