Design of a Novel Three-Phase Transverse Flux Disc Generator and Optimization of Cogging Torque

Abstract

Permanent magnet synchronous machines are more preferred in low-power direct-driven wind turbines. In addition to conventional machine topologies with axial and radial flux, special machine models have also been proposed in the literature such as transverse flux machine (TFM). In TFM's, due to their structural properties, electrical loading and magnetic loading are not directly related. The number of poles and magnetic loads can be easily increased. For this reason, TFM's stand out in high torque-low speed applications such as robot arms, electric vehicles, and wind turbines. In this study, a new three-phase transverse flux disc generator model is introduced. The operation principle and the electrical circuit model are explained. The back-emf waveform is obtained according to the rotor inner diameter of the proposed generator model using the Finite Element Method. The cogging torque is also studied as another design parameter. The high cogging torque, which is one of the general drawbacks of TFM's, has been reduced from 6 Nm to 0.38 Nm by using magnet skew method.

Keywords

• transverse flux
• disc generator
• finite element method
• cogging torque