What happens if a 3 phase motor loses a phase?

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If a three-phase motor is operating and loses one of the phases, the motor will continue to operate at a reduced speed and experience vibrations. The current will also increase considerably in the remaining phases, causing an internal heating of the motor components. If the motor is not disconnected quickly, it will break down as a result of this increase in temperature.

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Author: https://www.nassarelectronics.com/en/whats-a-phase-failure-single-phasing-phase-failure-is-a-very-common-electrical-fault-experienced-by-three-phase-motors/