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Title:
DEMAGNETIZATION APPARATUS, AND DEMAGNETIZATION METHOD
Document Type and Number:
Japanese Patent JP2008263079
Kind Code:
A
Abstract:

To effectively perform demagnetization of a rare earth magnet, an NdFeB-based bond magnet or the like having high coercive force by comparatively simple constitution.

A demagnetization apparatus comprises: first and second switches 11a, 11b for charging a charging capacitor 6 in a positive direction by voltage from a boost transformer 3; third and fourth switches 11c, 11d for charging the charging capacitor 6 in a negative direction; a fifth switch 13 for allowing a positive current from the charging capacitor 6 to flow into a demagnetization coil 8; a sixth switch 14 for allowing a negative current from the charging capacitor 6 to flow into the demagnetization coil 8; a voltage detection means 12 for detecting voltage between both the ends of the charging capacitor 6; and a control means 10 for controlling the first to sixth switches 11a to 14 according to the detection voltage of the voltage detection means 12.


Inventors:
KASAHARA ARIHITO
HORI MITSUTAKA
Application Number:
JP2007105053A
Publication Date:
October 30, 2008
Filing Date:
April 12, 2007
Export Citation:
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Assignee:
NIPPON DENJI SOKKI KK
International Classes:
H01F13/00
Domestic Patent References:
JPH073108U1995-01-17
JPS59147270A1984-08-23
JPS56134146A1981-10-20
JP2003303716A2003-10-24
JPH0582343A1993-04-02
JPH073108U1995-01-17
JPS59147270A1984-08-23
Attorney, Agent or Firm:
Yoshitsuno Kakuda
Hitoshi Ito