Patent ID: 6920683

Claim:
A process for assembling a rotor assembly having a magnet, a pair of rotor stacks, a non-magnetic sleeve, and a rotor shaft, the process comprising: (a) clamping both sides of the magnet magnetized in axial direction with the pair of rotor stacks provided with pole teeth on outer circumferences thereof and formed by laminating electrically insulated magnetic plates; (b) inserting the non-magnetic sleeve through holes in the magnet and the rotor stacks; (c) solidifying the magnet, the rotor stacks and the sleeve with a resin in a unitary manner; (d) inserting a center hole maintaining apparatus of an outer diameter grinding apparatus into ends of a hole passing through the sleeve; (e) grinding the outer circumferences of the rotor stacks with a grinding stone of the diameter grinding apparatus until the outer circumferences of the rotor stacks become a predetermined outer diameter; (f) pressing a rotary shaft having a predetermined length into the sleeve; and (g) gluing the rotary shaft to the sleeve.