Abstract
Two magnetless double-rotor (DR) dual-mode machines, namely the DR DC-excited multi-tooth switched reluctance (DR-DC- MSR) machine and the DR ∞ux-switching DC (DR-FS-DC) machine, are proposed for special direct-drive applications where two rotating bodies are required to operate independently. Both machines can ofier two difierent operation modes, namely the doubly-salient DC (DSDC) mode and MSR mode, normal and fault-tolerant operations, respectively. With the independent armature windings, both machines are able to couple their two rotors with two rotating bodies operating at various speeds. The proposed machines are designed and analyzed by using the time-stepping flnite element method (TS-FEM). The simulation results conflrm the validity of the proposed machines.
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