Design of A Doubly-Fed Linear Motor Based on Three-Phase Stator and Five-Phase Mover for High-Speed Maglev Applications
The high-speed maglev train based on the doubly-fed linear motor (DFLM) has the potential advantages to achieve suspension, traction, and contactless power transfer simultaneously, which improves the reliability of the maglev system and system cost. However, there is still a lack of relevant designs of the doubly-fed linear motor to meet critical requirements for practical high-speed maglev applications, e.g., the low fluctuations of the levitation and thrust forces. In this paper, based on the performance of the German TR08 maglev train, finite element analysis (FEA) technology is used to investigate the effects of different pole-slot combinations and multi-phase winding structures on the suspension force and thrust force of the doubly-fed linear motor. A doubly-fed linear motor topology based on 36-slot 12-pole three-phase stator and 20-slot 12-pole five-phase mover is proposed, which can greatly reduce the fluctuations of suspension and thrust forces, and its performance is close to the level of TR08 maglev train. Finally, the performance of the contactless power transfer for the DFLM is analyzed.
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