Motor including reservoir and hub cap

1. A motor comprising:

a hub cap;

a stationary component comprising a limiter; and

a rotatable component comprising a hub and the hub cap,

wherein the hub cap is positioned atop the hub and further positioned entirely radially outside of the limiter,

wherein the limiter and a sleeve include a pump seal therebetween,

wherein the hub cap, the hub, and the limiter are positioned to form a reservoir therebetween for a lubricating oil, and

wherein a distance between the hub and the limiter lessens as the reservoir deepens.

2. The motor of claim 1 , wherein the hub cap is coupled to the hub by adhesive or an interference fit.

3. The motor of claim 1 , wherein the hub cap is further positioned to form a labyrinth seal for reducing evaporation of the lubricating oil.

4. The motor of claim 1 , wherein the hub cap is further positioned to form a gap between the hub cap and the limiter.

5. The motor of claim 4 , wherein the gap measures less than 1 mm from the hub cap to the limiter.

6. The motor of claim 1 , wherein the reservoir has a volume substantially equal to the volume of lubricating oil used for the motor.

7. An apparatus, comprising:

a sleeve;

a limiter overlying the sleeve;

a hub coupled to the sleeve; and

a hub cap overlying the hub; wherein

the hub cap is positioned entirely radially outside of the limiter,

the hub cap and the limiter form an axially extending gap therebetween,

the limiter and the sleeve include a pump seal therebetween,

the limiter and the sleeve define a first passageway substantially parallel to a journal bearing,

the limiter, the hub, and the hub cap define a fluid reservoir substantially parallel to the first passageway, and

a second passageway is substantially perpendicular to the first passageway and fluidly connects the first passageway to the fluid reservoir.

8. The apparatus of claim 7 , wherein the first passageway is positioned outside of the journal bearing.

9. The apparatus of claim 7 , wherein a distance between the hub and the limiter lessens as the fluid reservoir deepens.

10. The apparatus of claim 7 , wherein the limiter, the hub, and the hub cap further define a labyrinth seal for trapping the lubricating oil during a shock event.

11. The apparatus of claim 7 , wherein the axially extending gap measures less than 1 mm from the hub cap to the limiter.

12. The apparatus of claim 7 , further comprising a recirculation passageway through the sleeve for fluidly connecting a first axial end of the journal bearing to a second axial end of the journal bearing.

13. An apparatus, comprising:

a stationary component;

a rotatable component;

a pump seal defined by the stationary component and the rotatable component; and

a fluid dynamic bearing defined by the stationary component and the rotatable component,

wherein, in cross section,

a first channel is substantially parallel to the fluid dynamic bearing;

a second channel is substantially perpendicular to the first channel;

a fluid reservoir is substantially parallel to the first channel, and

wherein the second channel fluidly connects the fluid reservoir to the first channel; and

a gap between the stationary component and a hub cap, wherein the gap is directly above the fluid reservoir, and wherein further the hub cap is positioned entirely radially outside of a limiter.

14. The apparatus of claim 13 , wherein the fluid reservoir has a volume substantially equal to a volume of lubricating oil used for the apparatus.

15. The apparatus of claim 13 , wherein the rotatable component comprises a hub, and wherein a distance between the hub and the stationary component lessens as the fluid reservoir deepens.

16. The apparatus of claim 15 , wherein the hub cap is positioned atop the hub to form a labyrinth seal for reducing the evaporation rate of the lubricating oil.

17. The apparatus of claim 16 , wherein the gap measures less than 1 mm from the hub cap to the stationary component.

18. The apparatus of claim 13 , wherein the fluid dynamic bearing is a journal bearing, and wherein the first channel and the fluid reservoir are concentric with the journal bearing.

19. The apparatus of claim 18 , further comprising a recirculation passageway through a sleeve of the rotatable component for fluidly connecting a first axial end of the journal bearing to a second axial end of the journal bearing.

20. An apparatus, comprising:

a sleeve;

a limiter overlying the sleeve;

a hub coupled to the sleeve; and

a hub cap overlying the hub;

wherein the hub cap is positioned entirely radially outside of the limiter,

wherein the hub cap and the limiter form an axially extending gap therebetween,

wherein the limiter and the sleeve include a pump seal therebetween,

wherein the limiter and the sleeve define a cylindrical passageway and an annular passageway, each passageway being concentric with the sleeve, and

wherein the limiter, the hub, and the hub cap define a fluid reservoir fluidly connected to the cylindrical passageway by the annular passageway.

21. The apparatus of claim 20 , wherein the fluid reservoir has a volume substantially equal to a volume of lubricating oil used for the apparatus.

22. The apparatus of claim 20 , wherein a distance between the hub and the limiter lessens as the fluid reservoir deepens.

23. The apparatus of claim 20 , wherein the limiter, the hub, and the hub cap further define a labyrinth seal for trapping the lubricating oil during a shock event.

24. The apparatus of claim 20 , wherein the axially extending gap measures less than 1 mm from the hub cap to the limiter.

25. The apparatus of claim 20 , further comprising a recirculation passageway through the sleeve for fluidly connecting a first axial end of a fluid dynamic bearing to a second axial end of the fluid dynamic bearing.