**5. Conclusions**

The main aim of this paper was to demonstrate that the performance of direct line connected induction motors can be improved by introducing an auxiliary stator winding supplied by a partial power inverter. The auxiliary stator winding features fewer turns than the main one, and thus has lower voltage and power ratings. However, if suitably controlled, the additional winding allows for the achievement of an effective power factor control and a compensation of torque oscillations produced by the mechanical load or by distorted utility grid voltages. Moreover, under certain conditions, it is possible to mitigate the line overcurrent occurring during the start-up of the induction machine. The proposed solution is expected to be mainly applied for medium–high power range motors, where the cost of the system could be more affordable.

**Author Contributions:** G.S. (Giacomo Scelba) and L.D.T. conceived the original idea. M.C., S.F. and L.D.T. developed the theory and performed the computations. A.T., G.S. (Giuseppe Scarcella), S.A.R. and S.D.C. verified the analytical methods. All authors discussed the results and contributed to the final manuscript. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work has been partially supported by the University of Catania under the interdepartmental project PIA.CE.RI. 2020–2022 Line 2-TMESPEMES.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.

#### **References**

