A downsized spindle motor having a longer bearing service life and enhanced shock resistance includes a flange 11, which bears an axial load of a shaft 8, and which is fixed to an end of shaft 8. The selected acoustic units are chosen to minimize a combination of target and concatenation costs for a given sentence. Static andor dynamic configuration of the system may be used. Moving parts include a self scavenging gear box utilizing the centrifugal pumping action of its gears to return oil to the scoop pump, and self scavenging bearing chambers using centrifugal effects of their rotating parts also to return oil to the scoop pump. Winding core ends placed against each other are coupled to be on the same axis of rotation during winding by severing cuts which are formed in the ends of the winding cores and which deviate from a perpendicular cutting line. Directly at the end face, distances between peripheral angles of successive main flutes in the direction of rotation are smaller between uneven-numbered main flutes and subsequent even-numbered main flutes than the distances between peripheral angles between even-numbered main flutes and subsequent uneven-numbered main flutes.