Fuzzy logic controller based cost effective 4-switch, 3-phase inverter fed IPM synchronous motor drive system

This paper investigates the performance of a fuzzy logic controller (FLC) based cost effective drive system of interior permanent magnet synchronous motor (IPMSM) for high performance industrial applications. In this work, the FLC is used as a speed controller and the motor is fed from a 4-switch 3-phase (4S3Ph) PWM inverter instead of a conventional 6-switch, 3-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 6 PWM logic signals. Furthermore, the proposed control approach reduces the computation for real-time implementation. The closed loop vector control scheme of the proposed 4S3Ph inverter fed TPMSM drive incorporating the FLC is implemented in real-time using digital signal processor (DSP) TI TMS320C31 for a prototype 1 hp motor. The robustness of the proposed FLC based 4S3Ph inverter fed IPMSM drive is verified by theoretical and experimental results at different operating conditions. A comparison of the proposed 4S3Ph inverter fed IPM drive with a conventional 6S3Ph inverter system is also made in terms of performance and harmonic analysis of the stator current. The proposed inverter fed IPMSM drive is found quite acceptable considering its performance, cost reduction and other inherent advantageous features.