Speed Control of the Pentaphase Asynchronous Machine: Comparative Study Between Vector Control with Conventional PI and Fuzzy PI

Abstract

Controlling asynchronous machines is complex because of the non-linearity of the model and the coupling between stator and rotor quantities. Thanks to advances in power electronics, decoupled control techniques have been developed to reproduce the performance of DC machines, while eliminating mechanical constraints. However, in the case of polyphase machines, these control strategies remain limited due of the harmonics generated by the inverter, which degrade power quality. To address this issue, a new fuzzy logic control strategy is proposed, aimed at reducing parasitic currents and improving dynamic performance in a five-phase asynchronous machine. A comparison between vector control using conventional PI and fuzzy PI is considered, based on the dynamic responses of speed, torque and harmonic distortion rate, especially under load variations and during rotational reversals. The simulation results obtained in MATLAB demonstrate a significant enhancement in speed stability and a reduction in ripples, confirming the effectiveness of the proposed approach.