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 |