| 摘要 |
PROBLEM TO BE SOLVED: To firmly fit a cylindrical magnet integrally with a cylindrical yoke and inhibit degradation in the magnetic properties of the cylindrical magnet. SOLUTION: The cylindrical yoke 12, of which the internal diameter is smaller than the external diameter of the cylindrical magnet 14 at an ordinary temperature is placed on a heating table and heated to a prescribed temperature for thermal expansion, until the cylindrical magnet 14 can be fit into the cylindrical yoke 12. The cylindrical magnet 14 is fit into the cylindrical yoke 12. When the cylindrical yoke is cooled to the ordinary temperature under this condition, the yoke 12 shrinks, so that the internal periphery may be crimped onto the outer periphery of the cylindrical magnet 14, and the yoke 12 and the magnet 14 are fitted and fixed to each other. Because the coefficient of thermal expansion of the cylindrical yoke 12 is high, the jointing strength of the yoke 12 to the magnet 14 becomes high, so that the yoke 12 can be fit integrally firmly with the magnet 14.
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