FLC based tuned PI controller for wide speed range operation of IPMSM drive

This paper presents a fuzzy logic controller (FLC) based tuned proportional-integral (PI) controller for interior permanent magnet synchronous motor (IPMSM) drive. The PI controller serves as the primary speed controller whose gains are tuned by a novel Sugeno type FLC. Thus, the limitations of traditional PI controllers are avoided and the performance of the drive system is improved. A flux controller is also incorporated in such a way that both torque and flux of the motor can be controlled while maintaining current and voltage constraints. The flux controller is designed based on maximum-torque-per-ampere (MTPA) operation below the rated speed and flux weakening operation above the rated speed. Thus the proposed drive extends the operating speed limits for the motor and enables the appropriate use of the reluctance torque. A performance comparison of the proposed IPMSM drive with conventional PI controller based drive is provided. Simulation results demonstrate the better dynamic response of the proposed drive over a wide speed range.