A 460V, 25 hp [1 hp = 746 watts], 60 Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.6412, R₂=0.33202, X₁ = 1.106 2, X2=0.464 Q2, XM = 26.3 2. The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, calculate the: (a) motor speed. (b) stator current. (c) power factor. (d) converted power PCON. (e) power output POUT. (f) induced torque and the load torque. (g) motor efficiency.

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A 460V, 25 hp [1 hp = 746 watts], 60 Hz, four-pole, Y-connected induction motor has the
following impedances in ohms per phase referred to the stator circuit: R₁ = 0.6412, R₂ = 0.33202,
X₁ = 1.106 92, X2=0.464 92, XM = 26.3 2. The total rotational losses are 1100 W and are assumed
to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent
at the rated voltage and rated frequency, calculate the:
(a)
motor speed.
(b)
stator current.
(c) power factor.
(d) converted power PCON.
(e) power output POUT.
(f) induced torque and the load torque.
(g) motor efficiency.
Transcribed Image Text:A 460V, 25 hp [1 hp = 746 watts], 60 Hz, four-pole, Y-connected induction motor has the following impedances in ohms per phase referred to the stator circuit: R₁ = 0.6412, R₂ = 0.33202, X₁ = 1.106 92, X2=0.464 92, XM = 26.3 2. The total rotational losses are 1100 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 2.2 percent at the rated voltage and rated frequency, calculate the: (a) motor speed. (b) stator current. (c) power factor. (d) converted power PCON. (e) power output POUT. (f) induced torque and the load torque. (g) motor efficiency.
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