First of all, the 380V three-phase AC motor lacks one phase during the starting process. Generally speaking in textbooks, it can not be turned, the motor will only buzz, then in the end, can the three-phase motor turn in the absence of one phase? Friends who want to know follow Dalan Motors.
In fact, in actual work, as long as the motor is not too large, and it is still light or no load, individual motors can be turned up in the absence of phase. It's just that the speed is slightly lower and the current is large. But most motors can't turn without a phase.
If two phases are missing during start-up, the motor will not turn under any circumstances. Another situation is the lack of phases during operation. If a three-phase AC 380 volt motor suddenly lacks one phase during operation. The motor generally does not stop. Unless it is a particularly large load. At this time, the current of the motor will be too large, and the vibration will be relatively large. And accompanied by abnormal sounds. The current is also relatively large.
It is worth mentioning that it is very dangerous to run a three-phase 380 volt motor without one phase. If it is not found in time, it will easily burn the motor. When the small motor is started, the phase is missing. If there is no load, it will rotate slowly and unevenly. At the same time, it will heat up. If it does not stop in time, it will burn out in a long time. If the bigger motor starts without a phase, it will buzz and scream, and you have to stop quickly, otherwise it will burn out immediately.
If the motor lacks phase during operation, the motor will also emit abnormal sounds, and the motor will continue to run due to inertia. If it is not stopped immediately, the winding of the motor will be burned out. More current to generate enough torque, so the current is larger, when the load is larger, the motor will be overloaded, and the motor will be burned over a long time.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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