Magnetic core and method of manufacturing core
AssigneeKabushiki Kaisha Toshiba
InventorsMasami Okamura, Takao Sawa, Yoshiyuki Yamauchi, Takao Kusada
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Abstract
A magnetic core comprises a ferroalloy amorphous film and an insulator layer. The preferable ferroalloy amorphous film is defined as follows: (Fe.sub.1-x T.sub.x).sub.100-y X.sub.y wherein: T is at least one element selected from Co and Ni; X is at least one element selected from Si, B, P, C and Ge; and 0<x.ltoreq.0.4 14.ltoreq.y.ltoreq.21 The preferable insulator layer is made of a high polymer film, for example a polyester film. Also, the magnetic core has the magnetic characteristics of the direct current coercive force is 0.2 Oe or less, and total value of residual magnetic flux density and saturated magnetic flux density is 27 KG or more.
Claims32
A magnetic core comprising,
- a wound ferroalloy amorphous film defined by
- (Fe.sub.1-x T.sub.x).sub.100-y X.sub.y
- wherein
- T is at least one element selected from Co and Ni
- X is at least one element selected from Si, B, P, C and Ge
- 0<x.ltoreq.0.4
- 14.ltoreq.y.ltoreq.21;
- and
- a polymer insulating film wound with the ferroalloy amorphous film;
- wherein the value of the direct current coercive force of the magnetic core is 0.2 Oe or less, and the total value of residual magnetic flux density and saturated magnetic flux density is 27 KG or more.
A magnetic core comprising,
- a wound ferroalloy amorphous film defined by
- (Fe.sub.1-x-p T.sub.x Z.sub.p).sub.100-y X.sub.y
- wherein
- T is at least one element selected from Co and Ni
- X is at least one element selected from Si, B, P, C and Ge
- Z is at least one element selected from Ti, Ta, V, Cr, Mn, Cu, Mo, Nb and W
- 0<x.ltoreq.0.4
- 14.ltoreq.y.ltoreq.21;
- 0<p.ltoreq.5;
- and
- a polymer insulating film wound with the ferroalloy amorphous film;
- wherein the value of the direct current coercive force of the magnetic core is 0.2Oe or less, and the total value of residual magnetic flux density and saturated magnetic flux density is 27 KG or more.
The method of manufacturing a magnetic core comprising the steps of:
- winding a ferroalloy amorphous film including at least one of Co and Ni to form a ferroalloy amorphous film core having a first space factor defined by the ratio of ferroalloy amorphous film volume to ferroalloy amorphous film core volume,
- heat treating the ferroalloy amorphous film core at temperatures of 360.degree. C. or less while maintaining said first space factor and subjecting the ferroalloy amorphous film core to a magnetic field of 10 Oe or more in parallel to the magnetic path of the magnetic core, and
- rewinding the ferroalloy amorphous film core with an insulating layer to form the magnetic core with a second space factor defined by the ratio of ferroalloy amorphous film volume to the volume of the magnetic core,
- said first space factor being in a range of 80% to 120% of the second space factor.
A magnetic core product formed by the method of claim wherein the ferroalloy amorphous film is defined by
- (Fe.sub.1-x-p T.sub.x Z.sub.p).sub.100-y X.sub.y
- wherein
- T is at least one element selected from Co and Ni
- X is at least one element selected from Si, B, P, C and Ge
- Z is at least one element selected from Ti, Ta, V, Cr, Mn, Cu, Mo, Nb and W
- 0<x.ltoreq.0.4
- 14.ltoreq.y.ltoreq.21;
- 0<p.ltoreq.5;
- and
- an insulating layer wound with the ferroalloy amorphous film;
- wherein the value of the direct current coercive force of the magnetic core is 0.2 Oe or less, and the total value of residual magnetic flux density and saturated magnetic flux density is 27 KG or more.
Dependencies are inferred from the claim text.