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Operation of three-phase induction motor on a single supply

If one line of a three-phase line is accidentally opened while the three-phase motor is running the machine will continue to run as single-phase motor.

The current drawn from the remaining two lines will almost double, and the motor will begin to overheat.

The torque-speed curve is seriously affected when a three-phase motor operates on single phase.

The pull-out torque (maximum torque) decreases to about 40% of its original value, and the motor develops no starting torque at all.

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Tags: Engineering, induction-motor, operation, power-supply, three-phase

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