Rotor material type | Relative magnetic permeability (μr) | Open loop phase voltage (Vrms) |
Steel (soft iron) | ~4600 | 130.7 V |
Stainless steel 304 | 1 | 91.34 V |
Stainless steel 416 | ~750 | 128.3 V |
Silicon steel | ~3500 | 129.8 V |
Electrical steel M19 | ~3700 | 130.2 V |
Mild steel (1020 plain carbon steel) | ~1000 | 128.5 V |