| 摘要 |
PURPOSE:To prevent a collision sound between a shaft and a bearing for rotatably holding a rotor by forming an independent bearing separately from the bearing, and energizing the independent bearing in a direction perpendicular to the axial direction. CONSTITUTION:The shaft 11 of a rotor 10 is movably engaged with bearings, 15, 16 secured to a frame 20, ferrite permanent magnets 24, 24' are secured to the inner wall of the frame 20 to construct a small-sized motor. A core 12 on which copper wires 13 are wound and commutator 14 are press-fitted fixedly to the shaft 11. In this case, an independent bearing 17 is provided separately from the bearings 15, 16 on the shaft 11, and energized by a spring 28 in a direction of an arrow A in the drawing. Thus, the shaft 11 is not vibrated laterally in a clearance, but contacted with the left walls of the shafts 15, 16 to rotate steadily. |
