Fluid Pump With Indirectly Cooled Sortor

A fluid pump comprising:

• a pump casing that includes a pump housing and a motor pot;
• a drive casing that houses control electronics;
• an impeller disposed in the pump housing;
• and
• a motor that drives the impeller,
• wherein,
• the pump housing has a concave shape that includes a housing closed end and a housing open end opposite the housing closed end,
• the pump housing defines a pump inlet and a pump outlet,
• an inner surface of the pump housing includes a volute that directs fluid toward the pump outlet,
• the motor pot has a concave shape that includes a pot closed end and a pot open end opposite the pot closed end,
• the motor pot includes a pot sidewall that extends between the pot open end and the pot closed end, the pot open end is assembled with the housing open end so as to define a pump wet space between the motor pot and the pump housing,
• the motor includes
• a stator disposed in the pump housing in a dry area defined between the housing sidewall and the pot sidewall, the stator surrounding the pot sidewall;
• and
• a rotor disposed in the motor pot so as to reside in the wet space and be surrounded by the stator, the rotor being connected to the impeller,
• the motor is configured so that the rotor is rotatable relative to the stator,
• the motor pot includes a first flange that protrudes radially outward from the pot sidewall, the first flange encircling the pot open end,
• a peripheral portion of the first flange is fixed relative to the pump casing,
• an inner portion of the first flange is radially disposed between the peripheral portion and the pot sidewall, and
• a stator-facing surface of the inner portion of the first flange defines a plurality of first concavities.