Toyota Jidosha Kabushiki Kaisha

Sinjiro Saigusa

Takeshi Hattori

Daisuke Okamoto

Toshimitsu Takahashi

Jung Hwan Hwang

Kohei Ishii

Naoki Iwata

Masashi Ohtsubo

Masashi Hara

Provided is a compressed powder core that can suppress a decrease in the inductance even when a high magnetic field (of greater than or equal to 40 kA/m) is applied to the compressed powder core while suppressing an iron loss and a decrease in the strength of the compressed powder core. The compressed powder coreA has soft magnetic particlesA and aluminum nitride layersA formed on the surface layers of the respective soft magnetic particlesA. The compressed powder coreA has a ratio of the first differential relative permeability &#x3bc;'L to the second differential relative permeability &#x3bc;&#x2032;H satisfying a relationship of &#x3bc;&#x2032;L/&#x3bc;&#x2032;H&#x2264;6, and has a magnetic flux density of greater than or equal to 1.4 T when a magnetic field of 60 kA/m is applied. The soft magnetic particles of the compressed powder coreA contain Si in the range of 1.0 to 3.0 mass % and have, when analyzed using XRD, a peak area ratio Sal/Sfe of greater than or equal to 4%, the peak area ratio Sal/Sfe being the ratio of the area Sal of a peak waveform derived from AlN to the area Sfe of a peak waveform derived from Fe.

Compressed powder core, powders for compressed power core, and method for producing compressed powder core

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Toyota, Japan

Sinjiro Saigusa