An adaptive filter based torque ripple minimization of a fuzzy logic- controller for speed control of a PM synchronous motor

This paper presents an adaptive filter based torque ripple minimization (TRM) of a fuzzy logic controller (FLC) for speed control of an interior permanent magnet synchronous motor (IPMSM) drive. A simple and effective first order digital infinite impulse response (IIR) filter is utilized to reduce the torque ripple introduced by the FLC. The gain of the filter is adapted online based on the magnitude of the torque ripple. The optimal position of the filter in the complete drive is also determined for effective TRM. The various sources of torque pulsations in a practical electric machine drive are described. The main cause of the torque ripple in an FLC is also explained. A simulation model for closed vector control of an FLC based IPMSM drive incorporating the proposed TRM technique is developed in Matlab/Simulink. The effectiveness of the proposed technique is investigated extensively in simulation at different operating conditions. It is found that the performance of the FLC based IPMSM drive is improved significantly with the proposed TRM technique.