Reduced iron (Fe) nanoparticles and sintered Fe nano-polycrystalline were used for core inductor of axial-gap generator. Property on magnetization of core inductor at low frequency was investigated. Reduced Fe nanoparticles were produced from iron oxide fine particles by high voltage pulse or laser ablation in liquids. Core inductors with these materials were fabricated. It was clarified from the measurement for magnetization of core inductor that the relative permeability of the sintered Fe nano-polycrystalline was 1 million. These experiments show that core inductor can be thinner and lighter than those using conventional core materials. Using Fe nano-polycrystalline should make axial-gap generator more compact with keeping high efficiency.
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