POWDER CORE, POWDER CORE MANUFACTURING METHOD, AND METHOD FOR ESTIMATING EDDY CURRENT LOSS IN POWDER CORE

Title:

POWDER CORE, POWDER CORE MANUFACTURING METHOD, AND METHOD FOR ESTIMATING EDDY CURRENT LOSS IN POWDER CORE

Document Type and Number:

WIPO Patent Application WO/2013/175929

Kind Code:

A1

Abstract:

The purpose of the invention is to set the single grain size equivalent diameter ds of soft magnetic metal powder, expressed by the following equation, to 210 μm or lower to make the eddy current loss less than 150 W/kg at a frequency of 3,000 Hz, where ds indicates single particle size equivalent diameter [m] of the soft magnetic metal powder, dMN indicates the number average particle size [m] of the soft magnetic metal powder, and σ indicates the standard deviation [m] of the particle sizes of the soft magnetic metal powder.

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Inventors:

KATAYANAGI HIKARU (JP)
MUNEDA NORIKAZU (JP)
SHIMAZU EIICHIROU (JP)

Application Number:

PCT/JP2013/062200

Publication Date:

November 28, 2013

Filing Date:

April 25, 2013

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
KATAYANAGI HIKARU (JP)
MUNEDA NORIKAZU (JP)
SHIMAZU EIICHIROU (JP)

International Classes:

H01F1/24; B22F1/05; B22F1/16; B22F3/00; H01F41/00; H01F41/02

Domestic Patent References:

WO2009034710A1	2009-03-19
WO2009075173A1	2009-06-18

Foreign References:

JP2010196101A	2010-09-09
JP2009070885A	2009-04-02
JP4436172B2	2010-03-24

Other References: