| 摘要 |
PROBLEM TO BE SOLVED: To improve the characteristics of a motor by integrating a projecting core part and a flat annular yoke by a molding that is made of the mixture of two kinds of soft magnetic powder with different particle diameters. SOLUTION: By mixing two kinds of powder with drastically different particle diameters, the occupation rate of a yoke 11 that is selected finally is improved drastically, permeability and saturation magnetic flux density are improved, magnetic flux being generated by a coil 13 is increased, and motor characteristics can be improved. Powder (powder A1) obtained by crushing the water atomization rough particle powder in Fe-Si-Al alloy composition and the water atomization fine powder (powder B1) in Fe-S1-Al alloy composition are used as powder A and power B, respectively. The powder Al is annealed in hydrogen at 950 deg.C after grinding, the most frequent value of the grain size of the powder A1 is ranked at 44-62μm, and the center value 53μm becomes the most frequent value of the powder Al. The powder B1 is used after it is subjected to water atomization and then dried.
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