Title:
METHOD OF MANUFACTURING MAGNET MATERIAL, METHOD OF MANUFACTURING ROTOR OF ELECTRIC MOTOR, METHOD OF MANUFACTURING ELECTRIC MOTOR, AND MAGNET MATERIAL
Document Type and Number:
Japanese Patent JP2023150892
Kind Code:
A
Abstract:
To provide a method for promoting reuse of a magnet used in an electric motor.SOLUTION: A method of manufacturing a magnet material includes a demagnetization step of irreversibly demagnetizing a permanent magnet by thermal demagnetization by heating a shaped permanent magnet in the presence of a reducing substance having a stronger reducing property than nitrogen molecules, and a cooling step of cooling the demagnetized permanent magnet to manufacture a shaped magnet material. The magnetic material having a thickness of 30 μm or more contains a rare earth element and a transition metal element as main components. In the magnetic material, a ratio of carbon concentration in the surface region, which is a region within 10 μm from the surface of the magnet material, to the carbon concentration in an inner region, which is a region located above 10 μm from the surface of the magnet material and has a thickness of 10 μm is 1.1 or higher.SELECTED DRAWING: Figure 3
Inventors:
ITOYAMA RYOSUKE
TAKEI YASUJI
TAKEI YASUJI
Application Number:
JP2022060229A
Publication Date:
October 16, 2023
Filing Date:
March 31, 2022
Export Citation:
Assignee:
HONDA MOTOR CO LTD
International Classes:
H01F41/02; H01F7/02; H01F13/00; H02K15/03
Attorney, Agent or Firm:
Patent Attorney Corporation RYUKA International Patent Office