Title:
DEMAGNETIZATION METHOD AND DEMAGNETIZER
Document Type and Number:
Japanese Patent JP2015035558
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a demagnetization method and a demagnetizer thereof which allow for shortening of the processing time while reducing the highest required demagnetization field and demagnetization field strength, while allowing demagnetization of an internal rare earth magnet, without decomposing a rare earth magnet built-in apparatus.SOLUTION: A magnet to be demagnetized is arranged in a demagnetization coil so that a demagnetization field is applied in the right angle direction for the orientation direction of the magnet. Subsequently, a first attenuation vibration current is fed from a capacitor charged to a predetermined voltage to the demagnetization coil, and a first attenuation vibration magnetic field M1 is applied. Thereafter, the capacitor is recharged up to the predetermined voltage, and a second attenuation vibration current are fed from the capacitor thus recharged, so that the current is opposite to the first attenuation vibration current at start, and the peak magnetic field is substantially same as that of the first attenuation vibration magnetic field, before applying a second attenuation vibration magnetic field M2.
Inventors:
MIURA KOZO
ENDO SEIJI
ENDO SEIJI
Application Number:
JP2013166941A
Publication Date:
February 19, 2015
Filing Date:
August 09, 2013
Export Citation:
Assignee:
MAGNET FORCE CO LTD
International Classes:
H01F13/00
Attorney, Agent or Firm:
Ryuichi Yata
Sugimoto Strong
Sugimoto Strong
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