The electric motor design has been developed to provide the best performance at its rated voltage. When operating in the lower nominal voltage, the electric motor is more reduced sharply as the motor torque produced when there is abnormal heating of the windings and this results in energy expenditure.
When voltage is applied above the nominal, it causes the electric motor has its impaired operation and this causes electric motor has increased its losses, mainly iron.
Typically, the electric motor has a voltage range that is great to be operated, but it varies depending on the type of electric motor and also of its power.
The voltage to be applied should be discovered when the electric motor is activated when the machine is operating at full capacity and habituation. Industries that operate at low voltage, if the voltage is far below normal meant that can be caused by excessive drops in the cables that power the electric motor.