the foreign motor shows 380 volts 3 phase. I have 480 volts 3 phase
If you use a variable frequency drive to reduce the frequency to 50 Hz, the drive terminal voltage should also reduce in proportion with the frequency 480(50)/60= 400.Check the v f drive terminal voltage, if it is 400 volts only, your motor should work without overheating.
You might have a 110/220 motor in which case you would series the leads for 220 or parallel them for 110. You might have a 3 phase motor with 3 wires for the phases and one ground. You might have a motor that uses an external capacitor for starting. If there is no wiring diagram, you might try taking it to a motor repair place and they can tell tou what type it is and how to connect it. You may also have a choice of direction of rotation so figure which way you want it to run before asking. You may not have a choice either. No mater what, don't connect it by trial and error. Thats a great way to blow fuses, breakers or motors.
I don't know if a 380 volt motor will run on 480 without damage. But if you are using a vfd there should be a parameter that you can set up to limit the output voltage from the drive to 380 volts.
no, obviously the voltages are different, and 480 volts will burn it out. Also, the frequencies are different. .
A 380 volt, 50 Hz motor will run quite well on 480 volts at 60 Hz. To operate a motor on a different voltage or frequency, the ratio of voltage to frequency (V/Hz) should be the same for the new power supply as it was for the original power supply. A motor rated 380V/50Hz is designed for 380/50 = 7.6 V/Hz. At 60 Hz, the voltage should be 7.6 X 60 = 456 volts. That is only 5% below the nominal 480 volt supply. That is within the normal range of expected supply voltage variation. The speed at 60 Hz will be 20% higher than the speed at 50 Hz if the load is a fan or centrifugal pump, the 20% speed increase will result in a 44% load torque increase. That could cause a problem with the load or the motor depending on the original load requirement. If the load torque does not increase, the increased speed could still cause problems with the load. The voltage tolerance of the motor insulation can be expected to withtand the voltage increase without any problem. Re Additional Details If your frequency drive is properly adjusted, there will be no extra voltage in the circuit. The drive regulates the output voltage so that it remains proportional to the output frequency. Excess voltage would be any voltage that exceeds the rated V/Hz of the motor. Excess voltage causes saturation. That is the magnetizing current increases above the current that magnetizes the magnetic core to the maximum extent possible. Low voltage is any voltage that is below the rated V/Hz. Low voltage results in the magnetic field not being strong enough for the motor to produce rated torque. That is a simplified explanation, but I think that it presents the basic idea.
