| Patent Number |
Title Of Patent |
Date Issued |
| 6700295 |
Rotor of electric motor and manufacturing method thereof |
March 2, 2004 |
| A rotor core includes a plurality of first core sheets and a plurality of second core sheets. The first core sheets and the second core sheets are laminated in the axial direction of the rotor core. Each first core sheet includes a plurality of first teeth laid out in a ring form on a sa |
| 6643911 |
Method of manufacturing yoke through multistage-drawing process |
November 11, 2003 |
| A plate material is drawn to form a first-drawing product in the shape of an elliptically cylindrical container having an elliptical cross section. Then, the first-drawing product is drawn to form a re-drawing product in the shape of a generally circular cylindrical container. Next, the |
| 6568064 |
Method of manufacturing motor yoke |
May 27, 2003 |
| In a method of manufacturing a partly flat yoke having curved circumferential walls to which magnets are to be attached and having parallel flat circumferential walls which constitute main magnetic paths and whose each radial thickness is larger than that of the curved circumferentia |
