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A three-phase, 220-V, 60-Hz, four-pole, wye connected induction motor has a per-phase stator resistance of 0.5 . The following no-load and blocked rotor test data on the motor are given:
• No-load test: line-to-line voltage 220 V, total input power 600 W, of which 200 W is the friction and windage loss, and line current 3 A
• Blocked-rotor test: line-to-line voltage 35 V, total input power 720W, and line current 15 A
(a) Calculate the parameters of the equivalent circuit.
(b) Compute the output power, output torque, and ef?ciency if the machine runs as a motor with a slip of 0.05.
(c) Determine the slip at which maximum torque is developed, and obtain the value of the maximum torque.
What are the three modes of operation of rotating machines
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