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A novel Integral-force technique for the analysis of an axial-field permanent-magnet brushless DC motor using FE method

In this paper, a novel integral-force technique to calculate the developed torque of an axial-field permanent-magnet brushless dc (PM BLDC) motor using minimum requirement of two-dimensional (2-D) finite-element (FE) analyses is presented. Using this method, the designer can find out the actual performance of the axial-field PM BLDC motor using 2-D FE analysis rather than a three-dimensional (3-D) FE analysis. The design data of a 70 W, three-phase, 24 V, 6 pole, 350 rpm axial-field PM BLDC motor designed using a developed computer-aided design program have been used to work on the developed torque using the proposed new method as well as using 3-D FE analysis. The peak torque calculated in 3-D FE analysis is 2.2608 Nm as against the 2.2705 Nm obtained from the integral-force technique.