Patent ID: 7752736
Filing Date: 2010-07-13
Classification: H02K,Y10T

Abstract:
1. A method of providing axially alternating N and S poles in a portion of an axially extending, cylindrical, smooth shaft for a linear stepper motor, comprising: (a) providing a magnetizing fixture comprising: a hollow cylindrical mandrel formed from a nonmagnetic material; a single conductive wire serially disposed in parallel, circumferential channels defined in an outer surface of said mandrel; a potting compound surrounding said mandrel to secure said single conductive wire in place; and a central bore defined axially and centrally through said mandrel and exposing or nearly exposing said conductive wire; and said central bore being sized to accept axially inserted therein said portion of said axially extending, cylindrical, smooth shaft; (b) inserting said portion of said axially extending, cylindrical shaft in said central bore; and (c) providing a direct current through said single conductive wire to magnetize alternating N and S poles along the portion of the axially extending cylindrical shaft.