In an induction motor r2' is the rotor resistance. What is the resistance representing mechanical output in the equivalent circuit of an induction motor as referred to stator side?
- A. r2'(1/s - 1)
- B. r2'^2 / s
- C. r2'^2 (1/s - 1)
- D. r2' / s
Answer: A. r2'(1/s - 1)
Explanation: In the per-phase equivalent circuit of an induction motor, total power transferred across the air gap is I2'²(r2'/s); the mechanical power developed is modeled by resistance RL' = r2'(1/s − 1).