Patent ID: 8291574

Claim:
A method for attaching permanent magnet segments into an operative array on a rotor for a brushless direct current (BLDC) electric motor assembly of the type used in liquid fuel pumps, said method comprising the steps of: providing a rotary shaft having a hub section with an outer surface; providing a plurality of permanent magnet segments, each magnet segment having opposing ends; supporting the magnet segments in an operative position on the outer surface of the hub section; said step of supporting the magnet segments including arranging the magnet segments side-by-side in equal arcuate increments around the outer surface of the hub; fabricating an annular ring from an electrically conductive material; loosely encircling at least one end of the magnet segments with the ring; and shrinking the ring by inducing therein a current flow using a high energy pulsed magnetic field to squeeze each magnet segment into pressing engagement against the outer surface of the hub and collectively hold the magnet segments in the operative position upon the rotary shaft.