US 12,394,564 B2
Method of manufacturing polar anisotropic magnet, method of manufacturing magnet assembly, polar anisotropic magnet, magnet assembly, and composite magnet assembly
Kesatoshi Takeuchi, Nagano (JP); Tadashi Sasaki, Nagano (JP); Hideaki Takayanagi, Nagano (JP); and Takahiro Mibu, Nagano (JP)
Assigned to MIYAWAKI KOBO CO., LTD., Nagano (JP)
Appl. No. 18/001,592
Filed by MIYAWAKI KOBO CO., LTD., Nagano (JP)
PCT Filed Dec. 22, 2021, PCT No. PCT/JP2021/047696
§ 371(c)(1), (2) Date Dec. 13, 2022,
PCT Pub. No. WO2022/138765, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-217973 (JP), filed on Dec. 25, 2020; and application No. 2020-217974 (JP), filed on Dec. 25, 2020.
Prior Publication US 2023/0223191 A1, Jul. 13, 2023
Int. Cl. H01F 41/02 (2006.01); H01F 7/02 (2006.01); H01F 13/00 (2006.01); H02K 15/03 (2025.01)
CPC H01F 41/028 (2013.01) [H01F 7/021 (2013.01); H01F 13/003 (2013.01); H02K 15/03 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A method of manufacturing a polar anisotropic magnet having four surfaces that respectively face four directions as viewed in cross section: the method of manufacturing a polar anisotropic magnet comprising, in a following order:
a powder material preparation step in which a powder material for a magnet is prepared;
an in-field molding step in which the powder material is sequentially charged into the mold in a state where, assuming a surface on which a magnetic flux is to be generated in a concentrated manner out of the four surfaces as an effective surface, a magnetic field of a first direction is applied to an assumed effective surface expected to become the effective surface and a magnetic field of a second direction is applied to the remaining three surfaces from an outside of the mold that corresponds to a target shape of the polar anisotropic magnet thus molding a magnet base material having a shape that traces the mold; and
a four-way magnetization step in which a magnet material obtained based on the magnet base material is magnetized by applying the magnetic field of the first direction to the effective surface of the magnet material and by applying the magnetic field of the second direction to the remaining three surfaces in a state where the magnetic field of the first direction and the magnetic field of the second direction surround the magnet material.