Patent ID: 6443716
Filing Date: 2002-09-03
Classification: F02M

Abstract:
An electric motor-driven fuel pump comprising a disk-shaped impeller having blades in the outer circumferential edge, a pump casing assembly which rotatably supports the impeller and provides a pump flowpath with a circular arc band shape extending along the blades of the impeller and a suction port and a discharge port opened in both ends of said pump flow path, a rotor having a center shaft fitted in the center of the impeller and a core fixed in said center shaft, bearings for rotatably supporting the center shaft of the rotor, and a pair of permanent magnets concentrically provided in an outer circumference of the rotor, characterized in that the permanent magnets are placed so that a load of a direction opposite to a direction of a load applied to the impeller by a pressure distribution within the pump flow path is generated in the rotor.