Sensorless direct FOC with Takagi-Sugeno Fuzzy controller for three-phase induction motor

This paper proposes a Takagi-Sugeno (T-S) Fuzzy controller to substitute the two PI current regulators present in conventional sensorless direct field oriented control (DFOC) scheme. The proposed controller calculates the reference quadrature components of the stator voltage vector in rotor-flux-oriented reference frame. The rule base for the proposed controller is defined in function of the stator current direct and quadrature component errors. Constant switching frequency and low torque ripple are obtained using space vector modulation technique. Performance of the proposed sensorless DFOC scheme with T-S fuzzy controller is analyzed in terms of rise time, settling time and torque ripple considering different operating conditions. The fast torque response and low torque ripple are obtained with the proposed scheme as is shown through numerical simulation results.