Imported: 23 Feb '17 | Published: 22 Oct '02
USPTO - Utility Patents
In an outer rotor type spindle motor for driving a disc with a relatively long axial dimension for mounting a large number of the discs, it is possible to reduce part cost and assembling work cost while increasing a rotational precision. The stator is disposed on an opening surface of a drum portion of the rotor rather than between a pair of bearings within the drum portion. The stator coil end may be led to the outside of the drum portion without passing through the bearing to dispense with the conventional works such as a processing of a shaft, an insertion of a lead wire through a tubular hole and the like. Also, a bush between the drum portion and the bearing, which conventionally causes the degradation of the rotational precision and the increases in the cost for the parts and the assembling work, is dispensed with. In order to elongate the distance between the bearings and reduce the axial direction of the stator, a magnet material having a magnetic energy product that is higher than that generally used to this type of motor is selected.
In the accompanying drawings:
1. An outer rotor disc driving spindle motor in which a rotor having a magnet facing a stator comprising a coil and fixedly supported on a shaft, is located outside of said stator, mounted to a shaft via a first and a second bearings provided with a spacer means inbetween, characterized in that;
2. The disc driving spindle motor according to
3. The disc driving spindle motor according to