Design and analysis of a dual-mode flux-switching doubly salient DC-field magnetless machine for wind power harvesting

This study proposes a new dual-mode flux-switching doubly salient DC-field (FS-DSDC) machine for the wind power harvesting applications. The key distinction of the proposed machine is to artfully incorporate the design concepts of two machines, namely, the flux-switching DC-field (FSDC) and the DSDC machines together. By regulating the winding configurations, the proposed machine can behave similarly as the corresponding machines do and hence achieving the dual-mode operations, namely, the FSDC mode and DSDC mode, to offer higher flexibility and stability for different wind situations. The proposed machine can utilise its external DC-field winding to tune its flux density effectively, hence providing the constant-voltage charging function at various wind speeds and loads. The corresponding performances of the proposed machine are analysed by using the finite element method and verified by experimental results.