This paper describes an approach to design of brushless de motors considering the cogging torque reduction and running torque optimization to enhance the product robustness. The approach is based on Tawchi method and utilizes the orthogonal array for design of 'experiments', i.e. the scheme for numerical simulations using a finite element method. The concept of sienal-to-noise (SN) ratio is aDDlied to design target while keeping the product performance insensitive to the effects of noise factors that may be due to variability in manufacturing process or environmental conditions, The effectiveness of the technique was demonstrated In the design examples presented below. evaluate the mot& performance. A comparison is made between the robust solution and the result obtained using a conventional optimization procedure to demonstrate the effectiveness of the rohnst design approach.

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