TRANSIENT ANALYSIS OF THE SQUIRREL CAGE INDUCTION MOTOR

Abstract

This research paper provides a comprehensive electromagnetic transient analysis of the squirrel cage induction motor (IM), using the finite element analysis (FEA) method. The dynamic behavior of the squirrel cage IMs under various operational conditions, including startup, rated load, and fault scenarios, are considered and computed using the 2D FEA. Although, the steady state electromagnetic analysis by the corresponding author evaluates the squirrel cage IM’s performance at different rotor positions, supplied voltages, rotor slips, and at different operating conditions of the no-load and the blocked-rotor cases [Syed, Q.A.S., et. al. 2025], it fails in evaluating the dynamic responses influenced by magnetic field harmonics and rotor motion, which are critical for accurate motor design and performance prediction. To overcome the limitations of steady-state electromagnetic analysis, parameters such as electromagnetic torque, phase currents, and speed during dynamic conditions of the squirrel cage IM are determined by using the transient electromagnetic analysis. The squirrel cage IM’s dynamic behavior is simulated using the 2D FEA to analyze its electromagnetic behavior from a no-load startup, through the application of rated drag torque, and finally under fault conditions, such as a single-phase short-circuit. The time-evolved quantities, such as, current, electromagnetic torque, and speed are observed and analyzed, during these three dynamic conditions of no-load startup, rated load and under fault conditions. The framework for predicting the transient performance of squirrel cage IM is offered, offering insights into their stability and response characteristics under dynamic and fault conditions.