AUTHOR : Su-Jin Lee, Jung-Pyo Hong
ORGANIZATION : ISAMMA 2013
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YEAR : 2013.7
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This paper deals with finding the optimal ratio of height and width of notch to reduce the torque ripple for outer rotor type Brushless DC motor using polar anisotropic ferrite bonded permanent magnet. In the proposed design method, the optimal notches are put on the inner stator face, which have an effect on the air gap flux density and shape. Through the space harmonic field analysis, the position and size of notches are found, in the case of polar anisotropic bonded PM orientation, due to the complicated magnetic field, the magnetizing direction cannot be determined by simple relational equations. Accordingly, for effective analysis, the characteristics of BLDC motor analyzed by using the finite element method (FEM) for unusual magnetic-field analysis coupled with optimal design methodology. In the optimal design, response surface method (RSM) is applied and considers the notches in the stator pole face as the only design factor. The validity of the proposed method is confirmed by experiments.