Abstract: A motor structure for driving discs includes a motor having a frame wall and a hollow holding cylinder extending generally perpendicular from the frame wall, a rotor shaft coaxially disposed in the hollow holding cylinder, and bearings mounted on the hollow holding cylinder for rotatably supporting the rotor shaft. The holding cylinder has an outer part, and a coil is mounted on the outer part. A cup-shaped rotor is mounted on the rotor shaft, the cup-shaped rotor having an end wall, a first cylinder portion extending coaxially from the end wall, and a second cylindrical portion juxtaposed to the first cylindrical portion. The first cylindrical portion has a diameter which is less than the diameter of the second cylindrical portion, the coil being generally axially aligned with and being disposed radially inwardly of the second cylindrical portion.

Abstract: Motor structure having a shaft supported on a frame rotatably by bearings, a core arranged outside of the shaft, a cup-shaped rotor arranged outside of the core, and a magnet fitted to the rotor, the rotor having a rotor body integrally incorporated with the above-mentioned shaft, and the rotor body having an opened end part from which a magnet mounting section is bulged out, whereby the above-mentioned magnet is fitted to the magnet mounting section, facing the shaft.