A Hybrid-Excited Flux-Switching Machine for High-Speed DC-Alternator Applications

TLDR

The study introduces a hybrid‑excited flux‑switching machine with stator‑slot excitation coils. The authors model a three‑phase hybrid‑excited flux‑switching machine, simulate its electromagnetic performance with finite‑element analysis, build a 12‑pole prototype, and experimentally validate its operation and thermal behavior. The machine achieves controllable air‑gap fields and maintains thermal stability up to 12,000 rpm, indicating suitability for high‑speed applications.

Abstract

This paper presents a new topology of hybrid-excited flux-switching machine with excitation coils located in stator slots (or inner dc windings). After describing the three-phase structure to be investigated, the working principle is discussed, and the main electromagnetic performances are simulated by finite-element (FE) analysis. It is demonstrated that the air-gap field can be easily controlled, which is interesting for variable-speed applications. Finally, a prototype having 12 stator poles and different rotor tooth numbers (10 or 14) was built. Experiments were performed, validating the FE simulations and the operation principle. Finally, the thermal behavior of the prototype machine is investigated through experiments. It is shown that, up to 12 000 r/min, the thermal stabilization is achieved, making this topology an excellent candidate for high-speed applications.