6. Conclusion

Advances in electrical machine modelling, power electronics, automatic control and digital microprocessor systems have made it possible to use stator or rotor flux orientation techniques to provide the asynchronous cage machine with the static and dynamic performance required to meet the demands of variable-speed drives in terms of reliability, maintainability and availability. One of the most firmly established correlations within a variable-speed drive, now modernized thanks to vector control, is undoubtedly that between the machine and the converter, and the way it is controlled.