On the single-sided transverse flux machine design

The transverse flux (TF) machine has an excellent torque-to-volume ratio in comparison to conventional machines. For this reason, the TF machine is well suited for direct drive systems. The electromagnetic design procedure of a TF machine consists of two main parts. In the first part of this article the main dimensions, parameters, and performance are estimated. In the second part, the magnetic circuit is optimized and the steady-state characteristics are computed by using a three-dimensional finite element method (3D-FEM) analysis. In this article, a comprehensive coverage of the first part of a TF machine design procedure is given, taking into account the already reported results and the existing experience. The sizing equation is obtained and the estimation procedure is applied in an example, resulting in a fully designed TF machine. The present work can serve as a guideline for a TF machine designer who wants to have a first machine estimation.