Magnet assembly for electric fuel pump

摘要

A magnet assembly in an electric motor of a motor vehicle fuel pump includes a tubular ferromagnetic flux carrier closely received in a shell of the fuel pump between a pump at one end of the shell and an end housing at the other end, a pair of arc-shaped permanent magnets on the flux carrier having a non-magnetic state as formed and a magnetic state after exposure to magnetic flux, an elongated arc-shaped plastic locator between the magnets, and a spring clip opposite the locator urging the magnets into magnet pockets in the locator. The plastic locator is the same length as the flux carrier and conforms to the curvature thereof. Each magnet pocket has a pair of short lateral sides which capture the magnets in their non-magnetic state and establish the locations thereof relative the ends of the flux carrier. The plastic locator is closely received between edges of an arc-shaped boss on the end housing assembly to effect accurate angular location of carbon brushes on the end housing assembly relative to the magnets.