SELF-CALIBRATING POWER FACTOR CONTROLLER FOR AC INDUCTION MOTORS

摘要

ABSTRACT OF THE DISCLOSUREA digital self-calibrating power factor controllerfor an AC induction motor. During start up a first numbercorresponding to the actual phase angle between motor voltageand current is determined and compared with a second numbercorresponding to a desired delay in energizing the motor. Thesecond number is varied until both numbers are approximatelyequal. A third number corresponding to a desired phase angleis determined and stored and the system switches from start-upto run. The first number corresponding to the actual phaseangle is now compared with the third number corresponding tothe desired phase angle. The second number corresponding toa desired delay is now varied with motor load so as to keepthe actual phase angle equal to the desired phase angle.