| 摘要 |
<p>A rotor assembly for an electric motor comprises rotor elements formed integrally as a pressing from strip steel, whereof adjacent rotor elements (8) comprise pole portions (12) which are mutually offset, particularly with respect to a central plane B-B of the body portion (10) of the rotor element. In particular each rotor element is produced by the use of a die assembly to punch the rotor element from strip material, part at least of the pole portion of the rotor element being produced by a first die member 24a, 24b, and part at least of the body portion being produced by a second die member 34a, 34b, in which relative movement is effected between the first and second die members between successive punching operations.</p> |
