Numerical research on heat transfer in motors based on the orthogonal experiment

The orthogonal experiment method was adopted to study the influence of the geometric parameters of the fins around the motor shell on the overall heat dissipation performance of the motor. The study showed that the key factors that influence the maximal temperature in the motor shell are, respectively, the fin pitch, the fin thickness and the fin height with their sensitivities decreasing in sequence. It was found that with the increase in the fin thickness or the fin height, the maximum shell temperature decreases first and then increases. As for the fin pitch, however, the maximal shell temperature increase monotonously with the fin pitch. The optimal fin structure was determined as the fin height of 85 mm, fin thickness of 8 mm and fin pitch of 25 mm. Besides, it was also indicated that the effect of the fin thickness on the total convective heat transfer surface is negligible, and the fin pitch is the most sensitive factor that influences the turbulence intensity.