A novel axial air-gap transverse flux switching PM generator: Design, simulation and prototyping

Abstract

Wind energy as the cleanest source of renewable energy requires a highly efficient lightweight generator that provides maximum power density while having the least vibration noise and maintenance. In this study, an axial air gap transverse flux machine is presented, and all excitation sources are located in the stator. This structure provides lower core loss, weight and cost due to the full utilisation of the permanent magnets, SMC-free structure and short magnetic flux path. In fact, by combining the features of a flux-switching machine into a transverse flux generator with an axial air gap, it is possible to improve the performance of a direct-drive wind turbine generator by overcoming traditional structures' challenges. To analyse the axial transverse flux switching permanent magnet generator performance characteristics, 3D finite element simulations have been performed, which have been validated by comparing them to the practical results of a single-phase prototype. The results are in agreement with an acceptable error that is caused by manufacturing uncertainties.