Abstract
Currently, studies of flux switching machines are actively underway owing to several advantages of these machines, including their sturdy rotor structure and high output capability. This paper deals with an outer-rotor hybrid-excited flux-switching machine (FSM). The proposed machine embraces a homopolar structure and utilizes permanent magnets (PMs) for field excitation and a high-temperature superconducting (HTS) coil for flux regulation. The stator houses the HTS field coil, PMs, and armature windings. The outer rotor consists solely of an iron core. Thus, the machines are cost effective and can serve as a solution to the design and fabrication complexities of field current supplying and cooling systems. In this paper, the machine performance outcomes are analyzed using the 3D finite element method (FEM), and the validity of the proposed machine is verified.
Highlights
In many variable-speed rotating synchronous machine applications such as aircraft, electric propulsion, and wind turbines, constant output operation is required [1,2,3]
The main magnetic flux is generated by the permanent magnets (PMs) and switching of the field polarities in the rotor tooth, for the rotating magnetic field is realized through the flux-switching topology
This paper primarily focused on the proposal of a new topology for outer-rotor hybrid-excited flux-switching machine (FSM) and its design
Summary
In many variable-speed rotating synchronous machine applications such as aircraft, electric propulsion, and wind turbines, constant output (torque or voltage) operation is required [1,2,3]. The main magnetic flux is generated by the PMs and switching of the field polarities in the rotor tooth, for the rotating magnetic field is realized through the flux-switching topology It adopts HTS coil excitation and homopolar topology for flux regulation. All components such as armature winding, HTS field coil, and PMs, except outer-rotor, are located in the inner stator. The HTS field coil can create a very high field compared to a conventional copper coil, further enhancing the flux regulation capability This hybrid excitation topology makes the machine more attractive. This paper primarily focused on the proposal of a new topology for outer-rotor hybrid-excited FSM and its design. The performance comparison results of initial and improved design were summarized
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