Digital simulation of low cost fuzzy logic based four-switch three-phase (PWM) inverter fed induction motor drive

In this paper performance analysis and MATLAB simulation of a fuzzy logic controller based cost effective drive system of a induction motor for high performance industrial drive systems is presented . In this paper the FLC is used as a speed controller and the motor is fed from a four-switch three-phase (4S3Ph) pulse width-modulation (PWM) inverter instead of a conventional six-switch three-phase (6S3Ph) inverter. This reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms and interface circuits to generate six PWM logic signals. Furthermore, the proposed control approach reduces the computation for real-time implementation. The robustness of the proposed FLC-based 4S3Ph-inverter-fed IM drive is verified by theoretically. A comparison of the proposed 4S3Ph-inverter-fed IM drive with a conventional 6S3Ph inverter system is also made in terms of performance and harmonic analysis of the stator current.