Magnetic field analyzing method and device therefor

Details Magnetic field analyzing method and device therefor Magnetic field analyzing method and device therefor

2005-11-22

2005-11-22

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

C335S302000, C335S306000, C361S148000

Reexamination Certificate

active

06967551

ABSTRACT:
A method and apparatus for magnetic field analysis, contributing to not only determining whether or not demagnetization would occur in a permanent magnet but also calculating its magnetic flux density distribution after the demagnetization, is provided. In a magnetic field analysis method according to the present invention, first, permeance coefficients at multiple sites in a permanent magnet and/or numerical values that are dependent on the permeance coefficients are calculated based on B-H curve data of the permanent magnet at a first temperature T1. Next, modified B-H curve data of the permanent magnet, which has been operated at a second temperature T2 that is different from the first temperature T1, are derived for the respective sites based on B-H curve data of the permanent magnet at the second temperature T2 and the permeance coefficients or the numerical values.

REFERENCES:
patent: 5041172 (1991-08-01), Tokunaga et al.
patent: 09-051700 (1997-02-01), None
patent: 2002-328956 (2002-11-01), None
patent: 2002-328957 (2002-11-01), None
patent: 2003-242199 (2003-08-01), None
Yasuto Taniguchi et al., “Magnetic Field Analysis of a Permanet Magnet Motor with a Skewed Rotor Using the Finite Element Method and a 3-D Mesh Coupling Method”, URL: http://www.jri.co.jp/pro-eng/jmag/analysis/paper/skew.pdf.

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