Aiming at the issue of the traditional local optimization method of permanent magnet motor can not achieve multiobjective optimization

an optimization method based on Taguchi method is proposed. By using Taguchi method

air gap length

pole arc coefficient

permanent magnet thickness

stator tooth width and slot width of the fractionalslot concentrated winding permanent magnet synchronous motor are optimized

which makes performances including efficiency

cogging torque

torque produced by unit mass permanent magnet of the motor optimum. The orthogonal matrix is established according to the Taguchi orthogonal experiment. Combining with statistics

the influences of each optimization variable on the optimization objective are analyzed

and the optimal combination of multiple optimization factors are obtained at finally. Twodimensional transient field of the optimized motor is analyzed by using the finite element method

the magnetic field distribution and relevant characteristics of the motor under load conditions are obtained. Experimental data and related analysis show that the Taguchi method is suitable for the optimal design of fractionalslot concentrated winding permanent magnet synchronous motor

and can effectively suppress the cogging torque of the motor.