The equivalent magnetic circuit method for designing the sinusoidal interior permanent magnet synchronous motor to obtain the basic parameters of the electromagnetic designing is detailed. It presents the usage of the taguchi method to optimal design the permanent magnet synchronous motor（PMSM）, and details the optimal parameters and its constrain, reference parameters considering the error caused by the processing technic, built the experimenting orthogonal matrixes used by the taguchi method. Then solved the arrays by finite element method（FEM）, analyzed the tendency and ratios of the affect of the motor＇s performance index caused by the variable of the optimal parameters, then obtained the rules of selection and the optimized parameters based on the multi-objective optimization of the motor design. The results of FEM verify the validity of this method.%详细推导了利用等效磁路法确定内嵌式正弦波永磁同步电机设计基本电磁参数；提出Taguchi参数优化设计方法用于永磁同步电机的多目标优化设计，详细分析了Taguchi方法所用的优化参数和取值范围、考虑加工工艺等引起误差的参考参数以及建立实验正交矩阵；利用有限元分析软件求解实验矩阵，分析优化参数改变对电机性能指标影响的变化趋势及比重，得出电机多目标优化设计的选择规律。有限元分析结果验证了该方法的有效性。
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