Magnetic loss material and method of producing the same
First Claim
1. A magnetic loss material comprising a soft magnetic powder and a binder binding the particles of the powder to one another, the magnetic loss material having a frequency dispersion profile of an imaginary part magnetic permeability (μ
- ″
), wherein the frequency dispersion profile comprises at least two different dispersion portions including a first dispersion portion (D1) at a relatively high-frequency side and a second dispersion portion (D2) at a relatively low frequency side, the imaginary part magnetic permeability (μ
″
) having a first maximum value (μ
″
max (D1)) that is the maximum within the first dispersion portion (D1) and a second maximum value (μ
″
max (D2)) that is the maximum within the second dispersion portion (D2), the second maximum value μ
″
max (D2) being equal to or greater than the first maximum value (μ
″
max (D1)).
1 Assignment
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Accused Products
Abstract
A magnetic loss material includes a soft magnetic powder and a binder. In the magnetic loss material, a frequency dispersion profile of an imaginary part magnetic permeability (μ″) has at least two different dispersion portions including a first dispersion portion (D1) at a relatively high-frequency side and a second dispersion portion (D2) at a relatively low frequency side. The imaginary part magnetic permeability has first and second maximum values (μ″max (D1) and μ″max (D2)) as the maxima within the first and the second dispersion portions, respectively. The second maximum value is equal to or greater than the first maximum value. The second dispersion portion may be the dispersion owing to magnetic resonance. The first dispersion portion may be the dispersion owing to eddy current.
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Citations
16 Claims
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1. A magnetic loss material comprising a soft magnetic powder and a binder binding the particles of the powder to one another, the magnetic loss material having a frequency dispersion profile of an imaginary part magnetic permeability (μ
- ″
), wherein the frequency dispersion profile comprises at least two different dispersion portions including a first dispersion portion (D1) at a relatively high-frequency side and a second dispersion portion (D2) at a relatively low frequency side, the imaginary part magnetic permeability (μ
″
) having a first maximum value (μ
″
max (D1)) that is the maximum within the first dispersion portion (D1) and a second maximum value (μ
″
max (D2)) that is the maximum within the second dispersion portion (D2), the second maximum value μ
″
max (D2) being equal to or greater than the first maximum value (μ
″
max (D1)). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of producing a magnetic loss material in which a frequency dispersion profile of an imaginary part magnetic permeability (μ
- ″
) has first and second dispersion portions (D1 and D2) having mutually different dispersion frequency regions, the second dispersion portion (D2) at a low-frequency side being a dispersion owing to magnetic resonance, said method comprising;
preparing soft magnetic powder of an indefinite shape having a thickness or a diameter which is greater than a skin depth;
grinding said soft magnetic powder to obtain magnetic hybrid soft magnetic powder comprising a first particle group and a second particle group each of which contains powder particles of an indefinite shape or a flat shape, the powder particles in the first particle group having a thickness or a diameter which is greater than said skin depth, the powder particles in the second particle group having a thickness or a diameter which is smaller than said skin depth;
mixing a binder including a high molecular compound into said hybrid soft magnetic powder to obtain a mixture thereof; and
molding said mixture.
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Specification