Experimental verification of performance of single phase induction motor for different rotor slot shapes

Abstract

This study investigates the effect of rotor slot design and the improvement to performance and efficiency in the run capacitor single phase induction motor used in refrigerator compressor. The study considers the effect of deep and double cage rotor slot design on performance and compares this with the original motor design using finite element analysis. Rotors with deep and double cage slot structure were manufactured as prototypes and tested in the same stator. The reliability of the model was confirmed by the experimental measurements and finite element analysis solutions. The efficiency of the motor was increased by 4.1% with the double cage rotor and 1.95% with the deep slot structure with improvements in rotor slot geometry. The best performance from the double cage rotor induction motors was output power 125 W, torque 0.42 Nm, speed 2932 rpm, power factor 0.94, and 77% efficiency.