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US 2017/0287632 A1Published application
Radially anisotropic sintered ring magnet and its production method
AssigneeHitachi Metals, Ltd.
InventorTakahiro KATOU
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AssigneeHitachi Metals, Ltd.
InventorTakahiro KATOU
Estimating the term…
A method for producing a radially anisotropic sintered ring magnet by continuously repeating a step of supplying magnetic powder to a die comprising a columnar magnetic core, and a cylindrical outer die having axially connected magnetic member and non-magnetic member, with a cavity between the core and the cylindrical outer die, and a step of compression-molding the magnetic powder in a radial magnetic field applied between the magnetic core and the magnetic member of the outer die, plural times in one die, to form a final green body composed of pluralities of integrally connected green bodies; and sintering the final green body; the magnetic field being applied in a state where an upper end of the magnetic member of the cylindrical outer die is higher than an upper surface of the magnetic powder supplied.
A method for producing a radially anisotropic sintered ring magnet comprising
A radially anisotropic sintered ring magnet having a connection in a plane perpendicular to the axial direction, with no decrease in a surface magnetic flux density at said connection.
A radially anisotropic sintered ring magnet having a connection in a plane perpendicular to the axial direction, a surface magnetic flux density (mT) at said connection being larger than a value obtained by subtracting 25 (mT) from an average of magnetic flux densities (mT) at positions of +5 mm and −5 mm, respectively, axially separate from the connection.
Dependencies are inferred from the claim text.