Electric motor-integrated rocket engine pump

An electric motor-integrated rocket engine pump comprising:

• a housing;
• a rotating body provided in a first direction inside the housing;
• an electric motor provided inside the housing and integrally shaft-coupled to the rotating body;
• and
• a plurality of fluid bearings mounted on the rotating body to support rotation of the rotating body,
• wherein the rotating body includes:
• a center shaft extending in the first direction;
• a permanent magnet provided in a circumferential direction on an outer circumferential surface of the center shaft;
• a journal for encasing the center shaft in a longitudinal direction;
• and
• an impeller connected to a front end of the journal in the longitudinal direction, and provided on a portion of the outer circumferential surface of the center shaft protruding from the front end of the journal in the longitudinal direction,
• wherein the rotating body further includes:
• a first side cap and a second side cap for capping longitudinally both ends of the permanent magnet respectively;
• an inducer connected to a front end of the impeller and provided on a portion of the outer circumferential surface of the center shaft that is protruding from the front end of the impeller;
• and
• a nut fastened to the portion of the outer circumferential surface of a front end of the center shaft in the longitudinal direction at a front of the inducer, and
• wherein the center shaft, the permanent magnet, the journal, the impeller, the first side cap, the second side cap, and the inducer, which are temporarily coupled to each other, are integrally assembled by the nut.