Sensor magnet holder, motor incorporating the holder, and manufacturing method thereof

摘要

A sensor magnet holder is formed such that a cylindrical portion, a flange portion formed by increasing the diameter of one end part of the cylindrical portion, a magnet rear-end engagement portion formed at the other end part of the cylindrical portion, and four plate-like snap fit tongues are formed integral with one another. The cylindrical portion including the flange portion has, on its inner diametral side, a press fit portion to be press-fitted to a motor shaft. The four plate-like snap fit tongues have respective magnet front-end engagement portions formed on an outer diametral side of their tip portions. The four snap fit tongues are brought into contact with respective flat inner surfaces of the sensor magnet having four flat inner surfaces, by utilizing elasticity of the snap fit tongues. The sensor magnet is retained between the magnet rear-end engagement portion and the magnet front-end engagement portions.