The formula to calculate the Efficiency is:
\[ \eta = \frac{\tan(\psi)}{\tan(\psi + \Phi)} \]
The Efficiency of an electric motor is defined as the ratio of usable shaft power to electric input power.
Let's assume the following values:
Using the formula:
\[ \eta = \frac{\tan(0.4363323129985)}{\tan(0.4363323129985 + 0.21816615649925)} = 0.607703971657782 \]
| Helix Angle (ψ) | Limiting Angle of Friction (Φ) | Efficiency (η) |
|---|---|---|
| 0.4 rad | 0.21816615649925 rad | 0.594525356681 |
| 0.41 rad | 0.21816615649925 rad | 0.598410260339 |
| 0.42 rad | 0.21816615649925 rad | 0.602095435412 |
| 0.43 rad | 0.21816615649925 rad | 0.605588368012 |
| 0.44 rad | 0.21816615649925 rad | 0.608896016735 |
| 0.45 rad | 0.21816615649925 rad | 0.612024849114 |
| 0.46 rad | 0.21816615649925 rad | 0.614980874680 |
| 0.47 rad | 0.21816615649925 rad | 0.617769674964 |
| 0.48 rad | 0.21816615649925 rad | 0.620396430740 |
| 0.49 rad | 0.21816615649925 rad | 0.622865946756 |