Can a missing phase in a motor cause it to burn out? ?
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Could you please explain to me in simple terms why?
When a motor operates with one phase missing, its current can reach about 4 times normal levels. The thermal protection system cannot trip in time, and it also fails to reach the quick-break threshold of the air switch; as a result, the motor burns out very quickly.
There is a common saying that originally three people were doing the work, but suddenly it became two people. From a professional perspective, there is also negative sequence current and back electromotive force
In simple terms, it’s a three-phase power supply; electrical energy is converted into rotational energy. If this process is disrupted, the electrical energy turns into heat, causing the motor to overheat and get damaged quite quickly
If a motor loses one phase, it will operate with that missing phase, which can damage the motor. If the motor is connected in star configuration, only two phases are energized; if it is connected in delta configuration, only one phase is energized. Problems arise with the rotating magnetic field, the motor’s torque decreases, and the current rises sharply until the overcurrent protection trips.