Harmonic filter design for line start permanent magnet synchronous motor

The rising preference of permanent magnet synchronous motors (PMSM) over the induction motor (IM) due to its high efficiency, better power factor, power to weight ratio is quite evident in recent industrial trends. The presence of permanent magnets in the rotor initiates the problem of motor harmonics, giving rise to harmonic currents and operational noise of the motor. Considering this problem, a suitable alternative to reduce the harmonics existing in the line start permanent magnet synchronous motor (LS-PMSM) is suggested in this paper.