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This book investigates the minimization of torque ripples and harmonic noises in PMSM generated due to inverter switching system. In order to reduce torque ripples and harmonic noises in PMSM, three different methods have been proposed: a new dissipative passive filter topology to reduce torque ripples and harmonic noises in PMSM derived by FOC and HDTC algorithms have been proposed.In the second method an active filter topology have been proposed. The third method describes a new direct torque control algorithm for interior permanent magnet synchronous motor to improve the performance of hysteresis direct torque control (HDTC).The simulation results of this proposed algorithm show adequate dynamic torque performance and considerable torque ripples reduction as well as lower harmonic current and lower EMI noise level as compared to HDTC. These simulation resuls are supported by expeimental work
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