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Unbalance Detection in Flexible Rotor Using Bridge Configured Winding Based Induction Motor

An eccentric rotor position produces unbalance in the field and generates a net radial force called unbalance magnetic pull (UMP). The magnitude and direction of this UMP mainly depends on the degree and type of the eccentricity. The electromechanical interaction in an induction machine is due to the coupling between magnetic fields and the eccentricity in the rotor motion and both radial and tangential electromagnetic forces are generated in the air gaps due to this interaction. This paper investigates a specialized winding scheme for a three-phase, four-pole induction machine called a bridge-configured winding (BCW) which can be used for generating a controllable transverse force and also can be used for monitoring the health of a machine. This paper addresses the latter one where unbalance can be detected in the system due to the currents generated in the bridges. These currents are called bridge currents. In this way the bridge current can be used as a measure of the unbalance present in the rotor. To develop the experimental setup the stator winding of a 37kW three phase four-pole induction machine was modified by incorporating a bridge-configured winding. Existing rotor of the motor has been replaced with a longer rotor and a perforated disc is inserted in the rotor to introduce different unbalance. Experiments were carried out to check the presence of bridge current which is an indication of an unbalance present in the system and it has been also shown that the bridge current changes with the unbalance present in the system. Keywords—Induction machine; Bridge configured winding connection;