Voltage Unbalance

United States National Electrical Manufacturers Association defines the voltage unbalance as 100 times the absolute value of the maximum deviation of the line voltage from the average voltage on a three phase system, divided by the average voltage. It is recommended that the voltage unbalance at the motor terminals does not exceed 1%. When the voltage unbalance exceeds the 1%, most manufacturers' void their warranties.
Because the voltage unbalance is caused by none uniform load of three phase system, end users, if fact, can do almost nothing to protect their motors. The end users can use costly devices correcting the voltage unbalance, however they do not protect each motor. They can also use overpowered motors safely running when the voltage is unbalanced. However when the voltage is balanced, these motors are running without their maximum efficiency and the users are paying additional costs.

The AMM Technologies successfully proceeding with research and development of electric motors resistant to voltage unbalance up to 3%.

Further Research.

Our further research and development are focussed on axial, disk and modular motors and generators