Magnetic mixture

• US 6,432,159 B1
• Filed: 09/28/2000
• Issued: 08/13/2002
• Est. Priority Date: 10/04/1999
• Status: Expired due to Fees

• Current Assignee: Daido Tokushuko Kabushiki Kaisha
• Original Assignee: Daido Tokushuko Kabushiki Kaisha
• Inventors: Koyama, Haruo, Yahagi, Shinichiro, Yashiro, Toshiaki, Saito, Takanobu, Takemoto, Satoshi
• Primary Examiner(s): MAI, NGOCLAN THI
• Application Number:
  US09/671,692
• Time in Patent Office: 684 Days
• Field of Search: 752/55, 752/52, 148/300, 148/100, 252/62.51 R
• US Class Current: 75/255
• CPC Class Codes: H01F 1/20 in the form of particles, e.g. powder H01F1/147 takes precedence
• CPC Class Codes: H01F 1/24 the particles being insulated

Abstract

A magnetic mixture comprising at least two kinds of powders which are uniformly mixed with each other. Each powder exhibits a significant magnetic property when its constituent elements have a predetermined composition ratio. Magnetic properties of each powder are retained in the magnetic mixture which exhibits, as a whole, a soft magnetic property. The magnetic mixture is useful as a raw material for a powder magnetic core.

Claims

1. A magnetic mixture comprising:

at least two kinds of powders which are uniformly mixed with each other, constituent elements of each of said powders having a particular composition ratio to exhibit a significant point in magnetic property, magnetic properties of each of said powders being retained in said magnetic mixture, and said magnetic mixture exhibiting, as a whole, a soft magnetic property.

3. The magnetic mixture according to claim 1, further comprising:

at least one kind of insulating material which is uniformly mixed thereinto.

4. The magnetic mixture according to claim 1, wherein said significant point is a point at which magnetostriction is substantially zero or a magnetic anisotropy constant is substantially zero.

5. The magnetic mixture according to claim 1, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

10. The magnetic mixture according to claim 3, wherein said significant point is a point at which magnetostriction is substantially zero or a magnetic anisotropy constant is substantially zero.

12. The magnetic mixture according to claim 3, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

13. The magnetic mixture according to claim 4, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

16. The magnetic mixture according to claim 10, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

2. A magnetic mixture comprising:

at least one kind of soft magnetic material powder whose constituent elements having a particular composition ratio to exhibit a significant point in magnetic property; and

at least one different kind of soft magnetic material powder which is uniformly mixed with said at least one kind of soft magnetic material powder,

wherein magnetic properties of each of said powders are retained in said magnetic mixture, and said magnetic mixture exhibits, as a whole, a soft magnetic property.

8. The magnetic mixture according to claim 2, further comprising:

at least one kind of insulating material which is uniformly mixed thereinto.

9. The magnetic mixture according to claim 2, wherein said significant point is a point at which magnetostriction is substantially zero or a magnetic anisotropy constant is substantially zero.

11. The magnetic mixture according to claim 2, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

14. The magnetic mixture according to claim 8, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

15. The magnetic mixture according to claim 9, wherein said significant point is a point at which permeability has a local maximum, a coercive force has a local minimum, or saturation magnetization has a local maximum.

6. A magnetic mixture comprising:

two or three kinds of powders which are uniformly mixed with each other, said powders being selected from the group consisting of a powder of an Fe-(3.0±

0.5)% Si alloy, a powder of an Fe-(6.5±

0.5)% Si alloy, and a powder of an Fe-(9.5±

0.5)% Si-(5.5±

0.5)% Al alloy.

7. A magnetic mixture comprising:

the magnetic mixture as set forth in claim 6 of 70% or more by weight; and

a powder of pure iron of 30% or less by weight.