The formula to calculate the Rotor Copper Loss (Pr(cu)) is:
\[ Pr(cu) = s \cdot Pin(r) \]
The Rotor Copper Loss is the value obtained by subtracting the stator copper loss from the total measured loss. Slip in an induction motor is the relative speed between the rotating magnetic flux and rotor, expressed as a percentage of synchronous speed. Rotor Input Power is the total mechanical power developed in the rotor, equal to (1-s) times the rotor input.
Let's assume the following values:
Using the formula:
\[ Pr(cu) = 0.19 \cdot 7.8 \approx 1.482 \]
The Rotor Copper Loss is approximately 1.482 Watt.
| Slip (%) | Rotor Input Power (Watt) | Rotor Copper Loss (Watt) |
|---|---|---|
| 0.1 | 7.8 | 0.780 |
| 0.2 | 7.8 | 1.560 |
| 0.3 | 7.8 | 2.340 |
| 0.4 | 7.8 | 3.120 |
| 0.5 | 7.8 | 3.900 |