Motor load controller for AC induction motors

Abstract

This invention is an improved energy-saving method and apparatus for attaining and maintaining optimum operational efficiency in single-phase or three-phase alternating current (AC) induction motors that are operating under varying loads.

I claim:  
     
         1 . An improvement in an energy-saving method for optimizing operational efficiency of single and three-phase alternating current induction motors when such motors are operating under varying loads such improvement in combination comprising the steps of: 
 continually monitoring and detecting true voltampere reactive power; and    continually issuing signals in order to adjust and control input line voltage as long as true voltampere reactive power is detected so that input line voltage is now optimally a function of load.    
     
     
         2 . An improvement in an energy-saving apparatus for optimizing operational efficiency of single and three-phase alternating current induction motors when such motors are operating under varying loads such improvement in combination comprising: 
 means for monitoring and detecting true voltampere reactive power; and    means for continually issuing signals in order to adjust and control input line voltage as long as true voltampere reactive power is detected so that input line voltage is now optimally a function of load.