Question

A three-phase, two-pole, 35 hp, 480 V, 60 Hz, Y-connected induction motor has the following constants in ohms per phase referred to the stator: Rp = 0.3220 Xm 12.50 Rz = 0.196 Ω Xi = 0.6750 Ω Xz = 0.510 Ω The total rotational losses are 1850 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 3% at the rated voltage and rated frequency, determine the following: (a) The speed in rpm and in rad/s (b) The stator current (c) The power factor (d) The developed power and output power (e) The developed torque and output torque (f) The efficiency:

          A three-phase, two-pole, 35 hp, 480 V, 60 Hz, Y-connected induction motor has the following constants in ohms per phase referred to the stator:
Rp = 0.3220 Xm 12.50
Rz = 0.196 Ω
Xi = 0.6750 Ω
Xz = 0.510 Ω
The total rotational losses are 1850 W and are assumed to be constant. The core loss is lumped in with the rotational losses. For a rotor slip of 3% at the rated voltage and rated frequency, determine the following: (a) The speed in rpm and in rad/s (b) The stator current (c) The power factor (d) The developed power and output power (e) The developed torque and output torque (f) The efficiency:

Added by Nathaniel G.

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