Why high power supply voltage will damage the winding of the liming motor?

Update:20 Jul 2020
Summary:

If the power supply voltage is too high, the excitation […]

If the power supply voltage is too high, the excitation current will increase, and the liming motor will overheat. Excessive high voltage will threaten the insulation of the liming motor and cause it to be broken down. When the power supply voltage is too low, the electromagnetic torque will be greatly reduced. If the load torque is not reduced and the rotor speed is too low, the slip rate will increase and the liming motor will become overloaded and generate heat, which will affect the life of the liming motor for a long time. .

When the three-phase voltage is asymmetrical, that is, when the voltage of one phase is too high or too low, it will cause a certain phase current to be too large, the motor heats up, and at the same time the torque decreases will make a "wong buzzing" sound, which will damage the winding for a long time. In short, no matter the voltage is too high or low or the three-phase voltage is asymmetry, the current will increase and the motor will generate heat and damage the liming motor. Therefore, according to the national standard liming motor power supply voltage changes within ±5% of the rated value, and the motor output power maintains the rated value. The motor power supply voltage is not allowed to exceed ±10% of the rated value; the difference between the three-phase power supply voltage should not exceed ±5% of the rated value.