Optimum Design of Brush- Less DC Motor with Minimum Torque Pulsation Using FEM& PSO

despite many advantages of brush-less dc motor, torque pulsation is one of the most important disadvantages of it. at first, an optimum primary design of bldc motor is done using pso algorithm. then, other parameters for reducing the torque pulsation are considered by the finite element method. it is shown that the fractional slot structure has many advantages than the conventional one. both cogging and ripple torque have been reduced for the fractional structure. in the next steps, other important torque pulsation parameters, such as magnet embrace, offset and skew are considered. proper embrace, skew and offset are achieved for reducing the torque pulsation by the nonlinear finite-element analysis.