Method for manufacturing rotor

Abstract

An exemplary method for manufacturing a rotor is disclosed. A fixture is firstly made. The fixture includes a base, a column extending upwardly from the base, and an annular protrusion extending upwardly from the column. A slot is defined in the column. A shaft is inserted in the slot. A hub is made and disposed on a top face of the annular protrusion. The hub includes a cover and a sidewall extending downwardly from the cover. The shaft contacts a center of the cover. A laser beam is used to illuminate the center of the cover to thereby weld the shaft with the cover.

What is claimed is: 
     
         1 . A method for manufacturing a rotor, comprising:
 making a fixture defining a slot therein;   disposing a shaft in the slot of the fixture;   making and disposing a hub on the fixture such that the shaft contacts a central area of the hub;   welding the shaft to the central area of the hub by a laser beam.   
     
     
         2 . The method of  claim 1 , wherein the hub comprises a cover and the hub is disposed on the fixture such that the cover contacts a top face of the fixture. 
     
     
         3 . The method of  claim 2 , wherein the hub comprises a sidewall and the hub is disposed on the fixture such that the sidewall surrounds an outer circumferential face of the fixture. 
     
     
         4 . The method of  claim 3 , wherein the sidewall extends downwardly and perpendicularly from the cover. 
     
     
         5 . The method of  claim 3 , wherein the cover comprises a disk spaced from the sidewall. 
     
     
         6 . The method of  claim 5 , wherein the cover comprises a ring extending downwardly from a circumferential periphery of the disk, and a flange extending outwardly from the ring, the sidewall connecting the flange. 
     
     
         7 . The method of  claim 6 , wherein the disk is parallel to the flange and located higher than the flange. 
     
     
         8 . The method of  claim 6 , wherein the fixture comprises a column and an annular protrusion extending upwardly from a top face of the column, and the hub is disposed on the fixture such that the disk of the hub is disposed on a top face of the annular protrusion. 
     
     
         9 . The method of  claim 8 , wherein the sidewall of the hub contacts an outer circumferential face of the column of the fixture. 
     
     
         10 . The method of  claim 8 , wherein the hub is disposed on the fixture such that the flange of the cover is located above the top face of the column with an air gap between a bottom face of the flange and the top face of the column. 
     
     
         11 . The method of  claim 8 , wherein the fixture further comprises a base supporting the column thereon, and the base has a diameter larger than a diameter of the column. 
     
     
         12 . The method of  claim 11 , wherein the base has a height less than a height of the column. 
     
     
         13 . The method of  claim 8 , wherein the annular protrusion has an outer diameter less than the diameter of the column, and a height less than a height of the column. 
     
     
         14 . The method of  claim 8 , wherein the annular protrusion surrounds a cavity therein, and the slot is defined in a bottom of the cavity. 
     
     
         15 . The method of  claim 8 , wherein a top face of the shaft is leveled with the top face of the annular protrusion of the fixture during the step of disposing the shaft in the slot of the fixture. 
     
     
         16 . The method of  claim 5 , wherein a top face of the shaft is in contacting with a center of a bottom face of the disk of the hub during the step of disposing the hub on the fixture. 
     
     
         17 . The method of  claim 5 , wherein the hub defines a through hole at a center of the disk, and the shaft is inserted to the through hole during the step of disposing the hub on the fixture. 
     
     
         18 . The method of  claim 17 , wherein the hub is disposed on the fixture such that a top face of the shaft is leveled with a top face of the disk. 
     
     
         19 . The method of  claim 17 , wherein the shaft is welded to the hub such that a circumferential face of the shaft is fixed to an inner circumferential face of the through hole of the hub.