Abstarct: Nowadays, brushless rotor permanent magnet (PM) machines are widely used in home electric devices, space aircrafts, military apparatus, wind generators and electrical vehicles. Beside many advantages, protecting the PM pieces of the rotor from centrifugal force is the major problem of PM machines. To overcome the problem, the stator PM machines were proposed. Amongst the stator permanent magnet machines, flux switching permanent magnet machines (FSPM) are interested due to rather high torque density and high efficiency. On the other hand, the high cogging torque is the main drawback of FSPM. The cogging torque has no effect on the average output torque but causes vibration and acoustic noise, and reduces the speed control accuracy .Some cogging torque reduction techniques are essentially baxsed on machine core shape optimization .These techniques improve the torque ripple but reduce the output torque. Some typical techniques such as rotor and stator teeth notching, rotor segments pairing, rotor curvature variations, inserting iron bridge in rotor, and rotor skewing may reduce the torque ripple while affecting the average torque and back-EMF waveform of SRFSPM motors. In this thesis, by full investigating of typical torque reduction techniques, an inventive approach is proposed that shows more reduction of torque ripple and no considerable changes in the other performance characteristics of SRFSPM motor