Disc drive system for reading or writing data memory - has pancake type motor construction built-in for direct drive with rotor supported on inner and outer ball bearing assemblies

摘要

A direct drive system for use with disc drives has a stator (2) and a rotor (20) with a central spigot (22) and flange (26) that serves as a location for the disc. The rotor has a central stem (21) and a disc (28). The stator has an insert (8) that supports the stator windings (14). The rotor is supported on inner (40) and outer (50) ball bearings. The outer (44, 54) bearing races are fixed to the stator assembly, while the other races rotate with the rotor assembly. ADVANTAGE - Small axial length. Increased bearing stiffness for error-free reading or writing.