Bearing apparatuses, systems including same, and related methods

A motor assembly for use in drilling subterranean formations, the motor assembly comprising:

• a motor configured to apply a torque to a rotary drill bit, the motor operably coupled to a radial bearing apparatus;
• wherein the radial bearing apparatus comprises:
• a rotor including at least one bearing element associated therewith, the at least one bearing element defining a rotor bearing surface;
• a stator including at least one bearing element associated therewith, the at least one bearing element defining a stator bearing surface;
• at least one biasing element configured to allow for a selected magnitude of elastic axial displacement of at least one selected bearing element, the at least one selected bearing element comprising at least one of:
• the at least one bearing element associated with the stator;
• the at least one bearing element associated with the rotor;
• wherein the at least one selected bearing element comprises a polycrystalline diamond table formed on a substrate, at least a portion of the substrate being disposed within at least one recess formed in its associated stator or rotor;
• wherein the rotor bearing surface and the stator bearing surface are structured to slidingly engage each other;
• wherein the selected bearing element is displaceable within the at least one recess of its associated stator or rotor in response to engagement between the rotor bearing surface and the stator bearing surface.