Single thrust magnetically biased fully recirculating self purging fluid dynamic bearing motor

A disc drive motor comprising:

• a stationary assembly comprising a sleeve;
• a rotating assembly comprising a shaft and a hub supported for rotation within the sleeve;
• a fluid dynamic bearing established in a gap between the shaft and the sleeve;
• a radial capillary seal defined proximate a first end of the gap;
• at least one re-circulation path extending from the radial capillary seal toward a second end of the gap near an end of the shaft;
• a magnet assembly supported by the rotating assembly;
• a stator supported by the stationary assembly that cooperates with the magnet assembly to induce rotation of the rotating assembly;
• wherein the fluid dynamic bearing includes a journal bearing, defined in an interfacial region between the shaft and the sleeve for establishing fluid flow through the fluid dynamic bearing;
• a counterplate supported from the sleeve and having a surface facing an end surface of the shaft, one of counterplate surface and the shaft end surface having a groove pattern thereon to establish a thrust bearing in the gap between the shaft end surface and the counterplate surface, wherein the groove pattern pumps fluid radially inward toward a central axis of the shaft;
• and
• a ring clip supported in a groove of the shaft, the groove being of sufficient depth to allow the ring clip to be displaced therein, the ring clip extending beneath a axially facing shoulder of the sleeve to act as a shock displacement limiter in the axial direction for the shaft relative to the sleeve.