The Passive Vibration Control in Bridge Configured Winding Cage Rotor Induction Motor: An Experimental Analysis

In electrical systems, very small eccentricity creates an asymmetric magnetic flux distribution in the air gap. Due to the eccentricity, these additional magnetic fields exert an extra pulling force called Unbalance Magnetic Pull (UMP), which severely causes unwanted vibrations in the system. However, it is essential to mitigate the effect of the UMP in the system. This paper demonstrates the effect of the new winding-based configuration called the Bridge Configured Winding (BCW) on the squirrel cage induction motor with the help of experimental analysis. Hence, the modified system’s parameters (rotor) have been scrutinized experimentally using the impulse test and the half-power bandwidth method. The BCW is an effective winding scheme that acts as a damper winding in the squirrel cage induction motor. The experimental analysis found that the BCW induction can serve as the built-in force actuator and significantly reduces the effect of additional magnetic fields due to the P ± 1 pole pair by flowing equalizing current through the bridge winding. The modified analytical rotor dynamic model for the coupled electromechanical forces due to static eccentricity has been proposed for the BCW cage induction motor. The FFT of the experimentally measured rotor response of the modified BCW induction motor has been compared for bridge ON and bridge OFF conditions. The study shows that BCW can effectively minimize the oscillating component of the UMP due to static eccentricity.