Pump system and method for optimized torque requirements and volumetric efficiencies

A method comprising:

• constructing a pump with a housing defining a surface;
• assembling a rotor in the pump, with the rotor defining a face, and defining a face clearance between the face and the surface, with the face clearance variable in magnitude;
• determining, based on the face clearance, target performance characteristics of the pump system,
• selecting, for the housing, a first material having a first thermal expansion characteristic;
• selecting, for the rotor, a second material selected to have a second thermal expansion characteristic;
• and
• delivering, by the first thermal expansion characteristic and the second thermal expansion characteristic, the target performance characteristics of the pump system.

A pump system comprising:

• a housing defining a surface;
• a rotor defining a face, with a face clearance defined between the face and the surface, the face clearance variable in magnitude and determinative of target performance characteristics of the pump system;
• and
• a motor coupled with the rotor,
• wherein the housing comprises a first material selected to have a first thermal expansion characteristic,
• wherein the rotor comprises a second material selected to have a second thermal expansion characteristic,
• wherein the first thermal expansion characteristic and the second thermal expansion characteristic deliver greater expansion of the rotor as compared to the housing under increasing temperature to deliver minimized torque requirements of the motor at decreasing temperature and maximized volumetric efficiency of the pump system under increasing temperature.