Patent ID: 6961213

Claim:
A motor, comprising: a housing having a central axis; a stationary member that is fixed with respect to the housing and coaxial with the central axis; a stator that is fixed with respect to the housing; a rotatable member that is rotatable about the central axis with respect to the stationary member; a rotor supported by the rotatable member and magnetically coupled to the stator; and a hydrodynamic bearing interconnecting the stationary member and the rotatable member, the bearing having at least one working surface comprising a low friction layer on a wear resistant layer, wherein the wear resistant layer has a thickness in a range of about 100 nanometers (nm) to about 5 micrometers (μm) and the low friction layer has a thickness in a range of about 5 nanometers (nm) to about 50 nanometers (nm).