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 of the rotor and the surface of the housing, with the face clearance variable in magnitude;
• coupling an electric motor with the rotor;
• coupling power electronics with the electric motor;
• determining, based on the face clearance, target performance characteristics of the pump,
• 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;
• selecting the first thermal expansion characteristic and the second thermal expansion characteristic to minimize size of the electric motor;
• and
• delivering, by the first thermal expansion characteristic and the second thermal expansion characteristic, the target performance characteristics of the pump system.

A pump comprising:

• a housing defining a surface;
• a rotor defining a face, with a face clearance defined between the face of the rotor and the surface of the housing, the face clearance variable in magnitude and determinative of target performance characteristics of the pump;
• an electric motor coupled with the rotor;
• and
• power electronics coupled with the electric motor,
• 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 are selected to minimize size of the electric motor,
• 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 under increasing temperature.