发明名称 |
Dust core and method for producing the same |
摘要 |
There are provided a dust core in which, even if the surface of a heat-treated compact is ground, the insulation between soft magnetic particles on the ground surface can be ensured in the grinding step, and a method for producing the dust core.;The method includes a preparation step of preparing a heat-treated compact 100 by compacting soft magnetic particles having an insulation coating and heating the resultant compact to a predetermined temperature; and a machining step of removing part of the heat-treated compact 100 using a working tool 2. The machining step is performed while an electric current is supplied with a conductive fluid 7L between the heat-treated compact 100 serving as an anode and a working tool 2 that machines the heat-treated compact 100 or a first counter electrode 5 that faces the working tool 2 with a distance therebetween, the working tool 2 or the first counter electrode 5 serving as a cathode. A bridge portion that connects soft magnetic particles to each other is removed through the supply of an electric current, the soft magnetic particles being adjacent to each other along a machined surface of the heat-treated compact 100. |
申请公布号 |
US8878642(B2) |
申请公布日期 |
2014.11.04 |
申请号 |
US201113502985 |
申请日期 |
2011.05.16 |
申请人 |
Sumitomo Electric Industries, Ltd. |
发明人 |
Ueno Tomoyuki;Nishioka Takao |
分类号 |
H01F27/24 |
主分类号 |
H01F27/24 |
代理机构 |
Ditthavong & Steiner, P.C. |
代理人 |
Ditthavong & Steiner, P.C. |
主权项 |
1. A dust core obtained by compacting soft magnetic particles having an insulation coating, the dust core comprising:
a machined surface on at least part of an outer peripheral surface of the core, the machined surface being formed by removing part of the core with a working tool, wherein soft magnetic particles that are adjacent to each other along the machined surface are isolated from each other through an insulation coating on the machined surface. |
地址 |
Osaka JP |