A coreless axial flux‐switching generator for micro‐wind turbine application

Abstract

AbstractThe efficiency, power density, and torque of axial flux generators are higher than those of radial flux generators. In this paper, a new axial flux switching generator with a coreless stator is designed for micro wind turbine applications. Generator parts are designed based on nominal values, and their dimensions are determined. Cogging torque is an undesired torque ripple intrinsic in the design of a permanent magnet generator, which should be minimized due to its effects: vibration and noise. In addition, since aerodynamic power is low during start‐up at low wind speeds, the cogging torque must be as low as possible to achieve a low cut‐in speed. The design, optimization, and fabrication of a new coreless axial flux‐switching generator for micro‐wind turbine application are investigated and compared with the conventional one. The prototype machine is an axial‐field flux‐switching permanent magnet generator with a two‐rotor‐one‐stators configuration. The stator of the proposed generator is made up of coils and magnets and has no iron core. First, the generator's design to reduce cogging torque is investigated using nominal values, and the dimensions of the various parts of the generator are calculated according to these values. Then the designed generator was simulated three‐dimensionally using the FEM. Finally, a prototype of the desired generator is built. Comparing the results obtained from the finite element method and laboratory testing shows that these results are broadly consistent.