Producing Microscopic Permanent Magnet with Rapid Cooling Method(<Special Issue>Asia-Pacific Symposium on Applied Electromagnetics and Mechanics(APSAEM10))
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Purpose of this study is to develop Nd-Fe-B microscopic permanent magnet wires by using rapid cooling techniques for applications in micro magnetic actuators. The Nd-Fe-B permanent magnets have been contributed to improve efficiency of electrical machines and magnetic actuators and to miniaturize their size and weight. Recently use of Nd-Fe-B based permanent magnets in micro machines is also paid attention to improve moving performance such as increasing torque and reducing energy losses. Our target is producing a 0.2mm diameter wire shape permanent magnet directly by using a spinning method in rotating liquid. Composition of mother alloy is Nd_6Fe_<79>B_<15> at.%. A ribbon sample was also made by single-role process in argon atmosphere for comparison. The magnetic property of the ribbon showed hard magnetic property. Referring this result, we produced Nd-Fe-B based wires with the spinning method in rotating liquid. The oxidation of Nd and cooling rate of melt jet affected the coercive force.
- 日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics
日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics 19(Supplement), S57-S62, 2011-09-10