| 摘要 |
A method of the present invention for manufacturing a small-sized motor relates to cutting or grinding of a shaft end portion of a rotor into a noncircular shape over a predetermined length for establishing a mechanical coupling with a device to be driven. The cutting or grinding work is performed after a laminated core 7, a winding 6, a commutator 5, and a thrust bush 8 are assembled on a shaft 11 to thereby assemble the rotor. Alternatively, a process of cutting or grinding the shaft end portion into a noncircular shape is performed after a casing 1, an end bell 4 to be fitted to an opening portion of the casing 1, and a rotor are assembled into a small-sized motor. Thus, the present invention provides a method for manufacturing a small-sized motor in which a shaft has a D cut formed thereon, enables determination of whether or not the D cut is to be formed on the shaft, at a later stage of a motor assembly process, to thereby eliminating the need to control the stock of shafts bearing the D cut, does not involve the need to orient shafts in the same direction in preparation for press-fitting of laminated cores of rotors to the corresponding shafts, and can prevent generation of scrapings when a thrust bush is press-fitted to a shaft.
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