The 220 volts is obtained by taking the sq. root of 3 which equals 1.73 and dividing it into the phase voltage. 380/1.73 = 220 volts. This holds true with any three phase four wire voltage system In this video, I try to explain to you what you have to do to run such motor from a single phase. When you don’t give a motor full voltage, it produces less torque, less at the square of the voltage reduction. So 480/575 = roughly 83%, so your peak torque capability will be reduced to about 70% of normal. Since synchronous speed remains the same, you HP becomes 70% as well. If your motor was over sized by 30% or more it will be fine. Motors work based upon a V/Hz ratio. Motors for use in the US are designed around our utility voltage of 480V 60Hz, so 460/60=7.6V/Hz. Your motor is designed around 380V 50Hz, and 380/50=7.6V/Hz! As countryman said, you motor will run faster no matter what, but you don't necessarily need to buy a transformer. GBShade684 said: If the motor is rated 480Vac at the nameplate FLA, when you run 240Vac you will double the running amperage. The windings won't / aren't designed to handle the heat that will build up. Motor will burnup and / or catch on fire. How long it takes depends on the robustness of the motor. BG or BGE Brake Rectifier. Motor wired for high voltage. Brake voltage matches high motor voltage. Example: 220/380V Motor Motor wired 380V Brake voltage 380V. The BG Brake Rectifier - Standard for frame sizes up to 100, not available on frame sizes above 100. The brake rectifier BG is a half-wave rectifier with overvoltage protection. However, when you use it at a higher voltage than it was designed for, the motor windings saturate and the motor consumes more energy as heat, so the current is higher at the higher voltages. For 60Hz applications, the V/Hz ratio of the design, 380/50, is 7.6:1, which is almost exactly the same as 460V 60Hz, so the motor is fine with 460V 60Hz As said before, this must be 230/400v motor connected at Wye, so each winding received 277v. I assume the 480v is 60Hz and the rated 230v is 50Hz. If my assumptions are correct, there is no problem with the flux of the motor as 480/60 equals to 400/50. On the other hand, the motor rotates 20% faster than rated. Can you run 480V motor on a 380V system Have is 480v 60hz 3 phase equipment and moving to a country with 380V 50HZ power supply? Updated: 8/10/2023. Wiki User. ∙ 12y ago. Study now. nKHIfX.

can you run a 380v motor on 480v