Composite material, reactor, converter, and power conversion device
There is provided a composite material containing magnetic powder and a polymeric material including the powder in a dispersion state, wherein a content of the magnetic powder with respect to the whole composite material is more than 50% by volume and 75% by volume or less, a saturation magnetic flux density of the composite material is 0.6 T or more, and a relative magnetic permeability of the composite material is more than 20 and is 35 or less. It is preferable that a density ratio of the magnetic powder should be 0.38 or more and 0.65 or less. The density ratio is set to be an apparent density/a true density. Moreover, it is preferable that the magnetic powder should include a plurality of particles constituted of the same material.
1. A composite material comprising magnetic powder and a polymeric material including the powder in a dispersion state, wherein
the magnetic powder consists of a plurality of particles constituted of the same material as pure iron powder,
a plurality of peaks is present when a particle size distribution of the magnetic powder is taken, the plurality of peaks having first and second peaks in the particle size distribution represented by particle diameters r 1 and r 2 , respectively, and satisfying r 1 ≤(½)×r 2 ,
the particle diameter r 1 is 50 micrometers or more and 100 micrometers or less, and the particle diameter r 2 is 100 micrometers or more and 150 micrometers or less,
a content of the magnetic powder with respect to the whole composite material is more than 50% by volume and 75% by volume or less,
a saturation magnetic flux density of the composite material is 0.6 T or more, and
a relative magnetic permeability of the composite material is more than 20 and 35 or less.
2. The composite material according to claim 1 , wherein
a density ratio of the magnetic powder is 0.38 or more and 0.65 or less, and
the density ratio is set to be an apparent density/a true density.
3. The composite material according to claim 1 , wherein an apparent density of the magnetic powder is 3.0 g/cm 3 or more and 5.0 g/cm 3 or less.
4. The composite material according to claim 1 , wherein a degree of circularity of the particle constituting the magnetic powder is 1.0 or more and 2.0 or less.
5. A reactor comprising a coil and a magnetic core, wherein
at least a part of the magnetic core is constituted of the composite material according to claim 1 .
6. A reactor comprising a coil and a magnetic core, wherein
the whole magnetic core is constituted of the composite material according to claim 1 .
7. A converter comprising the reactor according to claim 5 .
8. A power conversion device comprising the converter according to claim 7 .
9. A converter comprising the reactor according to claim 6 .
10. A power conversion device comprising the converter according to claim 9 .