Title:
DUST CORE AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP3656958
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an inexpensive dust core that is excellent in electric characteristics and magnetic characteristics.
SOLUTION: This dust core is manufactured by press-molding iron-based magnetic powder having an oxide coating film on its surface. The saturation magnetization Ms and specific resistance ρ of the dust core in a magnetic field of 1.6 MA/m are respectively adjusted to Ms≥1.9 T and ρ≥0.7 μΩm and the magnetic flux density B2k of the core in a magnetic field of 2 kA/m is adjusted to B2k≥0.9 T. In addition, the magnetic flux density B10k and four-point bending strength σ of the core in a magnetic field of 10 kA/m are respectively adjusted to B10k≥1.6 T and σ≥50 MPa. Since the oxide coating film is formed on the surface of the magnetic powder, the electric characteristics and magnetic characteristics of the dust core are improved and the manufacturing cost of the core is reduced.
Inventors:
Mikio Kondo
Shin Tajima
Takeshi Hattori
Hiroshi Okajima
Shin Tajima
Takeshi Hattori
Hiroshi Okajima
Application Number:
JP2001132238A
Publication Date:
June 08, 2005
Filing Date:
April 27, 2001
Export Citation:
Assignee:
Toyota Central R & D Labs.
TOYOTA JIDOSHA KABUSHIKI KAISHA
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
B22F1/00; B22F3/02; H01F1/24; H01F27/255; H01F41/02; (IPC1-7): H01F41/02; B22F1/00; B22F3/02; H01F1/24; H01F27/255
Domestic Patent References:
| JP9272901A | ||||
| JP51043007B1 | ||||
| JP10130773A | ||||
| JP2000199002A | ||||
| JP5345897A | ||||
| JP11238614A | ||||
| JP4352403A | ||||
| JP7135106A |
Foreign References:
| WO1999030901A1 | ||||
| WO2002058085A1 |
Attorney, Agent or Firm:
Hiroshi Okawa