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Fuzzy-Logic control of unsymmetrical two-phase induction motor

This paper proposes a closed-loop control strategy to operate an unsymmetrical two-phase induction motor (IM) as a symmetrical 2-phase motor using Fuzzy Logic (FL) control. The unsymmetrical two-phase IM is realized using an off-the-shelf single phase IM. The proposed control strategy employs constant air-gap flux control technique to independently control the stator currents of both the main and auxiliary windings of the two-phase unsymmetrical motor and make them follow a predefined sinusoidal waveform. Experimental results show that the proposed FL controller scheme is successful in operating the unsymmetrical two-phase IM as a symmetrical 2-phase motor with fast dynamic and transient response. Notably, the proposed control scheme achieves reduction in the inherent torque oscillations of the two-phase unsymmetrical IM, rendering its behavior similar to its symmetrical counterpart.