Reactor, converter, and power conversion device
A reactor includes a coil and a magnetic core. The coil includes one winding portion. The magnetic core includes a middle core part, two side core parts and two end core parts. The middle core part has a part to be arranged inside the winding portion. Each of the two side core parts is arranged side by side with the middle core part outside the winding portion. Each of the two end core parts is arranged to connect the middle core part and the two side core parts outside end parts of the winding portions. The magnetic core has a first region and a second region having a higher relative magnetic permeability than the first region. The first region includes two corner parts constituted by the middle core part and each of the two end core parts. The second region includes a base end region and a projecting region.
1 . A reactor, comprising:
a coil: and
a magnetic core,
the coil including one winding portion,
the magnetic core including a middle core part, two side core parts and two end core parts,
the middle core part having a part to be arranged inside the winding portion,
each of the two side core parts being arranged side by side with the middle core part outside the winding portion,
each of the two end core parts being arranged to connect the middle core part and the two side core parts outside end parts of the winding portions,
the magnetic core having a first region and a second region having a higher relative magnetic permeability than the first region,
the first region including two corner parts constituted by the middle core part and each of the two end core parts,
the second region including a base end region and a projecting region,
the base end region extending in a parallel direction of the middle core part and the two side core parts across an axis of the middle core part in each of the two end core parts, and
the projecting region projecting toward the middle core part from the base end region.
2 . The reactor of claim 1 , wherein the projecting region has a tip part reaching the end part of the winding portion on a proximate side.
3 . The reactor of claim 1 , wherein a central region in an axial direction of the middle core part is constituted by the first region.
4 . The reactor of claim 1 , wherein a region of each of the two end core parts facing the winding portion is constituted by the first region.
5 . The reactor of claim 1 , wherein each of the two side core parts is constituted by the first region.
6 . The reactor of claim 1 , wherein the relative magnetic permeability in the first region is 5 or more and 50 or less.
7 . The reactor of claim 1 , wherein the relative magnetic permeability in the second region is 50 or more and 500 or less.
8 . The reactor of claim 1 , wherein the first region is constituted by a compact of a composite material, a soft magnetic powder being dispersed in a resin in the composite material.
9 . The reactor of claim 1 , wherein the second region is constituted by a powder compact made of a soft magnetic powder.
10 . The reactor of claim 1 , wherein:
the magnetic core is composed of two core pieces having the same shape, and
each of the two core pieces is an E-shaped member including one of the two end core parts, a part of the middle core part and a part of each of the two side core parts.
11 . The reactor of claim 1 , comprising a molded resin portion for at least partially covering the magnetic core.
12 . A converter, comprising the reactor of claim 1 .
13 . A power conversion device, comprising the converter of claim 12 .