Influence of auxiliary winding resonance on the harmonic behavior of single phase capacitor motors

Single phase capacitor run induction motors have long held a significant presence in the distribution system because of their use in domestic appliances such as refrigerators, air conditioners and fans. Because they are so widespread in number, their characteristics and response towards harmonic voltages present in single phase distribution systems are important. This paper outlines the response of these motors to harmonic voltages in some detail. It explains how the auxiliary winding circuit in these motors causes certain behaviors not normally associated with single winding run motors. This paper provides some background to understanding this behavior and then provides experimental demonstration for the peculiar phenomena that occur when the motor is subjected to a source voltage containing harmonics.