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Magnetic Field Analysis of Linear Brushless Doubly-Fed Machine

The linear brushless doubly-fed machine (LBDFM) is a special machine type with complex magnetic fields. To understand its operating principles, this paper develops an analytical magnetic field model and studies the magnetic fields in the air gap for the LBDFM. The proposed model is validated by comparison with 2-D finite element model (FEM). After analyzing the magnetic fields modulated by the nested-loop structure on the secondary, the influence of the end effect on the machine performance is investigated. It indicates that the end effect has different impacts on different winding space-harmonic components. Finally, the developed analytical magnetic field model is used to analyze the operating principles of the LBDFM.