To reduce the starting current a three-phase squirrel-cage, Electrical Engineering

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To reduce the starting current a three-phase squirrel-cage

a. A three-phase, 220-V, 60-Hz induction motor runs at 1,140 rev/min. Determine the number of poles (for minimum slip), the slip, and the frequency of the rotor currents.

b. To reduce the starting current, a three-phase squirrel-cage induction motor is started by reducing the line voltage to Vs/2. By what factor are the starting torque and the starting current reduced?

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Electrical Engineering: To reduce the starting current a three-phase squirrel-cage

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Electrical Engineering: To reduce the starting current a three-phase squirrel-cage

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