a fluid pump includes a pump housing having a housing cavity with an inlet and an outlet . an encapsulated stator assembly is positioned within the housing cavity and at least partially defines a fluid passage from the inlet to the outlet . a polymeric capsule member encloses and seals the encapsulated stator assembly , protecting the motor from , and providing heat transfer to , the working fluid . a stator provides a magnetic field which drives a rotor assembly . the rotor assembly rotates an impeller for pumping fluid from the inlet to the outlet .