| 摘要 |
PURPOSE: A rotor of motor is provided to lower a crack generation in a frame substrate and improve an exactness in size of a shaft supporting part. CONSTITUTION: The rotor comprises: a frame(29) of resin including a yoke establishing part(30) having a cylindrical shape and a substrate part(31) enclosing a part of the yoke establishing part; a shaft supporting part established in the substrate part, for supporting a rotational shaft; a rotor yoke(35) established in the yoke establishing part, nearly divided into a plural unit yoke(36), and having a cylindrical shape; and a rotor magnet established in the yoke establishing part. Thus, the divided plural unit yokes allow the expansion or retraction of the rotor yoke to be dispersed in the outward direction during the molding of the frame and it becomes difficult that a stress affects the substrate part in the inward direction. As a result, it is prevented that cracks due to a residual stress are generated at the substrate part. |
