Posted 05 April 2006 - 08:48 AM
Posted 05 April 2006 - 09:14 AM
Welcome to the forum.
Operating 460 volt motors on 440 volts will result in a higher current for the rated shaft torque. The power into the motor will increase by a small amount due to the increase in copper loss in the stator. There will also be a small reduction in iron loss due to the reduction in flux, but the copper loss increase would be higher than the iorn loss decrease.
The increase in current will be in the order of 5%, so the increase in copper loss will be 1.05 x 1.05 = 1.1025 or a 10% increase in copper loss. The opper loss on a 100HP motor is pretty small, could be in the order of 5% of the motor rating, so the copper loss may increase to somewhere in the order of 5.5% of the motor rating.
This change in energy usage is very small.
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