US Patent:
20070247103, Oct 25, 2007
Inventors:
John Lottman Shudde - San Antonio TX, US
Igmar Avendano - Austin TX, US
International Classification:
H02P 27/04
Abstract:
A method for controlling power supply to an induction motor is disclosed. A baseline reactive power on an induction motor during operation is initially measured. A new reactive power for offsetting the baseline reactive power is determined. Appropriate capacitance is then applied on the power lines for the induction motor in order to supply the new reactive power to the induction motor. After the appropriate capacitance has been added to the induction motor, an instant reactive power on the induction motor is measured. A determination is made whether or not the instant reactive power on the induction motor is equal to or less than the new reactive power. If the instant reactive power is equal to or less than the new reactive power, the instant reactive power on the induction motor is continuously measured. If the instant reactive power is greater than the new reactive power, the added capacitance is removed from the power lines, and a new baseline reactive power is obtained.