How the parameters of three phase motors change when there are voltage fluctuation at stable frequency?
In a three phase motor starting and maximum torque change – more or less – with the square of the voltage variation rapport while the input current change with the same rapport. If the deviation of the supply voltage respect the nominal voltage value remain within the tolerances allowed, motor will continue to give the nominal power. The overheating of the motor can be exceeded by 10°C. If the frequency variation is inside the ± 5% of nominal frequency, motor continue to give the nominal power while speed change in the same rapport with the frequency variation.
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