Patent ID: 6713912
Filing Date: 2004-03-30
Classification: G11B,H02K

Abstract:
A spindle motor for a disk driving device, comprising:a housing having a cylindrical projection portion formed therewith as a one-piece member; a stator comprising a stack and coils wound around the stack, the stator mounted on an outer circumference of the cylindrical projection portion of the housing to confront a magnet; a lead wire of the coils connected to an electric supplying connector portion; a rotor having a central hole and a downwardly depending flange at an outer periphery thereof, the rotor supported rotatably relative to the housing by a bearing means, the magnet disposed on an inner peripheral surface of the downwardly depending flange of the rotor, and a shaft fitted in the central hole of the rotor, wherein the bearing means is a pair of ball bearings, the ball bearings are disposed in the cylindrical projection portion of the housing with a spacer disposed between the bearings and the housing and the rotor are made of a super engineering plastic material and are unitarily formed by injection molding.