Reactor, converter, and power conversion device

1 . A reactor comprising:

a coil including a first winding portion; and

a magnetic core,

wherein the magnetic core includes:

a middle core arranged inside the first winding portion,

a first end core facing a first end face of the first winding portion,

a second end core facing a second end face of the first winding portion,

a first side core that is arranged outward of a first side face of the first winding portion and connects the first end core and the second end core, and

a second side core that is arranged outward of a second side face of the first winding portion and connects the first end core and the second end core,

the first end core includes:

a first outer face separated from the first end face in an X direction, and

a first recessed portion provided in the first outer face,

a cross-section of the first recessed portion orthogonal to a Z direction has a rectangular shape,

in a plan view of the magnetic core from the Z direction, the first recessed portion is located in a central portion of the first end core with respect to a Y direction,

in a plan view of the magnetic core from the Z direction, a width of the first recessed portion in the Y direction, which is defined as a width of an opening of the first recessed portion between two inner wall faces facing each other in the Y direction, is 40% or more and 80% or less of a length of the middle core in the Y direction, and a depth of the first recessed portion in the X direction, which is defined as a distance from the opening of the first recessed portion to a bottom face thereof, is 50% or more and 66% or less of a length of the first end core in the X direction,

the X direction is a direction conforming to an axial direction of the middle core,

the Y direction is a direction in which the middle core, the first side core, and the second side core are side-by-side, and

the Z direction is a direction orthogonal to the X direction and the Y direction.

2 . The reactor according to claim 1 ,

wherein in a plan view of the magnetic core from the Z direction, the first recessed portion fits within a range corresponding to the length of the middle core in the Y direction.

3 . The reactor according to claim 1 ,

wherein the first recessed portion is shaped as a groove extending along the Z direction.

4 . The reactor according to claim 1 ,

wherein the magnetic core includes a plurality of core pieces, one of the core pieces is a first core piece that includes at least the first end core, and

the first core piece is a powder compact made of a raw material powder that contains a soft magnetic powder.

5 . A reactor comprising:

a coil including a first winding portion; and

a magnetic core,

wherein the magnetic core includes:

a middle core arranged inside the first winding portion,

a first end core facing a first end face of the first winding portion,

a second end core facing a second end face of the first winding portion,

a first side core that is arranged outward of a first side face of the first winding portion and connects the first end core and the second end core, and

a second side core that is arranged outward of a second side face of the first winding portion and connects the first end core and the second end core,

the first end core includes:

a first outer face separated from the first end face in an X direction, and

a first recessed portion provided in the first outer face,

a cross-section of the first recessed portion orthogonal to a Z direction has a rectangular shape,

in a plan view of the magnetic core from the Z direction, the first recessed portion is located in a central portion of the first end core with respect to a Y direction, in a plan view of the magnetic core from the Z direction, a width of the first recessed portion in the Y direction, which is defined as a width of an opening of the first recessed portion between two inner wall faces facing each other in the Y direction, is 5% or more and 50% or less of a length of the first end core in the Y direction, and a depth of the first recessed portion in the X direction, which is defined as a distance from the opening of the first recessed portion to a bottom face thereof, is 50% or more and 66% or less of a length of the first end core in the X direction,

the X direction is a direction conforming to an axial direction of the middle core,

the Y direction is a direction in which the middle core, the first side core, and the second side core are side-by-side, and

the Z direction is a direction orthogonal to the X direction and the Y direction.

6 . The reactor according to claim 1 ,

wherein the second end core includes:

a second outer face separated from the second end face in the X direction, and

a second recessed portion provided in the second outer face, and

in a plan view of the magnetic core from the Z direction, the second recessed portion is provided in a central portion of the second end core with respect to the Y direction.

7 . The reactor according to claim 1 ,

wherein the coil further includes a second winding portion and a third winding portion,

the first side core is arranged inside the second winding portion, and

the second side core is arranged inside the third winding portion.

8 . A converter comprising the reactor according to claim 1 .

9 . A power conversion device comprising the converter according to claim 8 .

10 . The reactor according to claim 4 ,

wherein another of the core pieces is a second core piece that includes at least the second end core, and

a gap portion is formed between the first core piece and the second core piece inside the first winding portion.

11 . The reactor according to claim 1 ,

wherein the first end core and the second end core have a larger width in the Y direction than the first winding portion.

12 . The reactor according to claim 1 ,

wherein the first end core and the second end core have a substantially rectangular parallelepiped shape.