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The equivalent circuit of induction motor is shown as following figure. A 400V, 60Hz, six-pole, 25hp, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit. R 1 =0.641 Ω, X 1 = 1.106Ω, X m =26.3Ω, R 2 =0.332Ω, X 2 = 0.6Ω. The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses, R C =infinity. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, find the motor’s (1) The rotor’s mechanical shaft speed is ω m =______ rad/s (2) Stator current |I 1 | ______ A (3) Power factor PF = ______ (4) P conv = ______ (5) P out = ______ (6) τ ind = ______ (7) τ load = ______ (8) Efficiency η = ______ (decimal representation)
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