Effect of Pole Shaping on Cogging Torque, Torque Ripple and Vibrational Performance in Consequent Pole TFM

Cogging torque is a major drawback for Transverse Flux Machines (TFM) since the stator tooth span is approximately equal to a pole span. Hence, cogging reduction by conventional techniques such as skewing is inefficient, and fractional-pitch winding is unavailable. The effect of cogging torque will get carried to the torque ripple content of the three-phase TFM. In this paper, the cogging torque, torque ripple and vibrational performance for a proposed consequent pole TFM are analyzed and an electromagnetic design-based solution for addressing this issue is presented.