Study and implementation of a simplified and efficient digital vector controller for induction motors

This paper deals with the analysis and the implementation of a rotor flux oriented torque control for induction motors which utilises stator flux components as controlled variables. Combining the advantages of rotor flux orientation and stator flux space vector control leads to a high performance drive using a simple control scheme without the requirement for speed or position feedback. The strategy adopted needs neither the rotor resistance of the machine nor the co-ordinate transformation based on the rotor flux position. A simulation program has been developed in order to examine the behaviour of the overall drive system. The numerical results obtained in steady state and transient conditions confirm the expected drive performance. Some experimental results are also given.