Magnetic core and magnetic component
In a magnetic core including a core assembly formed of multiple arranged thin strip blocks, each of the thin strip blocks has a structure that multiple nanocrystalline thin strips having a bcc-Fe phase as a main phase are laminated one above another, and an iron loss in the nanocrystalline thin strip positioned at a center of the thin strip block in a thickness direction thereof is lower than an iron loss in the nanocrystalline thin strip positioned in a surface layer of the thin strip block. The nanocrystalline thin strip may be a heat-treated product of an amorphous thin strip made of an amorphous alloy material, and the thin strip block may include a fixedly joined portion in which the nanocrystalline thin strips adjacent to each other in a lamination direction are fixedly joined together.
1. A magnetic core comprising:
a core assembly including a plurality of thin strip blocks assembled together, each of the thin strip blocks being a laminated body formed of a plurality of nanocrystalline thin strips laminated along a lamination direction,
wherein the plurality of nanocrystalline thin strips are made of a nanocrystal-containing material having a bcc-Fe phase as a main phase,
wherein each of the plurality of thin strip blocks includes:
fixing portions in which the plurality of nanocrystalline thin strips are joined to each other in the lamination direction, such that the fixing portions electrically connect the plurality of the nanocrystalline thin strips within the thin strip blocks, while the plurality of the thin strip blocks are electrically separated from each other,
and wherein the nanocrystalline thin strip positioned at a center portion of the thin strip block in the lamination direction has an iron loss smaller than an iron loss of the nanocrystalline thin strip positioned at a surface of the thin strip block.
2. The magnetic core according to claim 1 , wherein the nanocrystalline thin strip is a heat-treated product of an amorphous thin strip made of an amorphous alloy material.
3. The magnetic core according to claim 1 , wherein the plurality of nanocrystalline thin strips are fusion-bonded to each other in the fixing portions.
4. The magnetic core according to claim 3 , wherein the fixing portions are laser welded portions.
5. The magnetic core according to claim 1 , wherein the plurality of thin strip blocks are arranged along a first direction in such a manner that fixing portions of the plurality of thin strip blocks are not aligned in the first direction.
6. The magnetic core according to claim 1 , further comprising:
an impregnated coating covering the core assembly.
7. A magnetic component comprising the magnetic core according to claim 1 .
8. The magnetic core according to claim 1 , wherein the plurality of thin strip blocks are stacked on one another along the laminating direction of the plurality of nanocrystalline thin strips.
9. A magnetic core comprising:
a core assembly including a plurality of thin strip blocks assembled together, each of the thin strip blocks being a laminated body formed of a plurality of nanocrystalline thin strips laminated along a lamination direction,
wherein the plurality of nanocrystalline thin strips are made of a nanocrystal-containing material having a bcc-Fe phase as a main phase,
wherein the plurality of thin strip blocks are engaged with one another along a circumferential direction perpendicular to the laminating direction of the plurality of nanocrystalline thin strips,
and wherein the nanocrystalline thin strip positioned at a center portion of the thin strip block in the lamination direction has an iron loss smaller than an iron loss of the nanocrystalline thin strip positioned at a surface of the thin strip block.