If the three-phase power supply is connected to a load and one phase of the input is missing under full load conditions, how will the voltage after the rectifier bridge change?

西里古1992

If the three-phase power supply is connected to a load and one phase of the input is missing under full load conditions, how will the voltage after the rectifier bridge change? [Copy link]

The connected load is a star-connected motor, how does the motor output change?

maychang

Three-phase power supply connected to load, the load is a star-connected motor, and there is rectification? Not likely. Is your motor an AC motor or a DC motor?

qwqwqw2088

It is connected to a rectifier bridge and a star-connected motor

I don't know what I received

anyway,

三相中的任一相缺失时，整流电路将不能正常工作为全波整流，
转为单相半波或某种形式的不完全整流，
取决于缺失的是哪一相以及电路的具体接法。
这种情况下，输出的直流电压和电流的有效值都会显著下降。

qwqwqw2088

The star-connected motor is probably an AC motor.

A missing phase will cause the current flowing through the motor to be unbalanced, and the remaining two phases will have to bear a larger current, which may cause the motor to become very hot and stop.

振动试验仪器

If one phase of the three-phase motor power supply is missing and only two phases are connected to the motor, the motor will make a buzzing sound and the output torque will be very small, that is, the motor will be blocked, and the motor will heat up and burn out in less than 30 seconds. Therefore, if the motor is missing a phase or makes a loud noise when starting, it should be stopped immediately.

振动试验仪器

The three-phase rectifier bridge outputs DC voltage. When one phase of the power supply is missing, it can still output DC voltage, but the output DC voltage value will decrease and the output ripple will increase. When the output voltage has a reduced load capacity, the system noise will increase a lot.