From transverse flux machine to fractional slot concentrated winding permanent magnet synchronous machine

The article presents the results of research on transverse flux machine (TFM) modifications that led to the development of the cogging machine (PMCM) concept and its further evolutions. The transformation process of the cogging machine from a multi-segment to a single-segment modular design has resulted in a structure identical to the known and commonly used fractional slot concentrated winding permanent magnet synchronous machine (FSCW-PMSM). The paper describes the features gained and lost by the modified machine in various transformation stages. An original method for selecting the number of winding modules is also proposed, depending on the number of coils in a module and the pitch of the pole using a separating tooth between the modules.