Polygonal liner for electrical submersible pump canned motor

A method for producing hydrocarbons from a subterranean well, the method including:

• forming a rotor assembly by positioning an intermediate rotor bearing assembly and a rotor member onto a rotor shaft so that the rotor member and the intermediate rotor bearing assembly circumscribe the rotor shaft, where the rotor shaft is an elongated member;
• pulling the rotor assembly into an interior cavity of a stator body within a motor housing, the motor housing being an elongated member and the stator body being part of a stator, where the rotor shaft extends along a central axis of the stator, where a liner is located along an interior surface of the interior cavity, the liner being a thin walled member that is secured to the motor housing and sealing the stator body from a wellbore fluid, the liner located along the interior surface of the interior cavity having a polygonal cross section perpendicular to the central axis, and where the motor housing, the stator, the rotor assembly, and the liner form a motor;
• forming an electrical submersible pump assembly with the motor, a seal section, and a pump;
• lowering the electrical submersible pump assembly into the subterranean well with a deployment string;
• operating the electrical submersible pump assembly to lift production the wellbore fluids in a direction out of the subterranean well;
• where
• the intermediate rotor bearing assembly is a ring shaped member with an outer diameter surface, the outer diameter surface having a polygonal shaped outer series of edges that corresponds to the polygonal cross section of the liner;
• and
• an interaction of the outer series of edges of the intermediate rotor bearing assembly and the inner diameter surface of the liner results in the intermediate rotor bearing assembly being rotationally static relative to the stator while the rotor shaft rotates relative to the intermediate rotor bearing assembly.