Patent ID: 6467150
Filing Date: 2002-10-22
Classification: H02K,Y10T

Abstract:
A process for producing a rotor assembly of a stepping motor, comprising the ordered steps of:(a) clamping both sides of a cylindrical magnet magnetized in axial direction with a pair of rotor stacks provided with pole teeth on outer circumferences thereof and formed by laminating electrically insulated annular magnetic plates; (b) disposing a cylindrical non-magnetic sleeve within the magnet and the rotor stacks by press fitting the sleeve; (c) solidifying the magnet, the rotor stacks and the sleeve with a resin in a unitary manner; (d) directly inserting a center hole maintaining apparatus of an outer diameter grinding machine into both ends of the sleeve; (e) grinding the outer circumferences of the rotor stacks with a grinding stone of the outer diameter grinding apparatus until the outer circumferences of the rotor stacks become a predetermined outer diameter; (f) press fitting a rotary shaft having a predetermined length by each motor into the sleeve; and (g) gluing the rotary shaft to the sleeve.