Reductions in weight and manufacturing costs have turned out to be supplementary benefits of optimization for the copper rotor.
Material mass comparison of motors optimized for same EPACT electrical efficiency.
| Rotor conductor | Al | Cu |
|---|---|---|
| Stator + rotor steel final kg / starting kg |
34.5 / 45.9 | 27 / 35.9 |
| Stator winding kg | 7.3 | 4.4 |
| Rotor cage kg | 2.0 | 3.6 |
| Total copper kg | 7.3 | 8.0 |
| 7.5 / 10 kg less steel 0.7 kg more copper | ||
| Rotor conductor | Al | Cu |
|---|---|---|
| Stator + rotor steel final kg / starting kg |
54.5 / 72.7 | 43 / 57.3 |
| Stator winding kg | 10.2 | 8.7 |
| Rotor cage kg | 3.0 | 5.9 |
| Total copper kg | 10.2 | 14.6 |
| 11.5 / 15 kg less steel 4.4 kg more copper | ||