| 简介 |
PROBLEM TO BE SOLVED : To provide a manufacturing method of an iron yoke integrally fitted outer rotor magnet which has reliability such as high dimensional accuracy at an actual use temperature of an outer rotor or high weather resistance in an outer rotor magnet in which an annular iron yoke and an annular rare earth-iron based bond magnet are integrally fitted.
SOLUTION : The manufacturing method includes : a first step of manufacturing an annular green compact containing a rare earth-iron based magnet foil, a thermosetting resin composition which is a solid at the normal temperature, and a residual cavity through compression molding; and a second step of inserting the annular green compact inside of an annular iron yoke, heating the green compact to expand an outer diameter of the annular green compact through thermal expansion of the thermosetting resin composition constituting the annular green compact, bringing an outer circumferential surface of the annular green compact and an inner circumferential surface of the annular iron yoke into a restricted state at a predetermined position before initiating a two-dimensional crosslinking reaction of the thermosetting resin composition, and thermally hardening the thermosetting resin composition constituting the annular green compact in the restricted state into an annular bond magnet.
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